NEC NP-PX Series RS-232 / IP control commands

Summary

The NEC NP-PX Series is a family of professional projectors controllable via RS-232C serial or wired LAN (TCP). The protocol is binary, using hex byte sequences with a checksum trailer. This spec covers power control, input switching, picture/sound/onscreen muting, volume and picture adjustment, lens control (zoom, focus, shift), shutter, freeze, eco mode, edge blending, PIP, and extensive status/query commands.

Transport

protocols:
  - serial
  - tcp
serial:
  baud_rate: [115200, 38400, 19200, 9600, 4800]  # UNRESOLVED: default baud rate not stated
  data_bits: 8
  parity: none
  stop_bits: 1
  flow_control: none  # UNRESOLVED: RTS/CTS wiring shown but software flow control not specified
addressing:
  port: 7142  # TCP port for LAN command interface
auth:
  type: none  # inferred: no auth procedure in source

Traits

- powerable       # power on (015) / power off (016) commands
- routable        # input switch change (018) command
- queryable       # extensive request commands (037, 060-1, 078-*, 084, 097-*, 305-*)
- levelable       # volume adjust (030-2), picture adjust (030-1), lamp adjust (030-15)
- muteable        # picture mute (020/021), sound mute (022/023), onscreen mute (024/025)

Actions

- id: power_on
  label: Power On
  kind: action
  command: "02h 00h 00h 00h 00h 02h"
  description: "Turns on the projector power. No other commands accepted during power-on sequence."
  params: []

- id: power_off
  label: Power Off
  kind: action
  command: "02h 01h 00h 00h 00h 03h"
  description: "Turns off the projector power. No other commands accepted during power-off and cooling."
  params: []

- id: input_switch
  label: Input Switch Change
  kind: action
  command: "02h 03h 00h 00h 02h 01h <DATA01> <CKS>"
  description: "Switches the input terminal or entry list."
  params:
    - name: input_terminal
      type: integer
      description: "Input terminal code (hex). Values vary by model - see supplementary input terminal table."

- id: picture_mute_on
  label: Picture Mute On
  kind: action
  command: "02h 10h 00h 00h 00h 12h"
  description: "Turns picture mute on. Automatically cancelled on input/signal switch."
  params: []

- id: picture_mute_off
  label: Picture Mute Off
  kind: action
  command: "02h 11h 00h 00h 00h 13h"
  description: "Turns picture mute off."
  params: []

- id: sound_mute_on
  label: Sound Mute On
  kind: action
  command: "02h 12h 00h 00h 00h 14h"
  description: "Turns sound mute on. Automatically cancelled on input/signal switch or volume adjust."
  params: []

- id: sound_mute_off
  label: Sound Mute Off
  kind: action
  command: "02h 13h 00h 00h 00h 15h"
  description: "Turns sound mute off."
  params: []

- id: onscreen_mute_on
  label: Onscreen Mute On
  kind: action
  command: "02h 14h 00h 00h 00h 16h"
  description: "Turns onscreen mute on. Automatically cancelled on input/signal switch."
  params: []

- id: onscreen_mute_off
  label: Onscreen Mute Off
  kind: action
  command: "02h 15h 00h 00h 00h 17h"
  description: "Turns onscreen mute off."
  params: []

- id: picture_adjust
  label: Picture Adjust
  kind: action
  command: "03h 10h 00h 00h 05h <DATA01> FFh <DATA02> <DATA03> <DATA04> <CKS>"
  description: "Adjusts picture parameters (brightness, contrast, color, hue, sharpness)."
  params:
    - name: target
      type: integer
      description: "00h=Brightness, 01h=Contrast, 02h=Color, 03h=Hue, 04h=Sharpness"
    - name: mode
      type: integer
      description: "00h=Absolute value, 01h=Relative value"
    - name: value
      type: integer
      description: "16-bit adjustment value (low byte, high byte)"

