Classé CDP-102 RS-232 / IP control commands

Summary

The Classe Audio CDP-102, CDP-202, CDP-300, CDP-502, and CDT-300 are disc players (CD/DVD/DVD-A) with an RS-232C automation interface. This spec covers the full ASCII command set and status message protocol documented in Classe's Automation Interface Protocol Definition (Revision 1.4, May 2007). Commands use a 4-byte address prefix (e.g. P300.) which may be omitted when uniquely connected.

Transport

protocols:
  - serial
serial:
  baud_rate: 9600
  data_bits: 8
  parity: none
  stop_bits: 1
  flow_control: none
auth:
  type: none  # inferred: no auth procedure in source

Traits

- powerable       # inferred from STBY/OPER commands
- queryable       # inferred from STAT query commands returning state
- levelable       # inferred from VOLA/MVOL+/MVOL- volume commands

Actions

# Command structure: all commands terminate with <cr><lf>.
# Address prefix "P300." may be prepended (e.g. "P300.PLAY<cr><lf>") but is optional.
# Positive ACK: "!<cr><lf>"; Negative ACK: "?<cr><lf>"

- id: open_tray
  label: Open Tray
  kind: action
  command: "OPEN<cr><lf>"
  notes: Only valid on tray loader units.
  params: []

- id: close_tray
  label: Close Tray
  kind: action
  command: "CLOSE<cr><lf>"
  notes: Only valid on tray loader units.
  params: []

- id: eject_disc
  label: Eject Disc
  kind: action
  command: "EJCT<cr><lf>"
  notes: Only valid on slot loader units.
  params: []

- id: play
  label: Play
  kind: action
  command: "PLAY<cr><lf>"
  params: []

- id: stop
  label: Stop
  kind: action
  command: "STOP<cr><lf>"
  params: []

- id: pause
  label: Pause
  kind: action
  command: "PAUS<cr><lf>"
  params: []

- id: step_frame
  label: Step Frame
  kind: action
  command: "STEP<cr><lf>"
  notes: Valid only during pause state on DVD-V disc. Advances to next video frame.
  params: []

- id: unpause
  label: Unpause (Resume)
  kind: action
  command: "UNPS<cr><lf>"
  params: []

- id: next_track
  label: Next Track/Chapter
  kind: action
  command: "NEXT<cr><lf>"
  notes: Skips to next track/chapter on disc or in program.
  params: []

- id: prev_track
  label: Previous Track/Chapter
  kind: action
  command: "PREV<cr><lf>"
  notes: Skips back to previous track/chapter on disc or in program.
  params: []

- id: next_title
  label: Next Title/Group
  kind: action
  command: "NEXT TITLE<cr><lf>"
  notes: Skips to next title or group on DVD-V or DVD-A media.
  params: []

- id: prev_title
  label: Previous Title/Group
  kind: action
  command: "PREV TITLE<cr><lf>"
  notes: Skips to previous title or group on DVD-V or DVD-A media.
  params: []

- id: seek_forward
  label: Seek Forward
  kind: action
  command: "FWD [speed]<cr><lf>"
  notes: >
    Seek forward at specified speed. Only valid if disc is currently playing.
    Speed parameter optional; defaults to 2X.
    CDDA valid speeds: 2X 4X 8X 16X.
    DVD-V/DVD-A valid speeds: 1/8 1/4 1/2 2X 4X 8X 16X 30X 60X.
    MP3/WMA/AAC valid speeds: 4X.
  params:
    - name: speed
      type: string
      description: Playback speed multiplier (optional, defaults to 2X)

- id: seek_reverse
  label: Seek Reverse
  kind: action
  command: "REV [speed]<cr><lf>"
  notes: >
    Seek reverse at specified speed. Only valid if disc is currently playing.
    Speed parameter optional; defaults to 2X.
    CDDA valid speeds: 2X 4X 8X 16X.
    DVD-V/DVD-A valid speeds: 1/8 1/4 1/2 2X 4X 8X 16X 30X 60X.
    MP3/WMA/AAC valid speeds: 4X.
  params:
    - name: speed
      type: string
      description: Playback speed multiplier (optional, defaults to 2X)

- id: slow_forward
  label: Slow Forward
  kind: action
  command: "SFWD<cr><lf>"
  notes: Slow forward at half speed. Only valid if DVD-V disc is currently playing. Repeated commands increase speed.
  params: []

- id: slow_reverse
  label: Slow Reverse
  kind: action
  command: "SREV<cr><lf>"
  notes: Slow reverse at half speed. Only valid if DVD-V disc is currently playing. Repeated commands decrease speed.
  params: []

- id: fast_forward
  label: Fast Forward
  kind: action
  command: "FFWD<cr><lf>"
  notes: Fast forward at double speed (quad speed for MP3/WMA/AAC). Only valid if DVD-V disc is playing. Repeated commands increase speed.
  params: []

- id: fast_reverse
  label: Fast Reverse
  kind: action
  command: "FREV<cr><lf>"
  notes: Fast reverse at double speed (quad speed for MP3/WMA/AAC). Only valid if DVD-V disc is playing. Repeated commands decrease speed.
  params: []

- id: speed_increase
  label: Increase Search Speed
  kind: action
  command: "SPEED+<cr><lf>"
  notes: Increases search speed. Only valid if disc is currently in search mode.
  params: []

- id: speed_decrease
  label: Decrease Search Speed
  kind: action
  command: "SPEED-<cr><lf>"
  notes: Decreases search speed. Only valid if disc is currently in search mode.
  params: []

- id: still_next
  label: Next Still Image
  kind: action
  command: "STILL+<cr><lf>"
  notes: Go to next still image. Only valid for DVD-A media.
  params: []

- id: still_prev
  label: Previous Still Image
  kind: action
  command: "STILL-<cr><lf>"
  notes: Go to previous still image. Only valid for DVD-A media.
  params: []

- id: jump_time
  label: Jump to Time
  kind: action
  command: "JUMP TIME [[hh:]mm:]ss<cr><lf>"
  notes: >
    Jump to a specific time on the disc.
    hh: hours (0-99, optional); mm: minutes (0-59, optional if hh omitted); ss: seconds (0-59).
  params:
    - name: time
      type: string
      description: "Time in [[hh:]mm:]ss format"

- id: jump_title_chapter
  label: Jump to Title/Chapter
  kind: action
  command: "JUMP [tt:]ccc<cr><lf>"
  notes: >
    Jump to a specific title/chapter or group/track.
    tt: title (DVD-V 0-99) or group (DVD-A 0-9), optional.
    ccc: chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99).
  params:
    - name: title
      type: integer
      description: Title (DVD-V 0-99) or group (DVD-A 0-9); optional
    - name: chapter_track
      type: integer
      description: Chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99)

- id: track_jump
  label: Jump to Track/Chapter
  kind: action
  command: "TRACK ccc<cr><lf>"
  notes: >
    Jump to a specific chapter or track.
    ccc: chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99).
  params:
    - name: chapter_track
      type: integer
      description: Chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99)

- id: title_jump
  label: Jump to Title/Group
  kind: action
  command: "TITLE tt<cr><lf>"
  notes: >
    Jump to a specific title or group.
    tt: title (DVD-V 0-99) or group (DVD-A 0-9).
  params:
    - name: title
      type: integer
      description: Title (DVD-V 0-99) or group (DVD-A 0-9)

