Lexicon, Inc. MC Series Control Spec

Summary

Lexicon MC Series (MC-10, RV-9, RV-6) AV receivers supporting both RS-232 and IP (NET) control. Communication uses a binary packet format with start byte 0x21, zone number, command code, data length, optional data, and end byte 0x0D. IP control uses port 50000.

Transport

protocols:
  - serial
  - tcp
serial:
  baud_rate: 38400
  data_bits: 8
  parity: none
  stop_bits: 1
  flow_control: none
addressing:
  port: 50000
auth:
  type: UNRESOLVED

Traits

- powerable
- routable
- queryable
- levelable

Actions

- id: power
  label: Power
  kind: action
  params:
    - name: state
      type: enum
      values:
        - "0xF0" # Request power state
    - name: zone
      type: integer
      description: Zone number (1 or 2)
- id: display_brightness
  label: Display Brightness
  kind: action
  params:
    - name: level
      type: enum
      values:
        - "0x00" # Off
        - "0x01" # L1
        - "0x02" # L2
        - "0xF0" # Request current brightness
- id: headphones_status
  label: Headphones Status
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request current status
- id: fm_genre
  label: FM Genre
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request current genre
- id: software_version
  label: Software Version
  kind: action
  params:
    - name: type
      type: enum
      values:
        - "0xF0" # RS232 version
        - "0xF1" # Host version
        - "0xF2" # OSD version
        - "0xF3" # DSP version
        - "0xF4" # NET version
        - "0xF5" # IAP version
- id: factory_restore
  label: Factory Restore
  kind: action
  params:
    - name: confirm
      type: string
      description: Confirmation pattern 0xAA 0xAA
- id: secure_copy
  label: Save/Restore Secure Copy
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0x00" # Save secure backup
        - "0x01" # Restore secure backup
    - name: confirm
      type: string
      description: Confirmation pattern 0x55 0x55
    - name: pin
      type: string
      description: 4-digit PIN
- id: simulate_rc5
  label: Simulate RC5 IR Command
  kind: action
  params:
    - name: system_code
      type: integer
      description: RC5 system code
    - name: command_code
      type: integer
      description: RC5 command code
- id: display_info_type
  label: Display Information Type
  kind: action
  params:
    - name: type
      type: enum
      values:
        - "0x00" # Processing mode
        - "0xE0" # Cycle through all
        - "0xF0" # Request current display type
        - "0x01" # FM Radio text
        - "0x02" # FM Programme type
        - "0x03" # FM Signal strength
        - "0x01" # DAB Radio text
        - "0x02" # DAB Genre
        - "0x03" # DAB Signal quality
        - "0x04" # DAB Bit rate
        - "0x01" # NET/USB Track
        - "0x02" # NET/USB Artist
        - "0x03" # NET/USB Album
        - "0x04" # NET/USB audio type
        - "0x05" # NET/USB rate
- id: video_selection
  label: Video Selection
  kind: action
  params:
    - name: source
      type: enum
      values:
        - "0x00" # BD
        - "0x01" # SAT
        - "0x02" # AV
        - "0x03" # PVR
        - "0x04" # VCR
        - "0x05" # Game
        - "0x06" # STB
        - "0xF0" # Request current input
- id: audio_input_select
  label: Select Analogue/Digital Audio Input
  kind: action
  params:
    - name: input
      type: enum
      values:
        - "0x00" # Analogue
        - "0x01" # Digital
        - "0x02" # HDMI
        - "0xF0" # Request current audio type
- id: imax_enhanced
  label: IMAX Enhanced
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request current state
        - "0xF1" # Auto
        - "0xF2" # On
        - "0xF3" # Off
- id: volume
  label: Set/Request Volume
  kind: action
  params:
    - name: level
      type: integer
      description: Volume 0-99, or 0xF0 to query
- id: mute_status
  label: Request Mute Status
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request mute status
- id: direct_mode_status
  label: Request Direct Mode Status
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request mode setting
- id: decode_mode_2ch
  label: Request Decode Mode 2ch
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request decode mode
- id: decode_mode_mch
  label: Request Decode Mode MCH
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request decode mode
- id: rds_information
  label: Request RDS Information
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request RDS info (FM)
- id: video_output_resolution
  label: Request Video Output Resolution
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request video output
- id: menu_status
  label: Request Menu Status
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request open menu state
- id: tuner_preset
  label: Request Tuner Preset
  kind: action
  params:
    - name: preset
      type: integer
      description: "1-50, or 0xF0 to request current"
- id: tune
  label: Tune
  kind: action
  params:
    - name: direction
      type: enum
      values:
        - "0x00" # Decrement
