NEC NEC UNKNOWN Series RS-232 / IP control commands

Summary

NEC UNKNOWN Series projector supporting both RS-232C serial and wired LAN (TCP/IP) control. Document BDT140013 Rev 7.1. Commands are hex-encoded with checksum validation. Power on/off, input routing, picture/sound mute, lens control, and extensive query commands are documented.

Transport

protocols:
  - tcp
  - serial
addressing:
  port: 7142  # stated: "Use TCP port number 7142"
serial:
  baud_rate: [115200, 38400, 19200, 9600, 4800]  # stated: "115200/38400/19200/9600/4800 bps"
  data_bits: 8  # stated: "8 bits"
  parity: none  # stated: "None"
  stop_bits: 1  # stated: "1 bit"
  flow_control: none  # UNRESOLVED: flow control not stated in source
auth:
  type: none  # inferred: no auth procedure in source

Traits

# Source documents power, routing, and query commands:
- powerable
- routable
- queryable
- levelable

Actions

# Actions use hex-encoded commands with format:
# [Header] [Model] [ID1] [ID2] [LEN] [DATA...] [CKS]
# Responses follow similar encoding with ERR1/ERR2 codes

- id: power_on
  label: Power On
  kind: action
  params: []
  hex_example: "02h 00h 00h 00h 00h 02h"

- id: power_off
  label: Power Off
  kind: action
  params: []
  hex_example: "02h 01h 00h 00h 00h 03h"

- id: input_sw_change
  label: Input Switch
  kind: action
  params:
    - name: input_terminal
      type: hex
      description: Hex code for input terminal (see Appendix for codes)
  hex_example: "02h 03h 00h 00h 02h 01h 06h 0Eh"

- id: picture_mute_on
  label: Picture Mute On
  kind: action
  params: []
  hex_example: "02h 10h 00h 00h 00h 12h"

- id: picture_mute_off
  label: Picture Mute Off
  kind: action
  params: []
  hex_example: "02h 11h 00h 00h 00h 13h"

- id: sound_mute_on
  label: Sound Mute On
  kind: action
  params: []
  hex_example: "02h 12h 00h 00h 00h 14h"

- id: sound_mute_off
  label: Sound Mute Off
  kind: action
  params: []
  hex_example: "02h 13h 00h 00h 00h 15h"

- id: onscreen_mute_on
  label: Onscreen Mute On
  kind: action
  params: []
  hex_example: "02h 14h 00h 00h 00h 16h"

- id: onscreen_mute_off
  label: Onscreen Mute Off
  kind: action
  params: []
  hex_example: "02h 15h 00h 00h 00h 17h"

- id: picture_adjust
  label: Picture Adjust
  kind: action
  params:
    - name: adjustment_target
      type: hex
      description: "00h=Brightness, 01h=Contrast, 02h=Color, 03h=Hue, 04h=Sharpness"
    - name: adjustment_mode
      type: hex
      description: "00h=absolute, 01h=relative"
    - name: adjustment_value
      type: integer
      description: 16-bit signed value (low-order 8 bits then high-order 8 bits)
  hex_example: "03h 10h 00h 00h 05h 00h FFh 00h 0Ah 00h 21h"

- id: volume_adjust
  label: Volume Adjust
  kind: action
  params:
    - name: adjustment_mode
      type: hex
      description: "00h=absolute, 01h=relative"
    - name: adjustment_value
      type: integer
      description: 16-bit value
  hex_example: "03h 10h 00h 00h 05h 05h 00h 00h 0Ah 00h 27h"

- id: aspect_adjust
  label: Aspect Adjust
  kind: action
  params:
    - name: aspect_value
      type: hex
      description: Hex code for aspect mode (see Appendix)
  hex_example: "03h 10h 00h 00h 05h 18h 00h 00h [DATA01] 00h [CKS]"