- id: shuffle
  label: Shuffle Play
  kind: action
  command: "SHFL<cr><lf>"
  notes: Begins shuffle play of disc. Only valid for CDDA media. (Note: source section 3.27 incorrectly shows OPEN as the command; SHFL is the mnemonic heading.)
  params: []

- id: program_add
  label: Add Track to Program
  kind: action
  command: "PRG+<cr><lf>"
  notes: Adds current selected track to program. Only valid for CDDA media.
  params: []

- id: program_remove
  label: Remove Track from Program
  kind: action
  command: "PRG-<cr><lf>"
  notes: Removes current selected track from program. Only valid for CDDA media.
  params: []

- id: program_clear
  label: Clear Playlist
  kind: action
  command: "PCLR<cr><lf>"
  notes: Clears (empties) the current playlist. Only valid for CDDA media.
  params: []

- id: program_empty
  label: Reset Playlist to TOC
  kind: action
  command: "PEMPTY<cr><lf>"
  notes: Resets the playlist to disc's table of contents. Only valid for CDDA media.
  params: []

- id: save_program
  label: Save Program
  kind: action
  command: "SAVE<cr><lf>"
  notes: Saves the currently constructed program. Only valid for CDDA media.
  params: []

- id: jump_direct_number
  label: Jump by Direct Number (0-255)
  kind: action
  command: "ccc<cr><lf>"
  notes: >
    Jump to a specific chapter or track by entering the number directly.
    ccc: chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99).
  params:
    - name: number
      type: integer
      description: Chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99)

- id: repeat_disc
  label: Repeat Disc
  kind: action
  command: "RPDC<cr><lf>"
  notes: Engages repeat disc function.
  params: []

- id: repeat_title
  label: Repeat Title/Group
  kind: action
  command: "RPTT<cr><lf>"
  notes: Engages repeat title function on DVD-V and repeat group function on DVD-A.
  params: []

- id: repeat_track
  label: Repeat Track/Chapter
  kind: action
  command: "RPTK<cr><lf>"
  notes: Engages repeat chapter function on DVD-V and repeat track function on other media.
  params: []

- id: repeat_ab
  label: Repeat A/B
  kind: action
  command: "RPAB<cr><lf>"
  notes: >
    Engages repeat A/B function. First occurrence sets begin point, second occurrence marks end and starts repeat.
    Only supported on DVD-V media.
  params: []

- id: repeat_off
  label: Repeat Off
  kind: action
  command: "RPOF<cr><lf>"
  notes: Turns off all repeat modes.
  params: []

- id: menu_disc
  label: Activate Disc Menu
  kind: action
  command: "MENU DISC<cr><lf>"
  notes: Activates the Disc Menu. Only valid on DVD-V and DVD-A media.
  params: []

- id: menu_title
  label: Activate Title Menu
  kind: action
  command: "MENU TITLE<cr><lf>"
  notes: Activates the Title Menu. Only valid on DVD-V and DVD-A media.
  params: []

- id: cursor_up
  label: Cursor Up
  kind: action
  command: "UP<cr><lf>"
  notes: Move cursor up.
  params: []

- id: cursor_down
  label: Cursor Down
  kind: action
  command: "DOWN<cr><lf>"
  notes: Move cursor down.
  params: []

- id: cursor_left
  label: Cursor Left
  kind: action
  command: "LEFT<cr><lf>"
  notes: Move cursor left.
  params: []

- id: cursor_right
  label: Cursor Right
  kind: action
  command: "RIGHT<cr><lf>"
  notes: Move cursor right.
  params: []

- id: select
  label: Select
  kind: action
  command: "SELECT<cr><lf>"
  notes: Selects the highlighted item of the menu.
  params: []

- id: subtitle_next
  label: Next Subtitle Track
  kind: action
  command: "SUBT<cr><lf>"
  notes: Selects next available subtitle track. Only available on DVD-V and DVD-A media.
  params: []

- id: audio_next
  label: Next Audio Track
  kind: action
  command: "AUDIO<cr><lf>"
  notes: Selects next available audio track. Only available on DVD-V and DVD-A media.
  params: []

- id: surround_toggle
  label: Toggle Stereo/Surround
  kind: action
  command: "SURR<cr><lf>"
  notes: Toggles between stereo and 5.1 modes.
  params: []

- id: angle_next
  label: Next Camera Angle
  kind: action
  command: "ANGLE<cr><lf>"
  notes: Selects next available camera angle. Only available on DVD-V and DVD-A media.
  params: []

- id: zoom_next
  label: Next Zoom Ratio
  kind: action
  command: "ZOOM<cr><lf>"
  notes: Selects next available zoom ratio. Only available on DVD-V and DVD-A media.
  params: []

- id: aspect_next
  label: Next Aspect Ratio
  kind: action
  command: "ASPECT<cr><lf>"
  notes: Selects next available aspect ratio (16:9 / 4:3 LB / 4:3 PS).
  params: []

- id: volume_set_absolute
  label: Set Volume (Absolute)
  kind: action
  command: "VOLA vvv.v<cr><lf>"
  notes: >
    Sets volume to absolute vvv.v, or nearest possible value.
    Range: 0.0 to 100.0 in 0.5 dB steps.
    Only available if volume control is enabled.
  params:
    - name: level
      type: number
      description: Volume level 0.0–100.0 in 0.5 steps

- id: volume_up
  label: Volume Up
  kind: action
  command: "MVOL+<cr><lf>"
  notes: >
    Increments the volume. Only available if volume control is enabled.
    For system acceleration mode, MVOL+/- commands must be received within 200ms of the unit's reply.
  params: []

- id: volume_down
  label: Volume Down
  kind: action
  command: "MVOL-<cr><lf>"
  notes: >
    Decrements the volume. Only available if volume control is enabled.
    For system acceleration mode, MVOL+/- commands must be received within 200ms of the unit's reply.
  params: []

- id: mute
  label: Mute
  kind: action
  command: "MUTE<cr><lf>"
  notes: Mutes the unit. Only available if volume control is enabled.
  params: []

- id: unmute
  label: Unmute
  kind: action
  command: "UNMT<cr><lf>"
  notes: Un-mutes the unit. Only available if volume control is enabled.
  params: []

- id: lipsync_increase
  label: Lip-Sync Delay Increase
  kind: action
  command: "LSY+<cr><lf>"
  notes: Adds 1 millisecond to the lip-sync delay.
  params: []

- id: lipsync_decrease
  label: Lip-Sync Delay Decrease
  kind: action
  command: "LSY-<cr><lf>"
  notes: Removes 1 millisecond from the lip-sync delay.
  params: []

- id: lipsync_set
  label: Set Lip-Sync Delay
  kind: action
  command: "LSY nnn<cr><lf>"
  notes: Sets the lip-sync delay to the specified value in milliseconds.
  params:
    - name: delay_ms
      type: integer
      description: Lip-sync delay in milliseconds

- id: standby
  label: Standby
  kind: action
  command: "STBY<cr><lf>"
  notes: Puts player into standby mode.
  params: []

- id: operate
  label: Operate (Power On)
  kind: action
  command: "OPER<cr><lf>"
  notes: Puts player into operate mode.
  params: []

- id: lcd_off
  label: LCD Display Off
  kind: action
  command: "LCD0<cr><lf>"
  notes: Sets the front panel LCD off.
  params: []

