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LDM RS-232 Protocol

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RS-232

This document describes the hardware interface and software protocols of RS-232 interface communication between the ViewSonic LED Display and computers or other control units with RS-232 protocol.

Hardware Specification

ViewSonic RS-232 serial port on the lower left side:

  1. Connector type: DB 9-Pin Female
  2. Use of straight-through parallel cable for connection
  3. Pin Assignment:
  Pin # Signal Remark
Female DB 9-Pin 1 NC  
2 TXD Output from Display
3 RXD Input to Display
4 NC  
5 GND GND
6 NC  
7 NC
8 NC
9 NC
frame GND

Communication Setting

Baud Rate Select: 115200bps (fixed)
Data Bits: 8 bits (fixed)
Parity: None (fixed)
Stop Bits: 1 (fixed)
Note: Make sure the Control Board Switch is switched to the left for RS-232 control.

Command Table

Function Command Code

(Hex)

HEX Data Range
Power on/off(standby):STBY 21 38 30 31 73 21 30 30 30 0D
Power on/off(standby):ON 21 38 30 31 73 21 30 30 31 0D
Input Select:USB auto play 22 38 30 31 73 22 30 30 33 0D
Input Select:HDMI1 22 38 30 31 73 22 30 30 34 0D
Input Select:HDMI2 22 38 30 31 73 22 30 31 34 0D
Input Select:HDMI3 22 38 30 31 73 22 30 32 34 0D
Input Select:HDMI4 22 38 30 31 73 22 30 33 34 0D
Brightness 24 38 30 31 73 24 3X 3X 3X 0D 000-100
Brightness:Bright down (-1) 24 38 30 31 73 24 39 30 30 0D
Brightness:Bright up (+1) 24 38 30 31 73 24 39 30 31 0D
Power lock:Unlock 34 38 30 31 73 34 30 30 30 0D
Power lock:Lock 34 38 30 31 73 34 30 30 31 0D
Volume 35 38 30 31 73 35 3X 3X 3X 0D 000-100
Volume:Volume down(-1) 35 38 30 31 73 35 39 30 30 0D
Volume:Volume up(+1) 35 38 30 31 73 35 39 30 31 0D
Mute:OFF 36 38 30 31 73 36 30 30 30 0D
Mute:ON 36 38 30 31 73 36 30 30 31 0D
Button lock:Unlock 38 38 30 31 73 38 30 30 30 0D
Button lock:Lock 38 38 30 31 73 38 30 30 31 0D
Menu lock:Unlock 3E 38 30 31 73 3E 30 30 30 0D
Menu lock:Lock 3E 38 30 31 73 3E 30 30 31 0D
Key Pad:UP 41 38 30 31 73 41 30 30 30 0D
Key Pad:DOWN 41 38 30 31 73 41 30 30 31 0D
Key Pad:LEFT 41 38 30 31 73 41 30 30 32 0D
Key Pad:RIGHT 41 38 30 31 73 41 30 30 33 0D
Key Pad:ENTER 41 38 30 31 73 41 30 30 34 0D
Key Pad:INPUT 41 38 30 31 73 41 30 30 35 0D
Key Pad:MENU/(EXIT) 41 38 30 31 73 41 30 30 36 0D
Key Pad:EXIT 41 38 30 31 73 41 30 30 37 0D
Key Pad:power on/off 41 38 30 31 73 41 30 30 38 0D
Key Pad:inputlist 41 38 30 31 73 41 30 30 39 0D
Key Pad:brightness 41 38 30 31 73 41 30 31 30 0D
Key Pad:blank 41 38 30 31 73 41 30 31 31 0D
Key Pad:home 41 38 30 31 73 41 30 31 32 0D
Key Pad:volume+ 41 38 30 31 73 41 30 31 33 0D
Key Pad:volume- 41 38 30 31 73 41 30 31 34 0D
Key Pad:next 41 38 30 31 73 41 30 31 35 0D
Key Pad:previous 41 38 30 31 73 41 30 31 36 0D
Key Pad:mute 41 38 30 31 73 41 30 31 37 0D
Key Pad:play 41 38 30 31 73 41 30 31 38 0D
Remote Control:Disable 42 38 30 31 73 42 30 30 30 0D
Remote Control:Enable 42 38 30 31 73 42 30 30 31 0D
Restore default 7E 38 30 31 73 7E 30 30 30 0D
Input Select: Cycle 22 38 30 31 73 22 30 30 5A 0D
Contrast 23 38 30 31 73 23 3X 3X 3X 0D 000-100
Sharpness 25 38 30 31 73 25 3X 3X 3X 0D 000-100
Color 26 38 30 31 73 26 3X 3X 3X 0D 000-100
Tint 27 38 30 31 73 27 3X 3X 3X 0D 000-100
