NEC C750Q RS-232 / IP control commands

Summary

Professional laser projector supporting both serial (RS-232C) and TCP/IP control. Commands sent via hex-encoded protocol with control ID, model code, and checksum. No authentication required per source.

Transport

protocols:
  - serial
  - tcp
addressing:
  port: 7142  # TCP port for LAN commands
serial:
  baud_rate: 115200  # also supports: 38400, 19200, 9600, 4800 bps
  data_bits: 8
  parity: none
  stop_bits: 1
  flow_control: none
auth:
  type: none  # inferred: no auth procedure in source

Traits

- powerable       # POWER ON/OFF commands present
- routable        # INPUT SW CHANGE command present
- queryable       # multiple status/information request commands present
- levelable       # VOLUME ADJUST, PICTURE ADJUST, brightness, contrast, hue, etc.

Actions

- id: error_status_request
  label: Error Status Request
  kind: query
  params: []
  description: Gets error information bitfield (cover, fan, temperature, lamp, power errors)

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

- id: power_off
  label: Power Off
  kind: action
  params: []
  description: Turns off projector power including cooling time. No other commands accepted during shutdown.

- id: input_sw_change
  label: Input Switch Change
  kind: action
  params:
    - name: input_terminal
      type: integer
      description: Input terminal selector (hex values per appendix)

- id: picture_mute_on
  label: Picture Mute On
  kind: action
  params: []
  description: Disables video output. Cleared by input or video signal switch.

- id: picture_mute_off
  label: Picture Mute Off
  kind: action
  params: []

- id: sound_mute_on
  label: Sound Mute On
  kind: action
  params: []
  description: Disables audio output. Cleared by input switch, video signal switch, or volume adjustment.

- id: sound_mute_off
  label: Sound Mute Off
  kind: action
  params: []

- id: onscreen_mute_on
  label: Onscreen Mute On
  kind: action
  params: []
  description: Enables onscreen blackout. Cleared by input or video signal switch.

- id: onscreen_mute_off
  label: Onscreen Mute Off
  kind: action
  params: []

- id: picture_adjust
  label: Picture Adjust
  kind: action
  params:
    - name: target
      type: integer
      description: "0=Brightness, 1=Contrast, 2=Color, 3=Hue, 4=Sharpness"
    - name: mode
      type: integer
      description: "0=absolute value, 1=relative value"
    - name: value
      type: integer
      description: 16-bit signed adjustment value (low byte first)

- id: volume_adjust
  label: Volume Adjust
  kind: action
  params:
    - name: mode
      type: integer
      description: "0=absolute value, 1=relative value"
    - name: value
      type: integer
      description: 16-bit signed volume value (low byte first)

- id: aspect_adjust
  label: Aspect Adjust
  kind: action
  params:
    - name: value
      type: integer
      description: Aspect ratio selector (per appendix)

- id: other_adjust
  label: Other Adjust (Lamp/Light)
  kind: action
  params:
    - name: target
      type: integer
      description: "96h= Lamp/Light adjust"
    - name: mode
      type: integer
      description: "0=absolute value, 1=relative value"
    - name: value
      type: integer
      description: 16-bit signed adjustment value

- id: information_request
  label: Information Request
  kind: query
  params: []
  description: Gets projector name, lamp usage time (seconds), filter usage time (seconds)

- id: filter_usage_info_request
  label: Filter Usage Information Request
  kind: query
  params: []
  description: Gets filter usage time and alarm start time in seconds

- id: lamp_info_request_3
  label: Lamp Information Request 3
  kind: query
  params:
    - name: lamp
      type: integer
      description: "0=Lamp1, 1=Lamp2"
    - name: content
      type: integer
      description: "1=usage time (seconds), 4=remaining life (%)"

- id: carbon_savings_info_request
  label: Carbon Savings Information Request
  kind: query
  params:
    - name: type
      type: integer
      description: "0=Total Carbon Savings, 1=Carbon Savings during operation"

- id: remote_key_code
  label: Remote Key Code
  kind: action
  params:
    - name: key_code
      type: integer
      description: 16-bit key code (e.g., 0x0200=POWER ON, 0x0300=POWER OFF, 0x0500=AUTO, etc.)