- id: volume_adjust
  label: Volume Adjust
  kind: action
  command: "03h 10h 00h 00h 05h 05h 00h <DATA01> <DATA02> <DATA03> <CKS>"
  description: "Adjusts sound volume."
  params:
    - name: mode
      type: integer
      description: "00h=Absolute value, 01h=Relative value"
    - name: value
      type: integer
      description: "16-bit adjustment value (low byte, high byte)"

- id: aspect_adjust
  label: Aspect Adjust
  kind: action
  command: "03h 10h 00h 00h 05h 18h 00h 00h <DATA01> 00h <CKS>"
  description: "Sets aspect ratio. Values vary by model."
  params:
    - name: aspect
      type: integer
      description: "Aspect value code - see supplementary aspect table per model"

- id: lamp_adjust
  label: Lamp/Light Adjust
  kind: action
  command: "03h 10h 00h 00h 05h <DATA01> <DATA02> <DATA03> <DATA04> <DATA05> <CKS>"
  description: "Adjusts lamp/light output."
  params:
    - name: target
      type: integer
      description: "DATA01=96h, DATA02=FFh for Lamp Adjust / Light Adjust"
    - name: mode
      type: integer
      description: "00h=Absolute value, 01h=Relative value"
    - name: value
      type: integer
      description: "16-bit adjustment value (low byte, high byte)"

- id: remote_key_code
  label: Remote Key Code
  kind: action
  command: "02h 0Fh 00h 00h 02h <DATA01> <DATA02> <CKS>"
  description: "Sends a remote control key code (WORD type)."
  params:
    - name: key_code
      type: integer
      description: "WORD key code (low byte, high byte). E.g. 02h 00h=POWER ON, 05h 00h=AUTO, 06h 00h=MENU, 07h 00h=UP, 08h 00h=DOWN, 09h 00h=RIGHT, 0Ah 00h=LEFT, 0Bh 00h=ENTER, 0Ch 00h=EXIT"

- id: shutter_close
  label: Shutter Close
  kind: action
  command: "02h 16h 00h 00h 00h 18h"
  description: "Closes the lens shutter."
  params: []

- id: shutter_open
  label: Shutter Open
  kind: action
  command: "02h 17h 00h 00h 00h 19h"
  description: "Opens the lens shutter."
  params: []

- id: lens_control
  label: Lens Control
  kind: action
  command: "02h 18h 00h 00h 02h <DATA01> <DATA02> <CKS>"
  description: "Adjusts lens position (zoom, focus, lens shift H/V, periphery focus)."
  params:
    - name: target
      type: integer
      description: "00h=Zoom, 01h=Focus, 02h=Lens Shift H, 03h=Lens Shift V, 06h=Periphery Focus"
    - name: content
      type: integer
      description: "00h=Stop, 01h=+1s, 02h=+0.5s, 03h=+0.25s, 7Fh=+continuous, 81h=-continuous, FDh=-0.25s, FEh=-0.5s, FFh=-1s"

- id: lens_control_2
  label: Lens Control 2 (Absolute/Relative)
  kind: action
  command: "02h 1Dh 00h 00h 04h <DATA01> <DATA02> <DATA03> <DATA04> <CKS>"
  description: "Adjusts lens position with absolute or relative values."
  params:
    - name: target
      type: integer
      description: "00h=Zoom, 01h=Focus, 02h=Lens Shift H, 03h=Lens Shift V, FFh=Stop"
    - name: mode
      type: integer
      description: "00h=Absolute, 02h=Relative"
    - name: value
      type: integer
      description: "16-bit adjustment value (low byte, high byte)"

- id: lens_memory_control
  label: Lens Memory Control
  kind: action
  command: "02h 1Eh 00h 00h 01h <DATA01> <CKS>"
  description: "Controls lens memory (move/store/reset)."
  params:
    - name: operation
      type: integer
      description: "00h=MOVE, 01h=STORE, 02h=RESET"