- id: lcd_low
  label: LCD Display Low Intensity
  kind: action
  command: "LCD1<cr><lf>"
  notes: Sets the front panel LCD to low intensity.
  params: []

- id: lcd_medium
  label: LCD Display Medium Intensity
  kind: action
  command: "LCD2<cr><lf>"
  notes: Sets the front panel LCD to medium intensity.
  params: []

- id: lcd_high
  label: LCD Display High Intensity
  kind: action
  command: "LCD3<cr><lf>"
  notes: Sets the front panel LCD to high intensity.
  params: []

- id: display_disc_elapsed
  label: Display Disc Elapsed Time
  kind: action
  command: "DSCE<cr><lf>"
  notes: Sets the display mode to elapsed time on disc.
  params: []

- id: display_disc_remaining
  label: Display Disc Remaining Time
  kind: action
  command: "DSCR<cr><lf>"
  notes: Sets the display mode to remaining time on disc (default mode when stopped).
  params: []

- id: display_track_elapsed
  label: Display Track Elapsed Time
  kind: action
  command: "TRKE<cr><lf>"
  notes: >
    Sets the display mode to elapsed time on track.
    Note: source section 3.68 shows "DSCE<cr><lf>" as payload but mnemonic heading is TRKE; command is TRKE per section heading.
  params: []

- id: display_track_remaining
  label: Display Track Remaining Time
  kind: action
  command: "TRKR<cr><lf>"
  notes: >
    Sets the display mode to remaining time on track.
    Note: source section 3.69 shows "DSCE<cr><lf>" as payload but mnemonic heading is TRKR; command is TRKR per section heading.
  params: []

- id: stat_system
  label: Query System State
  kind: query
  command: "STAT SYST<cr><lf>"
  notes: Status request for current system state. Response is "SY <status><cr><lf>".
  params: []

- id: stat_auto_enable
  label: Enable Autonomous Status Messages
  kind: action
  command: "STAT AUTO<cr><lf>"
  notes: Enables autonomous status messages. This is the default state.
  params: []

- id: stat_off
  label: Disable Autonomous Status Messages
  kind: action
  command: "STAT OFF<cr><lf>"
  notes: Disables autonomous status messages.
  params: []

- id: stat_disc_time
  label: Query Total Disc Time
  kind: query
  command: "STAT DSCT<cr><lf>"
  notes: Status request for total disc time. Response is "DT tt hh:mm:ss<cr><lf>".
  params: []

- id: stat_track_time
  label: Query Track Time
  kind: query
  command: "STAT TRKT<cr><lf>"
  notes: Status request for track current time. If stopped, returns total track time. Response is "TT ct hh:mm:ss<cr><lf>".
  params: []

- id: stat_disc_info
  label: Query Disc (Album) Info
  kind: query
  command: "STAT DSCI<cr><lf>"
  notes: Status request for ASCII album title. Response is "DI text<cr><lf>".
  params: []

- id: stat_track_info
  label: Query Track Info
  kind: query
  command: "STAT TRKI<cr><lf>"
  notes: Status request for ASCII track title. Response is "TI text<cr><lf>".
  params: []

- id: stat_title
  label: Query Current Title/Group
  kind: query
  command: "STAT TTL<cr><lf>"
  notes: Status request for current selected title or group. Only valid for DVD-V and DVD-A media. Response is "TTL tt<cr><lf>".
  params: []

- id: stat_track
  label: Query Current Track/Chapter
  kind: query
  command: "STAT TRK<cr><lf>"
  notes: Status request for current selected chapter or track. Response is "TRK ccc<cr><lf>".
  params: []

- id: stat_media
  label: Query Media Type
  kind: query
  command: "STAT MEDIA<cr><lf>"
  notes: Status request for current loaded media type. Response is "SY MEDIA mediatype<cr><lf>".
  params: []

- id: stat_main_volume
  label: Query Main Volume
  kind: query
  command: "STAT MAIN<cr><lf>"
  notes: Status request for current main volume. Only available if volume control is enabled. Response is "SY VOLA vv [muted]<cr><lf>" and "SY VOLR svv [muted]<cr><lf>".
  params: []

- id: stat_subtitle
  label: Query Subtitle Track
  kind: query
  command: "STAT SUBT<cr><lf>"
  notes: Status request for current subtitle track information. Only valid for DVD-V and DVD-A media. Response is "SY SUBT language<cr><lf>".
  params: []

- id: stat_audio
  label: Query Audio Track
  kind: query
  command: "STAT AUDIO<cr><lf>"
  notes: Status request for current audio track information. Valid for all media. Response is "SY AUDIO stream samplerate [nCH] [language]<cr><lf>".
  params: []

- id: stat_video
  label: Query Video Info
  kind: query
  command: "STAT VIDEO<cr><lf>"
  notes: Status request for current video information. Only valid on models with a video interface. Response is "SY VIDEO aspect scanning<cr><lf>".
  params: []

- id: stat_lipsync
  label: Query Lip-Sync Delay
  kind: query
  command: "STAT LSY<cr><lf>"
  notes: Status request for current lip-sync information. Response is "SY LSY svvv<cr><lf>".
  params: []

- id: stat_repeat
  label: Query Repeat Mode
  kind: query
  command: "STAT RPT<cr><lf>"
  notes: Status request for current repeat mode. Response is "SY RPT repeat<cr><lf>".
  params: []

- id: stat_random
  label: Query Random Mode
  kind: query
  command: "STAT RNDM<cr><lf>"
  notes: Status request for current random mode. Response is "SY RNDM random<cr><lf>".
  params: []

- id: stat_timemode
  label: Query Display Time Mode
  kind: query
  command: "STAT TMDE<cr><lf>"
  notes: Status request for current display time mode. Response is "SY TMDE timemode<cr><lf>".
  params: []

- id: stat_hdmi
  label: Query HDMI Status
  kind: query
  command: "STAT HDMI<cr><lf>"
  notes: Status request for current HDMI interface information. Only valid on models with an HDMI interface. Response is "SY HDMI status [resolution]<cr><lf>".
  params: []

Feedbacks

- id: system_state
  label: System State
  type: enum
  message_format: "SY {status}<cr><lf>"
  values:
    - OPEN       # tray is open (tray loader only)
    - TRAY       # tray is moving (tray loader only)
    - EJCT       # media being ejected (slot loader only)
    - STBY       # player in standby
    - OPER       # player in operating state
    - SPIN       # disc being detected / TOC being read
    - VOID       # no disc in loader
    - PLAY       # disc is playing
    - DVDMENU    # DVD menu is active
    - PRESTOP    # player in pre-stop state
    - STOP       # player in stop state
    - PAUS       # player in pause state
    - "FWD speed" # searching forward at speed
    - "REV speed" # searching reverse at speed
    - ERR        # player in error state
  notes: Triggered by STAT SYST or autonomously on state change.

- id: disc_time
  label: Total Disc Time
  type: string
  message_format: "DT tt hh:mm:ss<cr><lf>"
  notes: >
    tt = number of chapters or tracks (0-255); hh:mm:ss = total disc time.
    Triggered by STAT DSCT, disc insertion, or entering stop state (autonomous).

- id: track_time
  label: Track Current Time
  type: string
  message_format: "TT ct hh:mm:ss<cr><lf>"
  notes: >
    ct = current chapter or track number (0-255); hh:mm:ss = current track time (or total track time if stopped).
    Triggered by STAT TRKT or autonomously on media insertion.