- id: lamp_adjust
  label: Lamp/Light Adjust
  kind: action
  params:
    - name: adjustment_mode
      type: hex
      description: "00h=absolute, 01h=relative"
    - name: adjustment_value
      type: integer
      description: 16-bit value
  hex_example: "03h 10h 00h 00h 05h 96h FFh [DATA03] [DATA04] [DATA05] [CKS]"

- id: remote_key_code
  label: Remote Key Code
  kind: action
  params:
    - name: key_code
      type: hex
      description: Key code from documented key code list
  hex_example: "02h 0Fh 00h 00h 02h [DATA01] 00h [CKS]"

- id: shutter_close
  label: Shutter Close
  kind: action
  params: []
  hex_example: "02h 16h 00h 00h 00h 18h"

- id: shutter_open
  label: Shutter Open
  kind: action
  params: []
  hex_example: "02h 17h 00h 00h 00h 19h"

- id: lens_control
  label: Lens Control
  kind: action
  params:
    - name: target
      type: hex
      description: "06h=Periphery Focus"
    - name: direction
      type: hex
      description: "00h=Stop, 01h/02h/03h=plus, 7Fh=cont_plus, 81h=minus, FDh/FEh/FFh=minus_timed"
  hex_example: "02h 18h 00h 00h 02h [DATA01] [DATA02] [CKS]"

- id: lens_control_2
  label: Lens Control 2
  kind: action
  params:
    - name: control
      type: hex
      description: "FFh=Stop, else adjustment mode"
    - name: adjustment_mode
      type: hex
      description: "00h=absolute, 02h=relative"
    - name: adjustment_value
      type: integer
      description: 16-bit value
  hex_example: "02h 1Dh 00h 00h 04h [DATA01]-[DATA04] [CKS]"

- id: lens_memory_control
  label: Lens Memory Control
  kind: action
  params:
    - name: operation
      type: hex
      description: "00h=MOVE, 01h=STORE, 02h=RESET"
  hex_example: "02h 1Eh 00h 00h 01h [DATA01] [CKS]"

- id: reference_lens_memory_control
  label: Reference Lens Memory Control
  kind: action
  params:
    - name: operation
      type: hex
      description: "00h=MOVE, 01h=STORE, 02h=RESET"
  hex_example: "02h 1Fh 00h 00h 01h [DATA01] [CKS]"

- id: lens_memory_option_set
  label: Lens Memory Option Set
  kind: action
  params:
    - name: target
      type: hex
      description: "00h=LOAD BY SIGNAL, 01h=FORCED MUTE"
    - name: value
      type: hex
      description: "00h=OFF, 01h=ON"
  hex_example: "02h 21h 00h 00h 02h [DATA01] [DATA02] [CKS]"

- id: lens_profile_set
  label: Lens Profile Set
  kind: action
  params:
    - name: profile_number
      type: hex
      description: "00h=Profile 1, 01h=Profile 2"
  hex_example: "02h 27h 00h 00h 01h [DATA01] [CKS]"

- id: eco_mode_set
  label: Eco Mode Set
  kind: action
  params:
    - name: eco_mode
      type: hex
      description: Hex code for eco mode (see Appendix)
  hex_example: "03h B1h 00h 00h 02h 07h [DATA01] [CKS]"

- id: lan_projector_name_set
  label: LAN Projector Name Set
  kind: action
  params:
    - name: projector_name
      type: string
      description: Up to 16 bytes, NUL-terminated
  hex_example: "03h B1h 00h 00h 12h 2Ch [DATA01-16] 00h [CKS]"

- id: pip_picture_by_picture_set
  label: PIP/Picture by Picture Set
  kind: action
  params:
    - name: setting_type
      type: hex
      description: "00h=MODE, 01h=START POSITION, 02h=SUB INPUT, 09h=SUB INPUT 2, 0Ah=SUB INPUT 3"
    - name: value
      type: hex
      description: Setting value (varies by setting_type)
  hex_example: "03h B1h 00h 00h 03h C5h [DATA01] [DATA02] [CKS]"