- id: reference_lens_memory_control
  label: Reference Lens Memory Control
  kind: action
  command: "02h 1Fh 00h 00h 01h <DATA01> <CKS>"
  description: "Controls reference lens memory for the active profile."
  params:
    - name: operation
      type: integer
      description: "00h=MOVE, 01h=STORE, 02h=RESET"

- id: lens_memory_option_set
  label: Lens Memory Option Set
  kind: action
  command: "02h 21h 00h 00h 02h <DATA01> <DATA02> <CKS>"
  description: "Sets lens memory options (load by signal, forced mute)."
  params:
    - name: target
      type: integer
      description: "00h=LOAD BY SIGNAL, 01h=FORCED MUTE"
    - name: value
      type: integer
      description: "00h=OFF, 01h=ON"

- id: lens_profile_set
  label: Lens Profile Set
  kind: action
  command: "02h 27h 00h 00h 01h <DATA01> <CKS>"
  description: "Selects the reference lens memory profile number."
  params:
    - name: profile
      type: integer
      description: "00h=Profile 1, 01h=Profile 2"

- id: freeze_control
  label: Freeze Control
  kind: action
  command: "01h 98h 00h 00h 01h <DATA01> <CKS>"
  description: "Turns freeze function on or off."
  params:
    - name: operation
      type: integer
      description: "01h=On, 02h=Off"

- id: eco_mode_set
  label: Eco Mode Set
  kind: action
  command: "03h B1h 00h 00h 02h 07h <DATA01> <CKS>"
  description: "Sets eco/lamp mode. Values vary by model."
  params:
    - name: mode
      type: integer
      description: "Eco mode value - see supplementary eco mode table per model"

- id: lan_projector_name_set
  label: LAN Projector Name Set
  kind: action
  command: "03h B1h 00h 00h 12h 2Ch <DATA01-16> 00h <CKS>"
  description: "Sets the projector name (up to 16 bytes)."
  params:
    - name: name
      type: string
      description: "Projector name (up to 16 bytes, NUL terminated)"

- id: pip_pbp_set
  label: PIP/Picture by Picture Set
  kind: action
  command: "03h B1h 00h 00h 03h C5h <DATA01> <DATA02> <CKS>"
  description: "Sets PIP or Picture by Picture mode and options."
  params:
    - name: target
      type: integer
      description: "00h=MODE, 01h=START POSITION, 02h=SUB INPUT 1, 09h=SUB INPUT 2, 0Ah=SUB INPUT 3"
    - name: value
      type: integer
      description: "MODE: 00h=PIP, 01h=PbP; POSITION: 00h=TL, 01h=TR, 02h=BL, 03h=BR"

- id: edge_blending_set
  label: Edge Blending Mode Set
  kind: action
  command: "03h B1h 00h 00h 03h DFh 00h <DATA01> <CKS>"
  description: "Enables or disables edge blending."
  params:
    - name: value
      type: integer
      description: "00h=OFF, 01h=ON"

- id: audio_select_set
  label: Audio Select Set
  kind: action
  command: "03h C9h 00h 00h 03h 09h <DATA01> <DATA02> <CKS>"
  description: "Sets the audio input source for a given input terminal."
  params:
    - name: input_terminal
      type: integer
      description: "Input terminal code"
    - name: audio_source
      type: integer
      description: "00h=Same as input terminal, 01h=BNC, 02h=COMPUTER"

Feedbacks

- id: error_status
  label: Error Status
  kind: feedback
  command: "00h 88h 00h 00h 00h 88h"
  response_bytes: 12
  description: "Returns 12 bytes of error bitflags (cover, fan, temperature, lamp, power, formatter, mirror cover, ballast, iris, lens, interlock, system errors)."