- id: shutter_close
  label: Shutter Close
  kind: action
  params: []
  description: Closes lens shutter

- id: shutter_open
  label: Shutter Open
  kind: action
  params: []
  description: Opens lens shutter

- id: lens_control
  label: Lens Control
  kind: action
  params:
    - name: target
      type: integer
      description: "6h=Periphery Focus"
    - name: direction
      type: integer
      description: "0=Stop, 1=+1s, 2=+0.5s, 3=+0.25s, 7F=+continuous, 81=-continuous, FD=-0.25s, FE=-0.5s, FF=-1s"

- id: lens_control_request
  label: Lens Control Request
  kind: query
  params:
    - name: target
      type: integer
      description: "6h=Periphery Focus"
  response_fields:
    - name: upper_limit
      type: integer
    - name: lower_limit
      type: integer
    - name: current_value
      type: integer

- id: lens_control_2
  label: Lens Control 2
  kind: action
  params:
    - name: command
      type: integer
      description: "FFh=Stop"
    - name: mode
      type: integer
      description: "0=absolute, 2=relative"
    - name: value
      type: integer
      description: 16-bit position value

- id: lens_memory_control
  label: Lens Memory Control
  kind: action
  params:
    - name: operation
      type: integer
      description: "0=MOVE, 1=STORE, 2=RESET"

- id: reference_lens_memory_control
  label: Reference Lens Memory Control
  kind: action
  params:
    - name: operation
      type: integer
      description: "0=MOVE, 1=STORE, 2=RESET"

- id: lens_memory_option_request
  label: Lens Memory Option Request
  kind: query
  params:
    - name: target
      type: integer
      description: "0=LOAD BY SIGNAL, 1=FORCED MUTE"

- id: lens_memory_option_set
  label: Lens Memory Option Set
  kind: action
  params:
    - name: target
      type: integer
      description: "0=LOAD BY SIGNAL, 1=FORCED MUTE"
    - name: value
      type: integer
      description: "0=OFF, 1=ON"

- id: lens_info_request
  label: Lens Information Request
  kind: query
  params: []

- id: lens_profile_set
  label: Lens Profile Set
  kind: action
  params:
    - name: profile
      type: integer
      description: "0=Profile 1, 1=Profile 2"

- id: lens_profile_request
  label: Lens Profile Request
  kind: query
  params: []

- id: gain_parameter_request_3
  label: Gain Parameter Request 3
  kind: query
  params:
    - name: parameter
      type: integer
      description: "0=PICTURE/BRIGHTNESS, 1=CONTRAST, 2=COLOR, 3=HUE, 4=SHARPNESS, 5=VOLUME, 96h=LAMP/LIGHT"

- id: setting_request
  label: Settings Request
  kind: query
  params: []
  description: Gets base model type, sound function availability, profile number, clock/sleep timer availability

- id: running_status_request
  label: Running Status Request
  kind: query
  params: []
  description: Gets power status (Standby/Power on/Cooling), power on/off process status, operation status

- id: input_status_request
  label: Input Status Request
  kind: query
  params: []
  description: Gets signal switch status, signal list number, signal type (COMPUTER/VIDEO/S-VIDEO/COMPONENT/DVI-D/HDMI/DisplayPort/VIEWER)

- id: mute_status_request
  label: Mute Status Request
  kind: query
  params: []
  description: Gets picture mute, sound mute, onscreen mute, forced onscreen mute, onscreen display status

- id: model_name_request
  label: Model Name Request
  kind: query
  params: []
  description: Gets projector model name string