- id: edge_blending_mode_set
  label: Edge Blending Mode Set
  kind: action
  params:
    - name: mode
      type: hex
      description: "00h=OFF, 01h=ON"
  hex_example: "03h B1h 00h 00h 03h DFh 00h [DATA01] [CKS]"

- id: freeze_control
  label: Freeze Control
  kind: action
  params:
    - name: freeze
      type: hex
      description: "01h=ON, 02h=OFF"
  hex_example: "01h 98h 00h 00h 01h [DATA01] [CKS]"

- id: audio_select_set
  label: Audio Select Set
  kind: action
  params:
    - name: input_terminal
      type: hex
      description: Hex code for input terminal
    - name: setting_value
      type: hex
      description: "00h=terminal_specified, 01h=BNC, 02h=COMPUTER"
  hex_example: "03h C9h 00h 00h 03h 09h [DATA01] [DATA02] [CKS]"

- id: error_status_request
  label: Error Status Request
  kind: query
  params: []
  hex_example: "00h 88h 00h 00h 00h 88h"

- id: information_request
  label: Information Request
  kind: query
  params: []
  hex_example: "03h 8Ah 00h 00h 00h 8Dh"

- id: filter_usage_info_request
  label: Filter Usage Information Request
  kind: query
  params: []
  hex_example: "03h 95h 00h 00h 00h 98h"

- id: lamp_info_request_3
  label: Lamp Information Request 3
  kind: query
  params:
    - name: lamp_number
      type: hex
      description: "00h=Lamp 1, 01h=Lamp 2"
    - name: content
      type: hex
      description: "01h=usage_time, 04h=remaining_life"
  hex_example: "03h 96h 00h 00h 02h [DATA01] [DATA02] [CKS]"

- id: carbon_savings_request
  label: Carbon Savings Information Request
  kind: query
  params:
    - name: type
      type: hex
      description: "00h=Total, 01h=During operation"
  hex_example: "03h 9Ah 00h 00h 01h [DATA01] [CKS]"

- id: lens_control_request
  label: Lens Control Request
  kind: query
  params:
    - name: target
      type: hex
      description: "06h=Periphery Focus"
  hex_example: "02h 1Ch 00h 00h 02h [DATA01] 00h [CKS]"

- id: lens_memory_option_request
  label: Lens Memory Option Request
  kind: query
  params:
    - name: target
      type: hex
      description: "00h=LOAD BY SIGNAL, 01h=FORCED MUTE"
  hex_example: "02h 20h 00h 00h 01h [DATA01] [CKS]"

- id: lens_info_request
  label: Lens Information Request
  kind: query
  params: []
  hex_example: "02h 22h 00h 00h 01h 00h 25h"

- id: lens_profile_request
  label: Lens Profile Request
  kind: query
  params: []
  hex_example: "02h 28h 00h 00h 00h 2Ah"

- id: gain_parameter_request_3
  label: Gain Parameter Request 3
  kind: query
  params:
    - name: adjusted_value_name
      type: hex
      description: "00h=PICTURE/BRIGHTNESS, 01h=CONTRAST, 02h=COLOR, 03h=HUE, 04h=SHARPNESS, 05h=VOLUME, 96h=LAMP"
  hex_example: "03h 05h 00h 00h 03h [DATA01] 00h 00h [CKS]"

- id: setting_request
  label: Setting Request
  kind: query
  params: []
  hex_example: "00h 85h 00h 00h 01h 00h 86h"

- id: running_status_request
  label: Running Status Request
  kind: query
  params: []
  hex_example: "00h 85h 00h 00h 01h 01h 87h"

- id: input_status_request
  label: Input Status Request
  kind: query
  params: []
  hex_example: "00h 85h 00h 00h 01h 02h 88h"