        - "0x01" # Increment
        - "0xF0" # Request current frequency
- id: dab_station
  label: Request DAB Station
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request current DAB station
- id: dab_program_type
  label: DAB Program Type/Category
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request program type
- id: dab_dls_info
  label: DLS/PDT Information
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request DLS info (DAB)
- id: preset_details
  label: Request Preset Details
  kind: action
  params:
    - name: preset_number
      type: integer
      description: Preset number 1-50
- id: network_playback_status
  label: Network Playback Status
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request playback status
- id: current_source
  label: Request Current Source
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request current source
- id: headphone_override
  label: Headphone Over-ride
  kind: action
  params:
    - name: state
      type: enum
      values:
        - "0x00" # Clear (mute speakers if headphones present)
        - "0x01" # Set (unmute speakers if headphones present)
- id: input_name
  label: Set/Request Input Name
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Query input name
    - name: name
      type: string
      description: ASCII name (up to 10 characters for setting)
- id: fm_scan
  label: FM Scan
  kind: action
  params:
    - name: direction
      type: enum
      values:
        - "0x01" # Scan up
        - "0x02" # Scan down
- id: dab_scan
  label: DAB Scan
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Start DAB scan
- id: heartbeat
  label: Heartbeat
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Heartbeat
- id: reboot
  label: Reboot
  kind: action
  params:
    - name: confirm
      type: string
      description: Confirmation string "REBOOT"
- id: treble_eq
  label: Treble Equalisation
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00-0x0C: 0dB to +12dB, 0x81-0x8C: -1dB to -12dB, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: bass_eq
  label: Bass Equalisation
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00-0x0C: 0dB to +12dB, 0x81-0x8C: -1dB to -12dB, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: room_eq
  label: Room Equalisation
  kind: action
  params:
    - name: state
      type: enum
      values:
        - "0xF0" # Request current state
        - "0xF1" # Room EQ on
        - "0xF2" # Room EQ off
- id: dolby_volume
  label: Dolby Volume
  kind: action
  params:
    - name: state
      type: enum
      values:
        - "0x00" # Off
        - "0x01" # On
        - "0xF0" # Request current mode
- id: dolby_leveller
  label: Dolby Leveller
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00-0x0A: 0-10, 0xFF: off, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: dolby_volume_offset
  label: Dolby Volume Calibration Offset
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00-0x0F: 0 to +15dB, 0x80-0x8F: -1 to -15dB, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: balance
  label: Balance
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00-0x06: 0 to +6, 0x81-0x86: -1 to -6, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: subwoofer_trim
  label: Subwoofer Trim
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00-0x14: positive in 0.5dB steps, 0x81-0x94: negative in 0.5dB steps, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: lipsync_delay
  label: Lipsync Delay
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00-0x32: delay in 5ms steps, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: compression
  label: Compression
  kind: action
  params:
    - name: level
      type: enum
      values:
        - "0x00" # Off
        - "0x01" # Medium
        - "0x02" # High
        - "0xF0" # Request current setting
- id: incoming_video_params
  label: Request Incoming Video Parameters
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request video parameters
- id: incoming_audio_format
  label: Request Incoming Audio Format
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request audio format
- id: incoming_audio_sample_rate
  label: Request Incoming Audio Sample Rate
  kind: action
  params:
    - name: mode
      type: enum
      values:
        - "0xF0" # Request sample rate
- id: sub_stereo_trim
  label: Set/Request Sub Stereo Trim
  kind: action
  params:
    - name: value
      type: integer
      description: "0x00: 0dB, 0x81-0x94: -0.5dB to -10dB in 0.5dB steps, 0xF0: request, 0xF1: increment, 0xF2: decrement"
- id: zone1_osd
  label: Set/Request Zone 1 OSD
  kind: action
  params:
    - name: state
      type: enum
      values:
        - "0xF0" # Request current state
        - "0xF1" # On
        - "0xF2" # Off
- id: video_output_switching
  label: Set/Request Video Output Switching
  kind: action
  params:
    - name: output
      type: enum
      values:
        - "0x02" # HDMI Output 1
        - "0x03" # HDMI Output 2
        - "0x04" # HDMI Output 1 & 2
        - "0xF0" # Request current setting