Color mode:Normal 29 38 30 31 73 29 30 30 30 0D
Color mode:Warm 29 38 30 31 73 29 30 30 31 0D
Color mode:Cold 29 38 30 31 73 29 30 30 32 0D
Color mode:Personal 29 38 30 31 73 29 30 30 33 0D
Freeze:Off 2A 38 30 31 73 2A 30 30 30 0D
Freeze:On 2A 38 30 31 73 2A 30 30 31 0D
Bass 2E 38 30 31 73 2E 3X 3X 3X 0D 000-024
Treble 2F 38 30 31 73 2F 3X 3X 3X 0D 000-024
zoom mode:FULL(16:9) 31 38 30 31 73 31 30 30 30 0D
zoom mode:NORMAL (4:3) 31 38 30 31 73 31 30 30 31 0D
zoom mode:REAL (1:1) 31 38 30 31 73 31 30 30 32 0D
zoom mode:21:9 31 38 30 31 73 31 30 30 33 0D
OSD language:English 32 38 30 31 73 32 30 30 30 0D
OSD language:French 32 38 30 31 73 32 30 30 31 0D
OSD language:Spanish 32 38 30 31 73 32 30 30 32 0D
OSD language:German 32 38 30 31 73 32 30 30 33 0D
OSD language:Russian 32 38 30 31 73 32 30 30 34 0D
OSD language:Dutch 32 38 30 31 73 32 30 30 35 0D
OSD language:T-Chinese 32 38 30 31 73 32 30 30 36 0D
OSD language:S-Chinese 32 38 30 31 73 32 30 30 37 0D
OSD language:Turkish 32 38 30 31 73 32 30 30 38 0D
OSD language:Arabic 32 38 30 31 73 32 30 30 39 0D
PBP-Mode:Full Screen 39 38 30 31 73 39 30 30 30 0D
PBP-Mode:Dual Screen 39 38 30 31 73 39 30 30 31 0D
PBP-Mode:Three-part Screen 39 38 30 31 73 39 30 30 32 0D
PBP-Mode:Quad Screen 39 38 30 31 73 39 30 30 33 0D
PBP-Sound select:Main 3A 38 30 31 73 3A 30 30 30 0D
PBP-Sound select:Sub 3A 38 30 31 73 3A 30 30 31 0D
Date: Year 56 38 30 31 73 56 59 3X 3X 0D 17-99
Date: Month 56 38 30 31 73 56 4D 3X 3X 0D 01-12
Date: Day 56 38 30 31 73 56 44 3X 3X 0D 01-31
Time: Hour 57 38 30 31 73 57 48 3X 3X 0D 00-23
Time: Min 57 38 30 31 73 57 4D 3X 3X 0D 00-59
Time: Sec 57 38 30 31 73 57 53 3X 3X 0D 00-59
Get-Brightness 62 38 30 31 67 62 30 30 30 0D
Get-Volume 66 38 30 31 67 66 30 30 30 0D
Get-Mute 67 38 30 31 67 67 30 30 30 0D
Get-Input select 6A 38 30 31 67 6A 30 30 30 0D
Get-Power status 6C 38 30 31 67 6C 30 30 30 0D
Get-Remote control 6E 38 30 31 67 6E 30 30 30 0D
Get-Power lock 6F 38 30 31 67 6F 30 30 30 0D
Get-Button lock 70 38 30 31 67 70 30 30 30 0D
Get-Menu lock 71 38 30 31 67 71 30 30 30 0D
Get-ACK 7A 38 30 31 67 7A 30 30 30 0D
Get-Thermal 30 38 30 31 67 30 30 30 30 0D
Get-Operation hour 31 38 30 31 67 31 30 30 30 0D
Get-Device name 34 38 30 31 67 34 30 30 30 0D
Get-MAC address 35 38 30 31 67 35 30 30 30 0D
Get-IP address 36 38 30 31 67 36 30 30 30 0D
Get-Serial number 37 38 30 31 67 37 30 30 30 0D
Get-FW version 38 38 30 31 67 38 30 30 30 0D
Get-Contrast 61 38 30 31 67 61 30 30 30 0D
Get-Sharpness 63 38 30 31 67 63 30 30 30 0D
Get-Color 64 38 30 31 67 64 30 30 30 0D
Get-Tint 65 38 30 31 67 65 30 30 30 0D
Get Freeze 69 38 30 31 67 69 30 30 30 0D
Get-PBP mode 74 38 30 31 67 74 30 30 30 0D
Get-Date: Year 32 38 30 31 67 32 59 30 30 0D
Get-Date: Month 32 38 30 31 67 32 4D 30 30 0D
Get-Date: Day 32 38 30 31 67 32 44 30 30 0D
Get-Time: Hour 33 38 30 31 67 33 48 30 30 0D
Get-Time: Min 33 38 30 31 67 33 4D 30 30 0D
Get-Time: Sec 33 38 30 31 67 33 53 30 30 0D

Get Operation Time Example

Assumed the accumulated operation time is 00,123,456 hrs.

  • Send: 38 30 31 67 31 30 30 30 0D (Get Operation time)
  • Reply: 32 30 31 72 31 31 32 33 34 35 36 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0D
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