- id: projector_information
  label: Projector Information
  kind: feedback
  command: "03h 8Ah 00h 00h 00h 8Dh"
  response_bytes: 98
  description: "Returns projector name (bytes 1-49), lamp usage time in seconds (bytes 83-86), filter usage time in seconds (bytes 87-90)."

- id: filter_usage
  label: Filter Usage Information
  kind: feedback
  command: "03h 95h 00h 00h 00h 98h"
  response_bytes: 8
  description: "Returns filter usage time (seconds, bytes 1-4) and filter alarm start time (seconds, bytes 5-8)."

- id: lamp_information
  label: Lamp Information
  kind: feedback
  command: "03h 96h 00h 00h 02h <DATA01> <DATA02> <CKS>"
  response_bytes: 6
  description: "Returns lamp usage time or remaining life. DATA01: 00h=Lamp1, 01h=Lamp2. DATA02: 01h=usage time (s), 04h=remaining life (%)."

- id: carbon_savings
  label: Carbon Savings Information
  kind: feedback
  command: "03h 9Ah 00h 00h 01h <DATA01> <CKS>"
  response_bytes: 9
  description: "Returns carbon savings in kg (bytes 2-5) and mg (bytes 6-9). DATA01: 00h=total, 01h=during operation."

- id: running_status
  label: Running Status
  kind: feedback
  command: "00h 85h 00h 00h 01h 01h 87h"
  response_bytes: 16
  description: "Returns power status (DATA03: 00h=standby, 01h=on), cooling status, power on/off process status, operation status."

- id: input_status
  label: Input Status
  kind: feedback
  command: "00h 85h 00h 00h 01h 02h 88h"
  response_bytes: 16
  description: "Returns signal switch process, signal list number, selection signal type 1/2, signal list type, test pattern, content displayed."

- id: mute_status
  label: Mute Status
  kind: feedback
  command: "00h 85h 00h 00h 01h 03h 89h"
  response_bytes: 16
  description: "Returns picture mute (DATA01), sound mute (DATA02), onscreen mute (DATA03), forced onscreen mute (DATA04), onscreen display (DATA05). 00h=Off, 01h=On, FFh=Not supported."

- id: model_name
  label: Model Name
  kind: feedback
  command: "00h 85h 00h 00h 01h 04h 8Ah"
  response_bytes: 32
  description: "Returns model name as NUL-terminated string (bytes 1-32)."

- id: cover_status
  label: Cover Status
  kind: feedback
  command: "00h 85h 00h 00h 01h 05h 8Bh"
  response_bytes: 1
  description: "Returns cover status. 00h=Normal (cover opened), 01h=Cover closed."

- id: gain_parameter
  label: Gain Parameter
  kind: feedback
  command: "03h 05h 00h 00h 03h <DATA01> 00h 00h <CKS>"
  response_bytes: 16
  description: "Returns adjustment range and current value for picture/volume/lamp parameters. DATA01: 00h=Brightness, 01h=Contrast, 02h=Color, 03h=Hue, 04h=Sharpness, 05h=Volume, 96h=Lamp Adjust."

- id: lens_position
  label: Lens Position
  kind: feedback
  command: "02h 1Ch 00h 00h 02h <DATA01> 00h <CKS>"
  response_bytes: 7
  description: "Returns lens position range and current value. DATA01: 00h=Zoom, 01h=Focus, 02h=Lens Shift H, 03h=Lens Shift V."

- id: lens_memory_option
  label: Lens Memory Option
  kind: feedback
  command: "02h 20h 00h 00h 01h <DATA01> <CKS>"
  response_bytes: 2
  description: "Returns lens memory option value. DATA01: 00h=LOAD BY SIGNAL, 01h=FORCED MUTE. Response: 00h=OFF, 01h=ON."

- id: lens_information
  label: Lens Information
  kind: feedback
  command: "02h 22h 00h 00h 01h 00h 25h"
  response_bytes: 1
  description: "Returns lens operation status bitflags. Bit0=Lens memory, Bit1=Zoom, Bit2=Focus, Bit3=Lens Shift H, Bit4=Lens Shift V. 0=Stop, 1=During operation."