- id: disc_info
  label: Album ASCII Information
  type: string
  message_format: "DI text<cr><lf>"
  notes: Album name and artist name when available. Triggered by STAT DSCI, track selection, or while playing (autonomous).

- id: track_info
  label: Track ASCII Information
  type: string
  message_format: "TI text<cr><lf>"
  notes: Track name when available. Triggered by STAT TRKI, track selection, or while playing (autonomous).

- id: title_status
  label: Current Title/Group
  type: string
  message_format: "TTL tt<cr><lf>"
  notes: tt = title or group number, or "- -" if unknown. Triggered by STAT TTL or on title/group selection (autonomous).

- id: track_status
  label: Current Track/Chapter
  type: string
  message_format: "TRK ccc<cr><lf>"
  notes: ccc = chapter or track number, or "- - -" if unknown. Triggered by STAT TRK or on selection (autonomous).

- id: media_type
  label: Media Type
  type: enum
  message_format: "SY MEDIA mediatype<cr><lf>"
  values:
    - DONE   # loader is empty
    - DVD    # DVD VIDEO disc
    - DVDA   # DVD AUDIO disc
    - CDDA   # CD-DA disc
    - VCD    # VCD disc
    - SVCD   # SVCD disc
    - SACD   # SACD disc
    - DATA   # Data disc (MP3, WMA, AAC)
  notes: Triggered by STAT MEDIA or on disc insertion (autonomous).

- id: volume_absolute
  label: Volume (Absolute)
  type: number
  message_format: "SY VOLA vv [muted]<cr><lf>"
  notes: vv = 0.0–100.0 in 0.5 steps; "muted" appended if unit is muted. Triggered by STAT MAIN or on volume change (autonomous).

- id: volume_relative
  label: Volume (Relative)
  type: number
  message_format: "SY VOLR svv [muted]<cr><lf>"
  notes: svv = -89.0 to +14.0 in 0.5 steps; "muted" appended if unit is muted. Triggered by STAT MAIN or on volume change (autonomous).

- id: subtitle_language
  label: Subtitle Language
  type: string
  message_format: "SY SUBT language<cr><lf>"
  notes: language = current subtitle language name. Only valid for DVD-V and DVD-A. Triggered by STAT SUBT or on subtitle change (autonomous).

- id: audio_stream
  label: Audio Stream Info
  type: string
  message_format: "SY AUDIO stream samplerate [nCH] [language]<cr><lf>"
  notes: >
    stream: DOLBY, WMA, MP3, CDDA, DTS, LPCM, DSDSTEREO, DSDMULTI, DSDDOWNMIX, MUSICAM, SDDS, PCM, DMC, MLP, MPEG1, MPEG2, AAC, HDCD, PNG, NONE.
    samplerate: 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, 96kHz, 128kHz, 176.4kHz, 192kHz, SPDIF, NONE.
    nCH: 1-8 (DVD/DVD-A only). language: current language (DVD/DVD-A only).
    Triggered by STAT AUDIO or on audio parameter change (autonomous).

- id: video_info
  label: Video Stream Info
  type: string
  message_format: "SY VIDEO aspect scanning<cr><lf>"
  notes: >
    aspect: 4:3PS, 16:9, 4:3LB, NONE.
    scanning: PROG (progressive), INT (interlaced), NONE.
    Triggered by STAT VIDEO or on video parameter change (autonomous). Only valid on models with video interface.

- id: lipsync_delay
  label: Lip-Sync Delay
  type: integer
  message_format: "SY LSY svvv<cr><lf>"
  notes: svvv = -100 to 100 in 1 ms steps. Triggered by STAT LSY or on lip-sync change (autonomous).

- id: repeat_mode
  label: Repeat Mode
  type: enum
  message_format: "SY RPT repeat<cr><lf>"
  values:
    - RPDC   # repeat disc
    - RPTK   # repeat track or chapter
    - RPA    # repeat A-B (start point only selected)
    - RPAB   # repeat A-B
    - RPTT   # repeat title or group (DVD-V/DVD-A only)
    - OFF    # repeat off
  notes: Triggered by STAT RPT or on repeat mode change (autonomous).

- id: random_mode
  label: Random Mode
  type: enum
  message_format: "SY RNDM random<cr><lf>"
  values:
    - RNDM   # random play
    - SHFL   # shuffle play
    - OFF    # random off
  notes: Triggered by STAT RNDM or on random mode change (autonomous).

- id: time_display_mode
  label: Display Time Mode
  type: enum
  message_format: "SY TMDE timemode<cr><lf>"
  values:
    - TRKE   # track elapsed time
    - TRKR   # track remaining time
    - DSCE   # disc elapsed time
    - DSCR   # disc remaining time
    - OFF    # display off
  notes: Triggered by STAT TMDE or on display time mode change (autonomous).

- id: hdmi_status
  label: HDMI Interface Status
  type: string
  message_format: "SY HDMI status [resolution]<cr><lf>"
  notes: >
    status: INACTIVE (interface inactive); table described as "to be completed" in source.
    resolution: UNKNOWN; table described as "to be completed" in source.
    Triggered by STAT HDMI or on HDMI status/resolution change. Only valid on models with HDMI interface.

- id: ack_positive
  label: Positive Acknowledgement
  type: enum
  message_format: "!<cr><lf>"
  notes: Sent within 100ms of last command termination character. Indicates command was recognized.

- id: ack_negative
  label: Negative Acknowledgement
  type: enum
  message_format: "?<cr><lf>"
  notes: Sent within 100ms of last command termination character. Indicates command was not recognized.

Variables

# UNRESOLVED: no separately documented settable variables beyond commands above

Events

# Autonomous status messages are unsolicited notifications sent by the player when state changes.
# They can be disabled via "STAT OFF<cr><lf>" and re-enabled via "STAT AUTO<cr><lf>".
# All feedback entries above marked "autonomous" are emitted as events.

Macros

# UNRESOLVED: no multi-step sequences explicitly described in source

Safety

confirmation_required_for: []
interlocks:
  - description: OPEN and CLOSE commands are only valid on tray loader units; EJCT is only valid on slot loader units.
  - description: STEP is only valid during pause state on DVD-V disc.
  - description: FWD, REV commands are only valid if the disc is currently playing.
  - description: SFWD, SREV, FFWD, FREV commands are only valid if a DVD-V disc is currently playing.
  - description: SPEED+/SPEED- commands are only valid if a disc is currently in search mode.
  - description: STILL+/STILL- commands are only valid for DVD-A media.
  - description: NEXT TITLE, PREV TITLE, MENU DISC, MENU TITLE, SUBT, AUDIO, ANGLE, ZOOM commands are only valid for DVD-V and DVD-A media.
  - description: VOLA, MVOL+, MVOL-, MUTE, UNMT commands are only available if volume control is enabled.
  - description: RPTT repeat mode only applicable to DVD-V and DVD-A media.
  - description: SHFL, PRG+, PRG-, PCLR, PEMPTY, SAVE commands are only valid for CDDA media.
  - description: STAT VIDEO and STAT HDMI queries only valid on models equipped with the respective interface.