- id: cover_status_request
  label: Cover Status Request
  kind: query
  params: []
  description: Gets mirror/lens cover open/closed status

- id: freeze_control
  label: Freeze Control
  kind: action
  params:
    - name: state
      type: integer
      description: "1=Freeze on, 2=Freeze off"

- id: info_string_request
  label: Information String Request
  kind: query
  params:
    - name: type
      type: integer
      description: "3=Horizontal sync frequency, 4=Vertical sync frequency"

- id: eco_mode_request
  label: Eco Mode Request
  kind: query
  params: []
  description: Gets current eco/light/lamp mode setting

- id: lan_projector_name_request
  label: LAN Projector Name Request
  kind: query
  params: []
  description: Gets projector name via LAN

- id: lan_mac_address_request
  label: LAN MAC Address Request
  kind: query
  params: []
  description: Gets projector MAC address

- id: pip_pbp_request
  label: PIP/Picture-by-Picture Request
  kind: query
  params:
    - name: target
      type: integer
      description: "0=MODE, 1=START POSITION, 2=SUB INPUT, 9=SUB INPUT 2, A=SUB INPUT 3"

- id: edge_blending_mode_request
  label: Edge Blending Mode Request
  kind: query
  params: []

- id: eco_mode_set
  label: Eco Mode Set
  kind: action
  params:
    - name: value
      type: integer
      description: Eco mode setting (per appendix)

- id: lan_projector_name_set
  label: LAN Projector Name Set
  kind: action
  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
  params:
    - name: target
      type: integer
      description: "0=MODE, 1=START POSITION, 2=SUB INPUT, 9=SUB INPUT 2, A=SUB INPUT 3"
    - name: value
      type: integer
      description: Setting value

- id: edge_blending_mode_set
  label: Edge Blending Mode Set
  kind: action
  params:
    - name: value
      type: integer
      description: "0=OFF, 1=ON"

- id: base_model_type_request
  label: Base Model Type Request
  kind: query
  params: []

- id: serial_number_request
  label: Serial Number Request
  kind: query
  params: []

- id: basic_info_request
  label: Basic Information Request
  kind: query
  params: []
  description: Gets operation status, content displayed, signal types, video/sound/freeze mute status

- id: audio_select_set
  label: Audio Select Set
  kind: action
  params:
    - name: terminal
      type: integer
      description: Input terminal for audio
    - name: source
      type: integer
      description: "0=terminal in DATA01, 2=COMPUTER"

Feedbacks

- id: error_status
  type: bitfield
  description: 12-byte error information (cover, temperature, fan, lamp, power errors)

- id: power_state
  type: enum
  values: [standby, power_on, cooling, network_standby, standby_error, standby_sleep, standby_powersaving]

- id: input_status
  type: object
  fields:
    - signal_switch_process: enum [not_executed, in_execution]
    - signal_list_number: integer
    - signal_type_1: enum [1-5, COMPUTER, VIDEO, S-VIDEO, COMPONENT, DVI-D, HDMI, DisplayPort, VIEWER]
    - signal_type_2: enum
    - content_displayed: enum [video_signal, no_signal, viewer, test_pattern, lan_displayed]

- id: mute_status
  type: object
  fields:
    - picture_mute: enum [off, on]
    - sound_mute: enum [off, on]
    - onscreen_mute: enum [off, on]
    - forced_onscreen_mute: enum [off, on]
    - onscreen_display: enum [not_displayed, displayed]

- id: model_name
  type: string
  description: NUL-terminated model name string

- id: serial_number
  type: string
  description: NUL-terminated serial number string

- id: lamp_usage_time
  type: integer
  description: Lamp usage time in seconds (updated at 1-minute intervals)

- id: lamp_remaining_life
  type: integer
  description: Lamp remaining life percentage (-1 if deadline exceeded)

- id: filter_usage_time
  type: integer
  description: Filter usage time in seconds (-1 if not defined)