- id: lens_profile
  label: Lens Profile
  kind: feedback
  command: "02h 28h 00h 00h 00h 2Ah"
  response_bytes: 2
  description: "Returns selected reference lens memory profile. DATA01: 00h=Profile 1, 01h=Profile 2."

- id: information_string
  label: Information String
  kind: feedback
  command: "00h D0h 00h 00h 03h 00h <DATA01> 01h <CKS>"
  description: "Returns info strings. DATA01: 03h=Horizontal sync frequency, 04h=Vertical sync frequency."

- id: eco_mode
  label: Eco Mode
  kind: feedback
  command: "03h B0h 00h 00h 01h 07h BBh"
  response_bytes: 1
  description: "Returns current eco/lamp mode value. Values vary by model."

- id: lan_projector_name
  label: LAN Projector Name
  kind: feedback
  command: "03h B0h 00h 00h 01h 2Ch E0h"
  response_bytes: 17
  description: "Returns projector name as NUL-terminated string (up to 17 bytes)."

- id: mac_address
  label: MAC Address
  kind: feedback
  command: "03h B0h 00h 00h 02h 9Ah 00h 4Fh"
  response_bytes: 6
  description: "Returns MAC address (6 bytes)."

- id: pip_pbp_status
  label: PIP/Picture by Picture Status
  kind: feedback
  command: "03h B0h 00h 00h 02h C5h <DATA01> <CKS>"
  response_bytes: 2
  description: "Returns PIP/PbP setting. DATA01: 00h=MODE, 01h=START POSITION, 02h=SUB INPUT 1, 09h=SUB INPUT 2, 0Ah=SUB INPUT 3."

- id: edge_blending_status
  label: Edge Blending Mode Status
  kind: feedback
  command: "03h B0h 00h 00h 02h DFh 00h 94h"
  response_bytes: 1
  description: "Returns edge blending status. 00h=OFF, 01h=ON."

- id: setting_request
  label: Setting Information
  kind: feedback
  command: "00h 85h 00h 00h 01h 00h 86h"
  response_bytes: 32
  description: "Returns base model type (bytes 1-3), sound function (byte 4), profile number (byte 5)."

- id: base_model_type
  label: Base Model Type
  kind: feedback
  command: "00h BFh 00h 00h 01h 00h C0h"
  response_bytes: 15
  description: "Returns base model type (bytes 1-2), model name (bytes 3-11, NUL terminated), base model type (bytes 12-13)."

- id: serial_number
  label: Serial Number
  kind: feedback
  command: "00h BFh 00h 00h 02h 01h 06h C8h"
  response_bytes: 16
  description: "Returns serial number as NUL-terminated string."

- id: basic_information
  label: Basic Information
  kind: feedback
  command: "00h BFh 00h 00h 01h 02h C2h"
  response_bytes: 15
  description: "Returns operation status, content displayed, signal type 1/2, display signal type, video/sound/onscreen mute, freeze status."

Variables

- id: brightness
  label: Brightness
  type: integer
  min: null  # UNRESOLVED: min/max values not stated in source, queryable via gain parameter request
  max: null
  description: "Picture brightness. Adjustable via 030-1 (target 00h). Range queryable via 060-1."

- id: contrast
  label: Contrast
  type: integer
  min: null
  max: null
  description: "Picture contrast. Adjustable via 030-1 (target 01h)."

- id: color
  label: Color
  type: integer
  min: null
  max: null
  description: "Picture color saturation. Adjustable via 030-1 (target 02h)."

- id: hue
  label: Hue
  type: integer
  min: null
  max: null
  description: "Picture hue. Adjustable via 030-1 (target 03h)."