- id: mute_status_request
  label: Mute Status Request
  kind: query
  params: []
  hex_example: "00h 85h 00h 00h 01h 03h 89h"

- id: model_name_request
  label: Model Name Request
  kind: query
  params: []
  hex_example: "00h 85h 00h 00h 01h 04h 8Ah"

- id: cover_status_request
  label: Cover Status Request
  kind: query
  params: []
  hex_example: "00h 85h 00h 00h 01h 05h 8Bh"

- id: info_string_request
  label: Information String Request
  kind: query
  params:
    - name: info_type
      type: hex
      description: "03h=Horizontal sync freq, 04h=Vertical sync freq"
  hex_example: "00h D0h 00h 00h 03h 00h [DATA01] 01h [CKS]"

- id: eco_mode_request
  label: Eco Mode Request
  kind: query
  params: []
  hex_example: "03h B0h 00h 00h 01h 07h BBh"

- id: lan_projector_name_request
  label: LAN Projector Name Request
  kind: query
  params: []
  hex_example: "03h B0h 00h 00h 01h 2Ch E0h"

- id: lan_mac_address_request2
  label: LAN MAC Address Status Request 2
  kind: query
  params: []
  hex_example: "03h B0h 00h 00h 02h 9Ah 00h 4Fh"

- id: pip_picture_by_picture_request
  label: PIP/Picture by Picture Request
  kind: query
  params:
    - name: setting_type
      type: hex
      description: "00h=MODE, 01h=START POSITION, 02h=SUB INPUT, 09h=SUB INPUT 2, 0Ah=SUB INPUT 3"
  hex_example: "03h B0h 00h 00h 02h C5h [DATA01] [CKS]"

- id: edge_blending_mode_request
  label: Edge Blending Mode Request
  kind: query
  params: []
  hex_example: "03h B0h 00h 00h 02h DFh 00h 94h"

- id: base_model_type_request
  label: Base Model Type Request
  kind: query
  params: []
  hex_example: "00h BFh 00h 00h 01h 00h C0h"

- id: serial_number_request
  label: Serial Number Request
  kind: query
  params: []
  hex_example: "00h BFh 00h 00h 02h 01h 06h C8h"

- id: basic_info_request
  label: Basic Information Request
  kind: query
  params: []
  hex_example: "00h BFh 00h 00h 01h 02h C2h"

Feedbacks

# Response format: [Response Header] [Model] [ID1] [ID2] [LEN] [ERR1] [ERR2] [CKS]
# Or with data: [Response Header] [Model] [ID1] [ID2] [LEN] [DATA...] [CKS]
# ERR1=00h/ERR2=00h = success; non-zero indicates error

- id: error_status_response
  label: Error Status Response
  type: object
  properties:
    - name: error_info
      type: bitfield
      description: 12 bytes of error information (see bit tables in section 3.1)

- id: general_response
  label: General Response
  type: object
  properties:
    - name: err1
      type: hex
      description: Error high byte
    - name: err2
      type: hex
      description: Error low byte
    - name: cks
      type: hex
      description: Checksum

- id: data_response
  label: Data Response
  type: object
  properties:
    - name: data
      type: bytes
      description: Variable length data (varies by command)

# Error codes (ERR1/ERR2):
# 00h/00h: Command not recognized
# 00h/01h: Command not supported by model
# 01h/00h: Invalid value
# 01h/01h: Invalid input terminal
# 01h/02h: Invalid language
# 02h/00h: Memory allocation error
# 02h/02h: Memory in use
# 02h/03h: Value cannot be set
# 02h/04h: Forced onscreen mute on
# 02h/06h: Viewer error
# 02h/07h: No signal
# 02h/08h: Test pattern or filter displayed
# 02h/09h: No PC card inserted
# 02h/0Ah: Memory operation error
# 02h/0Ch: Entry list displayed
# 02h/0Dh: Power is off
# 02h/0Eh: Command execution failed
# 02h/0Fh: No authority
# 03h/00h: Incorrect gain number
# 03h/01h: Invalid gain
# 03h/02h: Adjustment failed