- id: eco_mode
  type: integer
  description: Eco mode setting value

- id: projector_name
  type: string
  description: NUL-terminated projector name (up to 17 chars)

- id: mac_address
  type: string
  description: MAC address (6 bytes, e.g. "01-23-45-67-89-AB")

- id: pip_pbp_status
  type: object
  fields:
    - mode: enum [PIP, PICTURE_BY_PICTURE]
    - position: enum [TOP-LEFT, TOP-RIGHT, BOTTOM-LEFT, BOTTOM-RIGHT]
    - sub_input: integer

- id: edge_blending_mode
  type: enum
  values: [off, on]

- id: cover_status
  type: enum
  values: [normal, cover_closed]

- id: freeze_status
  type: enum
  values: [off, on]

- id: info_string
  type: string
  description: Horizontal or vertical sync frequency string

- id: basic_info
  type: object
  description: Operation status, content displayed, signal types, mute states

Variables

# All adjustable via corresponding SET actions; queryable via REQUEST actions:
# - eco_mode (097-8 / 098-8)
# - projector_name (097-45 / 098-45)
# - pip_pbp (097-198 / 098-198)
# - edge_blending (097-243-1 / 098-243-1)
# - audio_select (319-10)
# - lens_memory_option (053-5 / 053-6)
# - lens_profile (053-10 / 053-11)
# - picture_adjustments (brightness/contrast/color/hue/sharpness via 030-1 and 060-1)
# - volume (030-2 and 060-1)
# - aspect (030-12)
# - lamp/light adjust (030-15)

Events

# UNRESOLVED: source does not describe unsolicited event/notification messages

Macros

# UNRESOLVED: no explicit multi-step macro sequences defined in source

Safety

confirmation_required_for: []
interlocks:
  - description: "Power on sequence: While POWER ON command is executing, no other commands are accepted."
  - description: "Power off sequence: While POWER OFF command is executing (including cooling time), no other commands are accepted."
  - description: "Lens continuous drive: After sending 7Fh (drive plus) or 81h (drive minus), stop by sending 00h."
# UNRESOLVED: no voltage, current, power specifications in source

Notes

Command protocol: hex-encoded binary with structure [HEADER] [ID1] [ID2] [LEN] [DATA...] [CKS]
Control ID (ID1) and Model code (ID2) must match projector settings
Checksum (CKS): low-order byte of sum of all preceding bytes
Serial supports 5 baud rates: 115200/38400/19200/9600/4800 bps (auto-detected)
LAN uses TCP port 7142 exclusively
Response format differs by command class: 2xh for actions, 3xh for adjustments, 0xh for info queries
Error codes: ERR1/ERR2 combine for specific failure reasons (see error code table)
Input terminal and aspect values reference an appendix not included in this source
Wireless LAN requires separate wireless LAN unit (not specified in source)

Provenance

source_domains:
  - sharpdisplays.eu
source_urls:
  - https://www.sharpdisplays.eu/p/download/cp/Products/Projectors/Shared/CommandLists/NEC-ExternalControlManual-english.pdf
retrieved_at: 2026-05-13T07:34:00.101Z
last_checked_at: 2026-06-02T22:10:05.178Z

Verification Summary

verdict: verified
checked_at: 2026-06-02T22:10:05.178Z
matched_actions: 53
action_count: 53
confidence: medium
summary: "All 53 spec actions traced to source (dip-safe re-verify). (6 unresolved item(s) noted in Known Gaps.)"

Known Gaps

- "wireless LAN unit manual not included; external wireless LAN module required but specs not provided"
- "source does not describe unsolicited event/notification messages"
- "no explicit multi-step macro sequences defined in source"
- "no voltage, current, power specifications in source"
- "appendix \"Supplementary Information by Command\" values not provided"
- "key code list appendix values not fully enumerated beyond sample codes"

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

NEC C750Q C860Q Control Spec

Compatible models