Notes

Address prefix: The 4-byte address field (e.g. P300.) plus period delimiter may be omitted when the controller connects uniquely to the player. Both P300.PLAY<cr><lf> and PLAY<cr><lf> are valid.
Command acknowledgement timing: The CDP-300 generates a 3-character reply within 100ms of the last command termination character (line feed). If no reply is received after 100ms, the command should be reissued.
FIFO buffer: No minimum time between bytes is required; the player maintains a 16-byte FIFO.
Volume acceleration mode: For MVOL+/MVOL- to use system acceleration mode, successive commands must be received within 200ms of the unit's reply.
Source document note (TRKE/TRKR commands): Source sections 3.68 (TRKE) and 3.69 (TRKR) both show DSCE<cr><lf> as the command payload — this appears to be a copy-paste error in the source. Commands are authoured per their mnemonic headings (TRKE/TRKR).
Source document note (SHFL command): Source section 3.27 (SHFL) shows OPEN<cr><lf> as the command payload — this appears to be a copy-paste error. Command is authoured as SHFL per the section heading.
Compatible models: This document covers CDP-102, CDP-202, CDP-300, CDP-502, and CDT-300. The protocol document uses CDP-300 as the primary reference model; the address field for other models may differ (source does not explicitly state alternative address prefixes for the CDP-102/202/502/CDT-300).
DB-9 connector: The RS-232 port uses a standard DB-9 connector configured as DCE; a regular serial cable can be used to connect to a computer.

Provenance

source_domains:
  - support.classeaudio.com
source_urls:
  - https://support.classeaudio.com/files/documents/automation_and_control/rs232/CLASSE_CDP_102_202_300_502_RS232_Protocol.pdf
retrieved_at: 2026-05-20T19:38:32.915Z
last_checked_at: 2026-06-23T10:38:23.936Z

Verification Summary

verdict: verified
checked_at: 2026-06-23T10:38:23.936Z
matched_actions: 88
action_count: 88
confidence: medium
summary: "All 88 spec actions matched verbatim against source; transport 9600/8/N/1 verified; full coverage. (2 unresolved item(s) noted in Known Gaps.)"

Known Gaps

- "no separately documented settable variables beyond commands above"
- "no multi-step sequences explicitly described in source"