Feedbacks

- id: power_feedback
  type: enum
  values:
    - "0x00" # Standby
    - "0x01" # Powered on
- id: display_brightness_feedback
  type: enum
  values:
    - "0x00" # Front panel off
    - "0x01" # Front panel L1
    - "0x02" # Front panel L2
- id: headphones_feedback
  type: enum
  values:
    - "0x00" # Not connected
    - "0x01" # Connected
- id: fm_genre_feedback
  type: string
  description: ASCII string of program type
- id: software_version_feedback
  type: string
  description: Echo of request type + major.minor version
- id: factory_restore_feedback
  type: enum
  values:
    - "0x00" # Success
- id: secure_copy_feedback
  type: enum
  values:
    - "0x00" # Success
    - "0x85" # Error (no secure copy or save in progress)
- id: rc5_feedback
  type: enum
  values:
    - "0x00" # Success
- id: display_info_feedback
  type: enum
  values:
    - "0x00" # Processing mode
    - "0x01" # Radio text / Track / etc.
- id: video_selection_feedback
  type: enum
  values:
    - "0x00" # BD
    - "0x01" # SAT
    - "0x02" # AV
    - "0x03" # PVR
    - "0x04" # VCR
    - "0x05" # Game
    - "0x06" # STB
- id: audio_input_feedback
  type: enum
  values:
    - "0x00" # Analogue
    - "0x01" # Digital
    - "0x02" # HDMI
- id: imax_feedback
  type: enum
  values:
    - "0x00" # Off
    - "0x01" # On
    - "0x02" # Auto
- id: volume_feedback
  type: integer
  description: Volume 0-99
- id: mute_feedback
  type: enum
  values:
    - "0x00" # Muted
    - "0x01" # Not muted
- id: direct_mode_feedback
  type: enum
  values:
    - "0x00" # Off
    - "0x01" # On
- id: decode_mode_2ch_feedback
  type: enum
  values:
    - "0x01" # Stereo
    - "0x04" # Dolby Surround
    - "0x07" # Neo:6 Cinema
    - "0x08" # Neo:6 Music
    - "0x09" # 5/7 Ch Stereo
    - "0x0A" # DTS Neural:X
    - "0x0B" # Logic7 Immersion
    - "0x0C" # DTS Virtual:X
- id: decode_mode_mch_feedback
  type: enum
  values:
    - "0x01" # Stereo down-mix
    - "0x02" # Multi-channel mode
    - "0x03" # DTS-ES / Neural:X mode
    - "0x06" # Dolby Surround mode
    - "0x0B" # Logic7 Immersion
    - "0x0C" # DTS Virtual:X
- id: rds_feedback
  type: string
  description: ASCII string
- id: video_resolution_feedback
  type: enum
  values:
    - "0x02" # SD Progressive
    - "0x03" # 720p
    - "0x04" # 1080i
    - "0x05" # 1080p
    - "0x06" # Preferred
    - "0x07" # Bypass
    - "0x08" # 4k
- id: menu_status_feedback
  type: enum
  values:
    - "0x00" # No menu open
    - "0x02" # Set-up Menu
    - "0x03" # Trim Menu
    - "0x04" # Bass Menu
    - "0x05" # Treble Menu
    - "0x06" # Sync Menu
    - "0x07" # Sub Menu
    - "0x08" # Tuner Menu
    - "0x09" # Network menu
    - "0x0A" # USB Menu
- id: tuner_preset_feedback
  type: integer
  description: "0xFF if no preset, 0x01-0x32 for preset 1-50"
- id: tune_feedback
  type: string
  description: Frequency in MHz
- id: dab_station_feedback
  type: string
  description: 16-byte ASCII station name padded with spaces
- id: dab_program_type_feedback
  type: string
  description: 16-byte ASCII program type padded with spaces
- id: dab_dls_feedback
  type: string
  description: 128-byte ASCII DLS text padded with spaces
- id: preset_details_feedback
  type: string
  description: Preset number, frequency/name data
- id: network_playback_feedback
  type: enum
  values:
    - "0x00" # Navigating
    - "0x01" # Playing
    - "0x02" # Paused
    - "0xFF" # Busy/Not Playing
- id: current_source_feedback
  type: enum
  values:
    - "0x00" # Follow Zone 1
    - "0x01" # CD
    - "0x02" # BD
    - "0x03" # AV
    - "0x04" # SAT
    - "0x05" # PVR
    - "0x06" # VCR
    - "0x08" # AUX
    - "0x09" # DISPLAY
    - "0x0B" # TUNER FM
    - "0x0C" # TUNER DAB
    - "0x0E" # NET
    - "0x0F" # USB
    - "0x10" # STB
    - "0x11" # GAME
- id: headphone_override_feedback
  type: enum
  values:
    - "0x00" # Clear
    - "0x01" # Set
- id: input_name_feedback
  type: string
  description: Input name in ASCII
- id: fm_scan_feedback
  type: enum
  values:
    - "0xFF" # Scanning
- id: dab_scan_feedback
  type: enum
  values:
    - "0xFF" # Scanning
- id: heartbeat_feedback
  type: enum
  values:
    - "0x00" # Response
- id: reboot_feedback
  type: enum
  values:
    - "0x00" # Response
- id: treble_eq_feedback
  type: integer
  description: "0x00-0x0C: 0dB to +12dB, 0x81-0x8C: -1dB to -12dB"
- id: bass_eq_feedback
  type: integer
  description: "0x00-0x0C: 0dB to +12dB, 0x81-0x8C: -1dB to -12dB"
- id: room_eq_feedback
  type: enum
  values:
    - "0x00" # Off
    - "0x01" # On
    - "0x02" # Not calculated
- id: dolby_volume_feedback
  type: enum
  values:
    - "0x00" # Off
    - "0x01" # On
- id: dolby_leveller_feedback
  type: integer
  description: "0x00-0x0A: level, 0xFF: off"
- id: dolby_volume_offset_feedback
  type: integer
  description: "0x00-0x0F: 0 to +15dB, 0x80-0x8F: -1 to -15dB"
- id: balance_feedback
  type: integer
  description: "0x00-0x06: 0 to +6, 0x81-0x86: -1 to -6"
- id: subwoofer_trim_feedback
  type: integer
  description: "0x00-0x14: positive in 0.5dB steps, 0x81-0x94: negative"
- id: lipsync_delay_feedback
  type: integer
  description: "0x00-0x32: delay in 5ms steps"
- id: compression_feedback
  type: enum
  values:
    - "0x00" # Off
    - "0x01" # Medium
    - "0x02" # High
- id: incoming_video_params_feedback
  type: string
  description: H-res, V-res, refresh, interlaced flag, aspect ratio
- id: incoming_audio_format_feedback
  type: string
  description: Audio stream format and channel configuration
- id: incoming_audio_sample_rate_feedback
  type: enum
  values:
    - "0x00" # 32 KHz
    - "0x01" # 44.1 KHz
    - "0x02" # 48 KHz
    - "0x03" # 88.2 KHz
    - "0x04" # 96 KHz
    - "0x05" # 176.4 KHz
    - "0x06" # 192 KHz
    - "0x07" # Unknown
    - "0x08" # Undetected
- id: sub_stereo_trim_feedback
  type: integer
  description: "0x00, 0x81-0x94: -0.5dB to -10dB in 0.5dB steps"
- id: zone1_osd_feedback
  type: enum
  values:
    - "0x00" # On
    - "0x01" # Off
- id: video_output_switching_feedback
  type: enum
  values:
    - "0x02" # HDMI Output 1
    - "0x03" # HDMI Output 2
    - "0x04" # HDMI Output 1 & 2