Variables

# Source documents adjustable parameters via GAIN PARAMETER REQUEST 3:
- id: brightness
  label: Brightness
  type: integer
  range: [0, 255]  # UNRESOLVED: actual range not stated, inferred from 8-bit values

- id: contrast
  label: Contrast
  type: integer
  range: [0, 255]

- id: color
  label: Color
  type: integer
  range: [0, 255]

- id: hue
  label: Hue
  type: integer
  range: [0, 255]

- id: sharpness
  label: Sharpness
  type: integer
  range: [0, 255]

- id: volume
  label: Volume
  type: integer
  range: [0, 255]

- id: lamp_light_adjust
  label: Lamp/Light Adjust
  type: integer
  range: [0, 255]

- id: eco_mode
  label: Eco Mode
  type: enum
  values: [off, normal, eco, auto_eco, long_life, silent, boost]

- id: projector_name
  label: Projector Name
  type: string
  max_length: 16

- id: pip_mode
  label: PIP Mode
  type: enum
  values: [off, pip, picture_by_picture]

- id: edge_blending
  label: Edge Blending
  type: boolean

- id: lens_profile
  label: Lens Profile
  type: enum
  values: [profile_1, profile_2]

Events

# UNRESOLVED: source does not document unsolicited event notifications from the device

Macros

# Source documents standby mode requirements for receiving commands:
# Serial standby modes: Normal, Active, Eco, NORMAL, NETWORK STANDBY, SLEEP, OFF, ON, STANDBY POWER ON
# LAN standby modes: Normal, NORMAL, NETWORK STANDBY, SLEEP, HTBaseT STANDBY, OFF, ON, STANDBY POWER ON
# Some models only support certain standby modes for LAN vs serial control

Safety

confirmation_required_for: []
interlocks:
  - name: power_on_block
    description: "While POWER ON command is executing, no other command can be accepted"
  - name: power_off_block
    description: "While POWER OFF command is executing (including cooling time), no other command can be accepted"
  - name: lens_stop
    description: "After sending 7Fh or 81h in lens control, stop driving by sending 00h"
# UNRESOLVED: safety warnings related to lamp replacement, dust exposure, or portrait cover orientation not explicitly documented

Notes

Command checksum (CKS) calculated as low-order one byte of sum of all preceding bytes
Data length (LEN) indicates byte count of data portion following LEN
Control ID (ID1) and Model Code (ID2) must match projector settings
Standby mode must be properly set for device to accept commands via serial or LAN
Lamp usage time updated at 1-minute intervals despite 1-second resolution
Some commands return FFh for error conditions

Provenance

source_domains:
  - sharpdisplays.eu
source_urls:
  - https://www.sharpdisplays.eu/p/download/cp/Products/Projectors/Shared/CommandLists/NEC-ExternalControlManual-english.pdf
retrieved_at: 2026-04-29T13:53:11.848Z
last_checked_at: 2026-06-02T22:11:52.668Z

Verification Summary

verdict: verified
checked_at: 2026-06-02T22:11:52.668Z
matched_actions: 53
action_count: 53
confidence: medium
summary: "All 53 spec actions traced to source (dip-safe re-verify). (9 unresolved item(s) noted in Known Gaps.)"

Known Gaps

- "specific model names within the UNKNOWN Series are not enumerated in the source"
- "flow control not stated in source"
- "actual range not stated, inferred from 8-bit values"
- "source does not document unsolicited event notifications from the device"
- "safety warnings related to lamp replacement, dust exposure, or portrait cover orientation not explicitly documented"
- "specific input terminal hex codes vary by model - source references appendix for full list"
- "base model type values not enumerated in source"
- "protocol version not stated in source"
- "HDBaseT standby mode availability not fully clarified"

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

NEC UNKNOWN Series Control Spec