From the AI4AV catalog (https://ai4av.net) · ODbL-1.0

Summary

Actions

# Command structure: all commands terminate with <cr><lf>. # Address prefix "P300." may be prepended (e.g. "P300.PLAY<cr><lf>") but is optional. # Positive ACK: "!<cr><lf>"; Negative ACK: "?<cr><lf>" - id: open_tray label: Open Tray kind: action command: "OPEN<cr><lf>" notes: Only valid on tray loader units. params: [] - id: close_tray label: Close Tray kind: action command: "CLOSE<cr><lf>" notes: Only valid on tray loader units. params: [] - id: eject_disc label: Eject Disc kind: action command: "EJCT<cr><lf>" notes: Only valid on slot loader units. params: [] - id: play label: Play kind: action command: "PLAY<cr><lf>" params: [] - id: stop label: Stop kind: action command: "STOP<cr><lf>" params: [] - id: pause label: Pause kind: action command: "PAUS<cr><lf>" params: [] - id: step_frame label: Step Frame kind: action command: "STEP<cr><lf>" notes: Valid only during pause state on DVD-V disc. Advances to next video frame. params: [] - id: unpause label: Unpause (Resume) kind: action command: "UNPS<cr><lf>" params: [] - id: next_track label: Next Track/Chapter kind: action command: "NEXT<cr><lf>" notes: Skips to next track/chapter on disc or in program. params: [] - id: prev_track label: Previous Track/Chapter kind: action command: "PREV<cr><lf>" notes: Skips back to previous track/chapter on disc or in program. params: [] - id: next_title label: Next Title/Group kind: action command: "NEXT TITLE<cr><lf>" notes: Skips to next title or group on DVD-V or DVD-A media. params: [] - id: prev_title label: Previous Title/Group kind: action command: "PREV TITLE<cr><lf>" notes: Skips to previous title or group on DVD-V or DVD-A media. params: [] - id: seek_forward label: Seek Forward kind: action command: "FWD [speed]<cr><lf>" notes: > Seek forward at specified speed. Only valid if disc is currently playing. Speed parameter optional; defaults to 2X. CDDA valid speeds: 2X 4X 8X 16X. DVD-V/DVD-A valid speeds: 1/8 1/4 1/2 2X 4X 8X 16X 30X 60X. MP3/WMA/AAC valid speeds: 4X. params: - name: speed type: string description: Playback speed multiplier (optional, defaults to 2X) - id: seek_reverse label: Seek Reverse kind: action command: "REV [speed]<cr><lf>" notes: > Seek reverse at specified speed. Only valid if disc is currently playing. Speed parameter optional; defaults to 2X. CDDA valid speeds: 2X 4X 8X 16X. DVD-V/DVD-A valid speeds: 1/8 1/4 1/2 2X 4X 8X 16X 30X 60X. MP3/WMA/AAC valid speeds: 4X. params: - name: speed type: string description: Playback speed multiplier (optional, defaults to 2X) - id: slow_forward label: Slow Forward kind: action command: "SFWD<cr><lf>" notes: Slow forward at half speed. Only valid if DVD-V disc is currently playing. Repeated commands increase speed. params: [] - id: slow_reverse label: Slow Reverse kind: action command: "SREV<cr><lf>" notes: Slow reverse at half speed. Only valid if DVD-V disc is currently playing. Repeated commands decrease speed. params: [] - id: fast_forward label: Fast Forward kind: action command: "FFWD<cr><lf>" notes: Fast forward at double speed (quad speed for MP3/WMA/AAC). Only valid if DVD-V disc is playing. Repeated commands increase speed. params: [] - id: fast_reverse label: Fast Reverse kind: action command: "FREV<cr><lf>" notes: Fast reverse at double speed (quad speed for MP3/WMA/AAC). Only valid if DVD-V disc is playing. Repeated commands decrease speed. params: [] - id: speed_increase label: Increase Search Speed kind: action command: "SPEED+<cr><lf>" notes: Increases search speed. Only valid if disc is currently in search mode. params: [] - id: speed_decrease label: Decrease Search Speed kind: action command: "SPEED-<cr><lf>" notes: Decreases search speed. Only valid if disc is currently in search mode. params: [] - id: still_next label: Next Still Image kind: action command: "STILL+<cr><lf>" notes: Go to next still image. Only valid for DVD-A media. params: [] - id: still_prev label: Previous Still Image kind: action command: "STILL-<cr><lf>" notes: Go to previous still image. Only valid for DVD-A media. params: [] - id: jump_time label: Jump to Time kind: action command: "JUMP TIME [[hh:]mm:]ss<cr><lf>" notes: > Jump to a specific time on the disc. hh: hours (0-99, optional); mm: minutes (0-59, optional if hh omitted); ss: seconds (0-59). params: - name: time type: string description: "Time in [[hh:]mm:]ss format" - id: jump_title_chapter label: Jump to Title/Chapter kind: action command: "JUMP [tt:]ccc<cr><lf>" notes: > Jump to a specific title/chapter or group/track. tt: title (DVD-V 0-99) or group (DVD-A 0-9), optional. ccc: chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99). params: - name: title type: integer description: Title (DVD-V 0-99) or group (DVD-A 0-9); optional - name: chapter_track type: integer description: Chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99) - id: track_jump label: Jump to Track/Chapter kind: action command: "TRACK ccc<cr><lf>" notes: > Jump to a specific chapter or track. ccc: chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99). params: - name: chapter_track type: integer description: Chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99) - id: title_jump label: Jump to Title/Group kind: action command: "TITLE tt<cr><lf>" notes: > Jump to a specific title or group. tt: title (DVD-V 0-99) or group (DVD-A 0-9). params: - name: title type: integer description: Title (DVD-V 0-99) or group (DVD-A 0-9) - id: shuffle label: Shuffle Play kind: action command: "SHFL<cr><lf>" notes: Begins shuffle play of disc. Only valid for CDDA media. (Note: source section 3.27 incorrectly shows OPEN as the command; SHFL is the mnemonic heading.) params: [] - id: program_add label: Add Track to Program kind: action command: "PRG+<cr><lf>" notes: Adds current selected track to program. Only valid for CDDA media. params: [] - id: program_remove label: Remove Track from Program kind: action command: "PRG-<cr><lf>" notes: Removes current selected track from program. Only valid for CDDA media. params: [] - id: program_clear label: Clear Playlist kind: action command: "PCLR<cr><lf>" notes: Clears (empties) the current playlist. Only valid for CDDA media. params: [] - id: program_empty label: Reset Playlist to TOC kind: action command: "PEMPTY<cr><lf>" notes: Resets the playlist to disc's table of contents. Only valid for CDDA media. params: [] - id: save_program label: Save Program kind: action command: "SAVE<cr><lf>" notes: Saves the currently constructed program. Only valid for CDDA media. params: [] - id: jump_direct_number label: Jump by Direct Number (0-255) kind: action command: "ccc<cr><lf>" notes: > Jump to a specific chapter or track by entering the number directly. ccc: chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99). params: - name: number type: integer description: Chapter (DVD-V 0-225) or track (CDDA/DVD-A 0-99) - id: repeat_disc label: Repeat Disc kind: action command: "RPDC<cr><lf>" notes: Engages repeat disc function. params: [] - id: repeat_title label: Repeat Title/Group kind: action command: "RPTT<cr><lf>" notes: Engages repeat title function on DVD-V and repeat group function on DVD-A. params: [] - id: repeat_track label: Repeat Track/Chapter kind: action command: "RPTK<cr><lf>" notes: Engages repeat chapter function on DVD-V and repeat track function on other media. params: [] - id: repeat_ab label: Repeat A/B kind: action command: "RPAB<cr><lf>" notes: > Engages repeat A/B function. First occurrence sets begin point, second occurrence marks end and starts repeat. Only supported on DVD-V media. params: [] - id: repeat_off label: Repeat Off kind: action command: "RPOF<cr><lf>" notes: Turns off all repeat modes. params: [] - id: menu_disc label: Activate Disc Menu kind: action command: "MENU DISC<cr><lf>" notes: Activates the Disc Menu. Only valid on DVD-V and DVD-A media. params: [] - id: menu_title label: Activate Title Menu kind: action command: "MENU TITLE<cr><lf>" notes: Activates the Title Menu. Only valid on DVD-V and DVD-A media. params: [] - id: cursor_up label: Cursor Up kind: action command: "UP<cr><lf>" notes: Move cursor up. params: [] - id: cursor_down label: Cursor Down kind: action command: "DOWN<cr><lf>" notes: Move cursor down. params: [] - id: cursor_left label: Cursor Left kind: action command: "LEFT<cr><lf>" notes: Move cursor left. params: [] - id: cursor_right label: Cursor Right kind: action command: "RIGHT<cr><lf>" notes: Move cursor right. params: [] - id: select label: Select kind: action command: "SELECT<cr><lf>" notes: Selects the highlighted item of the menu. params: [] - id: subtitle_next label: Next Subtitle Track kind: action command: "SUBT<cr><lf>" notes: Selects next available subtitle track. Only available on DVD-V and DVD-A media. params: [] - id: audio_next label: Next Audio Track kind: action command: "AUDIO<cr><lf>" notes: Selects next available audio track. Only available on DVD-V and DVD-A media. params: [] - id: surround_toggle label: Toggle Stereo/Surround kind: action command: "SURR<cr><lf>" notes: Toggles between stereo and 5.1 modes. params: [] - id: angle_next label: Next Camera Angle kind: action command: "ANGLE<cr><lf>" notes: Selects next available camera angle. Only available on DVD-V and DVD-A media. params: [] - id: zoom_next label: Next Zoom Ratio kind: action command: "ZOOM<cr><lf>" notes: Selects next available zoom ratio. Only available on DVD-V and DVD-A media. params: [] - id: aspect_next label: Next Aspect Ratio kind: action command: "ASPECT<cr><lf>" notes: Selects next available aspect ratio (16:9 / 4:3 LB / 4:3 PS). params: [] - id: volume_set_absolute label: Set Volume (Absolute) kind: action command: "VOLA vvv.v<cr><lf>" notes: > Sets volume to absolute vvv.v, or nearest possible value. Range: 0.0 to 100.0 in 0.5 dB steps. Only available if volume control is enabled. params: - name: level type: number description: Volume level 0.0–100.0 in 0.5 steps - id: volume_up label: Volume Up kind: action command: "MVOL+<cr><lf>" notes: > Increments the volume. Only available if volume control is enabled. For system acceleration mode, MVOL+/- commands must be received within 200ms of the unit's reply. params: [] - id: volume_down label: Volume Down kind: action command: "MVOL-<cr><lf>" notes: > Decrements the volume. Only available if volume control is enabled. For system acceleration mode, MVOL+/- commands must be received within 200ms of the unit's reply. params: [] - id: mute label: Mute kind: action command: "MUTE<cr><lf>" notes: Mutes the unit. Only available if volume control is enabled. params: [] - id: unmute label: Unmute kind: action command: "UNMT<cr><lf>" notes: Un-mutes the unit. Only available if volume control is enabled. params: [] - id: lipsync_increase label: Lip-Sync Delay Increase kind: action command: "LSY+<cr><lf>" notes: Adds 1 millisecond to the lip-sync delay. params: [] - id: lipsync_decrease label: Lip-Sync Delay Decrease kind: action command: "LSY-<cr><lf>" notes: Removes 1 millisecond from the lip-sync delay. params: [] - id: lipsync_set label: Set Lip-Sync Delay kind: action command: "LSY nnn<cr><lf>" notes: Sets the lip-sync delay to the specified value in milliseconds. params: - name: delay_ms type: integer description: Lip-sync delay in milliseconds - id: standby label: Standby kind: action command: "STBY<cr><lf>" notes: Puts player into standby mode. params: [] - id: operate label: Operate (Power On) kind: action command: "OPER<cr><lf>" notes: Puts player into operate mode. params: [] - id: lcd_off label: LCD Display Off kind: action command: "LCD0<cr><lf>" notes: Sets the front panel LCD off. params: [] - id: lcd_low label: LCD Display Low Intensity kind: action command: "LCD1<cr><lf>" notes: Sets the front panel LCD to low intensity. params: [] - id: lcd_medium label: LCD Display Medium Intensity kind: action command: "LCD2<cr><lf>" notes: Sets the front panel LCD to medium intensity. params: [] - id: lcd_high label: LCD Display High Intensity kind: action command: "LCD3<cr><lf>" notes: Sets the front panel LCD to high intensity. params: [] - id: display_disc_elapsed label: Display Disc Elapsed Time kind: action command: "DSCE<cr><lf>" notes: Sets the display mode to elapsed time on disc. params: [] - id: display_disc_remaining label: Display Disc Remaining Time kind: action command: "DSCR<cr><lf>" notes: Sets the display mode to remaining time on disc (default mode when stopped). params: [] - id: display_track_elapsed label: Display Track Elapsed Time kind: action command: "TRKE<cr><lf>" notes: > Sets the display mode to elapsed time on track. Note: source section 3.68 shows "DSCE<cr><lf>" as payload but mnemonic heading is TRKE; command is TRKE per section heading. params: [] - id: display_track_remaining label: Display Track Remaining Time kind: action command: "TRKR<cr><lf>" notes: > Sets the display mode to remaining time on track. Note: source section 3.69 shows "DSCE<cr><lf>" as payload but mnemonic heading is TRKR; command is TRKR per section heading. params: [] - id: stat_system label: Query System State kind: query command: "STAT SYST<cr><lf>" notes: Status request for current system state. Response is "SY <status><cr><lf>". params: [] - id: stat_auto_enable label: Enable Autonomous Status Messages kind: action command: "STAT AUTO<cr><lf>" notes: Enables autonomous status messages. This is the default state. params: [] - id: stat_off label: Disable Autonomous Status Messages kind: action command: "STAT OFF<cr><lf>" notes: Disables autonomous status messages. params: [] - id: stat_disc_time label: Query Total Disc Time kind: query command: "STAT DSCT<cr><lf>" notes: Status request for total disc time. Response is "DT tt hh:mm:ss<cr><lf>". params: [] - id: stat_track_time label: Query Track Time kind: query command: "STAT TRKT<cr><lf>" notes: Status request for track current time. If stopped, returns total track time. Response is "TT ct hh:mm:ss<cr><lf>". params: [] - id: stat_disc_info label: Query Disc (Album) Info kind: query command: "STAT DSCI<cr><lf>" notes: Status request for ASCII album title. Response is "DI text<cr><lf>". params: [] - id: stat_track_info label: Query Track Info kind: query command: "STAT TRKI<cr><lf>" notes: Status request for ASCII track title. Response is "TI text<cr><lf>". params: [] - id: stat_title label: Query Current Title/Group kind: query command: "STAT TTL<cr><lf>" notes: Status request for current selected title or group. Only valid for DVD-V and DVD-A media. Response is "TTL tt<cr><lf>". params: [] - id: stat_track label: Query Current Track/Chapter kind: query command: "STAT TRK<cr><lf>" notes: Status request for current selected chapter or track. Response is "TRK ccc<cr><lf>". params: [] - id: stat_media label: Query Media Type kind: query command: "STAT MEDIA<cr><lf>" notes: Status request for current loaded media type. Response is "SY MEDIA mediatype<cr><lf>". params: [] - id: stat_main_volume label: Query Main Volume kind: query command: "STAT MAIN<cr><lf>" notes: Status request for current main volume. Only available if volume control is enabled. Response is "SY VOLA vv [muted]<cr><lf>" and "SY VOLR svv [muted]<cr><lf>". params: [] - id: stat_subtitle label: Query Subtitle Track kind: query command: "STAT SUBT<cr><lf>" notes: Status request for current subtitle track information. Only valid for DVD-V and DVD-A media. Response is "SY SUBT language<cr><lf>". params: [] - id: stat_audio label: Query Audio Track kind: query command: "STAT AUDIO<cr><lf>" notes: Status request for current audio track information. Valid for all media. Response is "SY AUDIO stream samplerate [nCH] [language]<cr><lf>". params: [] - id: stat_video label: Query Video Info kind: query command: "STAT VIDEO<cr><lf>" notes: Status request for current video information. Only valid on models with a video interface. Response is "SY VIDEO aspect scanning<cr><lf>". params: [] - id: stat_lipsync label: Query Lip-Sync Delay kind: query command: "STAT LSY<cr><lf>" notes: Status request for current lip-sync information. Response is "SY LSY svvv<cr><lf>". params: [] - id: stat_repeat label: Query Repeat Mode kind: query command: "STAT RPT<cr><lf>" notes: Status request for current repeat mode. Response is "SY RPT repeat<cr><lf>". params: [] - id: stat_random label: Query Random Mode kind: query command: "STAT RNDM<cr><lf>" notes: Status request for current random mode. Response is "SY RNDM random<cr><lf>". params: [] - id: stat_timemode label: Query Display Time Mode kind: query command: "STAT TMDE<cr><lf>" notes: Status request for current display time mode. Response is "SY TMDE timemode<cr><lf>". params: [] - id: stat_hdmi label: Query HDMI Status kind: query command: "STAT HDMI<cr><lf>" notes: Status request for current HDMI interface information. Only valid on models with an HDMI interface. Response is "SY HDMI status [resolution]<cr><lf>". params: []