- id: sharpness
  label: Sharpness
  type: integer
  min: null
  max: null
  description: "Picture sharpness. Adjustable via 030-1 (target 04h)."

- id: volume
  label: Volume
  type: integer
  min: null
  max: null
  description: "Sound volume. Adjustable via 030-2."

- id: lamp_output
  label: Lamp Output
  type: integer
  min: null
  max: null
  description: "Lamp/light output level. Adjustable via 030-15 (target 96h FFh)."

- id: eco_mode_value
  label: Eco Mode
  type: enum
  values: []  # UNRESOLVED: values vary by model, see supplementary eco mode table
  description: "Eco/lamp operating mode. Set via 098-8, query via 097-8."

Events

# UNRESOLVED: no unsolicited notification / event push mechanism described in source.
# All responses are command-response (synchronous). No async event subscription documented.

Macros

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

Safety

confirmation_required_for: []
interlocks: []
notes: >
  Power on (015) blocks all other commands during the power-on sequence.
  Power off (016) blocks all other commands during power-off including the cooling period.
  The error status request (009) returns interlock switch status (DATA09 Bit1: open/closed)
  and cover error (DATA01 Bit0) which may indicate safety interlock conditions.
# UNRESOLVED: no explicit safety warnings, power-on sequencing requirements, or
# interlock procedures documented beyond the blocking behavior during power transitions.

Notes

The protocol is entirely binary (hex byte sequences). Commands include fixed bytes plus variable parameters <ID1>, <ID2> (control ID and model code), and <CKS> (checksum — low byte of sum of all preceding bytes).
All responses start with the command byte OR'd with 20h (success) or A0h (failure). Failure responses include ERR1/ERR2 error codes.
Error codes are defined in section 2.4 with specific combinations for unrecognized commands, unsupported commands, invalid values, memory errors, power-off state, etc.
Some models cannot receive commands in standby mode. Standby mode settings vary by model (see standby mode table in source).
Input terminal codes, aspect values, and eco mode values all vary by model — supplementary tables are provided in the source but NP-PX-specific entries are absent.
Lamp usage time is updated at one-minute intervals despite being returned in seconds.
Picture mute, sound mute, and onscreen mute are automatically cancelled on input/signal switch. Sound mute is also cancelled on volume adjustment.

Provenance

source_domains: []
source_urls: []
retrieved_at: 2026-06-02T22:11:09.102Z
last_checked_at: 2026-06-02T22:11:09.102Z

Verification Summary

verdict: verified
checked_at: 2026-06-02T22:11:09.102Z
matched_actions: 28
action_count: 28
confidence: medium
summary: "All 28 spec actions traced to source (dip-safe re-verify). (17 unresolved item(s) noted in Known Gaps.)"

Known Gaps

- "exact NP-PX model variants not listed in source; source covers multiple NEC projector families (NP4100, NP-Mxxx, NP-MExxx, NP-MCxxx). Specific NP-PX model names and input terminal codes are not documented."
- "no firmware version compatibility ranges stated"
- "command timing constraints beyond \"no other command accepted during power on/off\" not documented"
- "appendix \"Supplementary Information by Command\" values for input terminal, aspect, eco mode per model are partially listed but NP-PX-specific values are absent"
- "default baud rate not stated"
- "RTS/CTS wiring shown but software flow control not specified"
- "min/max values not stated in source, queryable via gain parameter request"
- "values vary by model, see supplementary eco mode table"
- "no unsolicited notification / event push mechanism described in source."
- "no multi-step macro sequences described in source"
- "no explicit safety warnings, power-on sequencing requirements, or"
- "NP-PX-specific input terminal codes not in source"
- "NP-PX-specific aspect values not in source"
- "NP-PX-specific eco mode values not in source"
- "default values for all gain parameters not stated"
- "command response timeout not documented"
- "maximum command rate / minimum inter-command delay not documented"
- "model-specific source not located"

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

NEC NP-PX Series Control Spec