Variables

# All settable parameters are represented as Actions with 0xF0 query variant

Events

# The device sends state change notifications unsolicited:
# - Display brightness changes via front panel
# - Decode mode changes
# - All state changes from IR or front panel are relayed to RC
# UNRESOLVED: Full event notification catalog not explicitly documented

Macros

# No explicit multi-step macros documented

Safety

confirmation_required_for:
  - factory_restore (requires 0xAA 0xAA confirmation pattern)
  - secure_copy_restore (requires PIN code)
  - reboot (requires "REBOOT" string)
interlocks: []

Notes

IP control is via port 50000. AMX Duet DDDP discovery supported with device class Receiver. RC5 IR commands can be simulated via command 0x08. Commands 0xF0-0xFF are reserved for test functions. Some commands return error 0x85 when OSD is displayed or when wrong source is selected (e.g., tuner commands when not on tuner input).

Provenance

source_domains:
  - lexicon.com
source_urls:
  - https://www.lexicon.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwd2bbdf85/pdfs/RS232_Protocol_Documentation.pdf
retrieved_at: 2026-10-07T12:47:59.650Z
last_checked_at: 2026-10-07T12:47:59.650Z

Verification Summary

verdict: verified
checked_at: 2026-10-07T12:47:59.650Z
matched_actions: 50
action_count: 50
confidence: medium
summary: "All 50 semantic-id actions map one-to-one to documented command codes with agreeing value shapes; serial and port 50000 transport values are supported by the source. (6 unresolved item(s) noted in Known Gaps.)"

Known Gaps

- "multi-zone details beyond zone 1 and 2 not fully documented"
- "Full event notification catalog not explicitly documented"
- "Full list of sources for current_source feedback (only those explicitly listed in 0x1D response section)"
- "Network protocol details beyond port 50000"
- "Zone 2+ detailed command support"
- "Firmware version compatibility ranges"

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