Feedbacks

- id: system_state label: System State type: enum message_format: "SY {status}<cr><lf>" values: - OPEN # tray is open (tray loader only) - TRAY # tray is moving (tray loader only) - EJCT # media being ejected (slot loader only) - STBY # player in standby - OPER # player in operating state - SPIN # disc being detected / TOC being read - VOID # no disc in loader - PLAY # disc is playing - DVDMENU # DVD menu is active - PRESTOP # player in pre-stop state - STOP # player in stop state - PAUS # player in pause state - "FWD speed" # searching forward at speed - "REV speed" # searching reverse at speed - ERR # player in error state notes: Triggered by STAT SYST or autonomously on state change. - id: disc_time label: Total Disc Time type: string message_format: "DT tt hh:mm:ss<cr><lf>" notes: > tt = number of chapters or tracks (0-255); hh:mm:ss = total disc time. Triggered by STAT DSCT, disc insertion, or entering stop state (autonomous). - id: track_time label: Track Current Time type: string message_format: "TT ct hh:mm:ss<cr><lf>" notes: > ct = current chapter or track number (0-255); hh:mm:ss = current track time (or total track time if stopped). Triggered by STAT TRKT or autonomously on media insertion. - id: disc_info label: Album ASCII Information type: string message_format: "DI text<cr><lf>" notes: Album name and artist name when available. Triggered by STAT DSCI, track selection, or while playing (autonomous). - id: track_info label: Track ASCII Information type: string message_format: "TI text<cr><lf>" notes: Track name when available. Triggered by STAT TRKI, track selection, or while playing (autonomous). - id: title_status label: Current Title/Group type: string message_format: "TTL tt<cr><lf>" notes: tt = title or group number, or "- -" if unknown. Triggered by STAT TTL or on title/group selection (autonomous). - id: track_status label: Current Track/Chapter type: string message_format: "TRK ccc<cr><lf>" notes: ccc = chapter or track number, or "- - -" if unknown. Triggered by STAT TRK or on selection (autonomous). - id: media_type label: Media Type type: enum message_format: "SY MEDIA mediatype<cr><lf>" values: - DONE # loader is empty - DVD # DVD VIDEO disc - DVDA # DVD AUDIO disc - CDDA # CD-DA disc - VCD # VCD disc - SVCD # SVCD disc - SACD # SACD disc - DATA # Data disc (MP3, WMA, AAC) notes: Triggered by STAT MEDIA or on disc insertion (autonomous). - id: volume_absolute label: Volume (Absolute) type: number message_format: "SY VOLA vv [muted]<cr><lf>" notes: vv = 0.0–100.0 in 0.5 steps; "muted" appended if unit is muted. Triggered by STAT MAIN or on volume change (autonomous). - id: volume_relative label: Volume (Relative) type: number message_format: "SY VOLR svv [muted]<cr><lf>" notes: svv = -89.0 to +14.0 in 0.5 steps; "muted" appended if unit is muted. Triggered by STAT MAIN or on volume change (autonomous). - id: subtitle_language label: Subtitle Language type: string message_format: "SY SUBT language<cr><lf>" notes: language = current subtitle language name. Only valid for DVD-V and DVD-A. Triggered by STAT SUBT or on subtitle change (autonomous). - id: audio_stream label: Audio Stream Info type: string message_format: "SY AUDIO stream samplerate [nCH] [language]<cr><lf>" notes: > stream: DOLBY, WMA, MP3, CDDA, DTS, LPCM, DSDSTEREO, DSDMULTI, DSDDOWNMIX, MUSICAM, SDDS, PCM, DMC, MLP, MPEG1, MPEG2, AAC, HDCD, PNG, NONE. samplerate: 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz, 96kHz, 128kHz, 176.4kHz, 192kHz, SPDIF, NONE. nCH: 1-8 (DVD/DVD-A only). language: current language (DVD/DVD-A only). Triggered by STAT AUDIO or on audio parameter change (autonomous). - id: video_info label: Video Stream Info type: string message_format: "SY VIDEO aspect scanning<cr><lf>" notes: > aspect: 4:3PS, 16:9, 4:3LB, NONE. scanning: PROG (progressive), INT (interlaced), NONE. Triggered by STAT VIDEO or on video parameter change (autonomous). Only valid on models with video interface. - id: lipsync_delay label: Lip-Sync Delay type: integer message_format: "SY LSY svvv<cr><lf>" notes: svvv = -100 to 100 in 1 ms steps. Triggered by STAT LSY or on lip-sync change (autonomous). - id: repeat_mode label: Repeat Mode type: enum message_format: "SY RPT repeat<cr><lf>" values: - RPDC # repeat disc - RPTK # repeat track or chapter - RPA # repeat A-B (start point only selected) - RPAB # repeat A-B - RPTT # repeat title or group (DVD-V/DVD-A only) - OFF # repeat off notes: Triggered by STAT RPT or on repeat mode change (autonomous). - id: random_mode label: Random Mode type: enum message_format: "SY RNDM random<cr><lf>" values: - RNDM # random play - SHFL # shuffle play - OFF # random off notes: Triggered by STAT RNDM or on random mode change (autonomous). - id: time_display_mode label: Display Time Mode type: enum message_format: "SY TMDE timemode<cr><lf>" values: - TRKE # track elapsed time - TRKR # track remaining time - DSCE # disc elapsed time - DSCR # disc remaining time - OFF # display off notes: Triggered by STAT TMDE or on display time mode change (autonomous). - id: hdmi_status label: HDMI Interface Status type: string message_format: "SY HDMI status [resolution]<cr><lf>" notes: > status: INACTIVE (interface inactive); table described as "to be completed" in source. resolution: UNKNOWN; table described as "to be completed" in source. Triggered by STAT HDMI or on HDMI status/resolution change. Only valid on models with HDMI interface. - id: ack_positive label: Positive Acknowledgement type: enum message_format: "!<cr><lf>" notes: Sent within 100ms of last command termination character. Indicates command was recognized. - id: ack_negative label: Negative Acknowledgement type: enum message_format: "?<cr><lf>" notes: Sent within 100ms of last command termination character. Indicates command was not recognized.

# Autonomous status messages are unsolicited notifications sent by the player when state changes. # They can be disabled via "STAT OFF<cr><lf>" and re-enabled via "STAT AUTO<cr><lf>". # All feedback entries above marked "autonomous" are emitted as events.

Safety

confirmation_required_for: [] interlocks: - description: OPEN and CLOSE commands are only valid on tray loader units; EJCT is only valid on slot loader units. - description: STEP is only valid during pause state on DVD-V disc. - description: FWD, REV commands are only valid if the disc is currently playing. - description: SFWD, SREV, FFWD, FREV commands are only valid if a DVD-V disc is currently playing. - description: SPEED+/SPEED- commands are only valid if a disc is currently in search mode. - description: STILL+/STILL- commands are only valid for DVD-A media. - description: NEXT TITLE, PREV TITLE, MENU DISC, MENU TITLE, SUBT, AUDIO, ANGLE, ZOOM commands are only valid for DVD-V and DVD-A media. - description: VOLA, MVOL+, MVOL-, MUTE, UNMT commands are only available if volume control is enabled. - description: RPTT repeat mode only applicable to DVD-V and DVD-A media. - description: SHFL, PRG+, PRG-, PCLR, PEMPTY, SAVE commands are only valid for CDDA media. - description: STAT VIDEO and STAT HDMI queries only valid on models equipped with the respective interface.

Notes

Address prefix: The 4-byte address field (e.g. P300.) plus period delimiter may be omitted when the controller connects uniquely to the player. Both P300.PLAY<cr><lf> and PLAY<cr><lf> are valid.

Command acknowledgement timing: The CDP-300 generates a 3-character reply within 100ms of the last command termination character (line feed). If no reply is received after 100ms, the command should be reissued.

FIFO buffer: No minimum time between bytes is required; the player maintains a 16-byte FIFO.

Volume acceleration mode: For MVOL+/MVOL- to use system acceleration mode, successive commands must be received within 200ms of the unit's reply.

Source document note (TRKE/TRKR commands): Source sections 3.68 (TRKE) and 3.69 (TRKR) both show DSCE<cr><lf> as the command payload — this appears to be a copy-paste error in the source. Commands are authoured per their mnemonic headings (TRKE/TRKR).

Source document note (SHFL command): Source section 3.27 (SHFL) shows OPEN<cr><lf> as the command payload — this appears to be a copy-paste error. Command is authoured as SHFL per the section heading.

Compatible models: This document covers CDP-102, CDP-202, CDP-300, CDP-502, and CDT-300. The protocol document uses CDP-300 as the primary reference model; the address field for other models may differ (source does not explicitly state alternative address prefixes for the CDP-102/202/502/CDT-300).

DB-9 connector: The RS-232 port uses a standard DB-9 connector configured as DCE; a regular serial cable can be used to connect to a computer.

source_domains: - support.classeaudio.com source_urls: - https://support.classeaudio.com/files/documents/automation_and_control/rs232/CLASSE_CDP_102_202_300_502_RS232_Protocol.pdf retrieved_at: 2026-05-20T19:38:32.915Z last_checked_at: 2026-06-23T10:38:23.936Z

verdict: verified checked_at: 2026-06-23T10:38:23.936Z matched_actions: 88 action_count: 88 confidence: medium summary: "All 88 spec actions matched verbatim against source; transport 9600/8/N/1 verified; full coverage. (2 unresolved item(s) noted in Known Gaps.)"

Classe Audio CDP-102/202 Serial Control Spec

Compatible models

Summary

Transport

Traits

Actions

Feedbacks

Variables

Events

Macros

Safety

Notes

Provenance

Verification Summary

Known Gaps

Source & contribution

Classe Audio CDP-102/202 Serial Control Spec

Compatible models

Summary

Transport

Traits

Actions

Feedbacks

Variables

Events

Macros

Safety

Notes

Provenance

Verification Summary

Known Gaps

Source & contribution