LD216-251 RS-232 Protocol

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RS-232

This document describes the hardware interface and software protocols of RS-232 serial communication between the ViewSonic LED Display and computers or control systems.

RS-232 Hardware Specification

ViewSonic RSD-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  
Female DSUB.png 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

RS-232 Communication Setting

Baud Rate Select: 115200bps (fixed)
Data Bits: 8 bits (fixed)
Parity: None (fixed)
Stop Bits: 1 (fixed)

Command Table

Function Command Code (Hex) HEX Data Range
Power On 21 38 30 31 73 21 30 30 31 0D  
Power Off (Standby) 21 38 30 31 73 21 30 30 30 0D  
Get-Power Status 6C 38 30 31 67 6C 30 30 30 0D  
Input Select: HDMI 1 22 38 30 31 73 22 30 30 34 0D  
Input Select: HDMI 2 22 38 30 31 73 22 30 31 34 0D  
Get-Input Select 6A 38 30 31 67 6A 30 30 30 0D  
Input Select: Home 22 38 30 31 73 22 30 30 41 0D  
Brightness: Down (-1) 24 38 30 31 73 24 39 30 30 0D  
Brightness: Up (+1) 24 38 30 31 73 24 39 30 31 0D  
Volume: Down (-1) 35 38 30 31 73 35 39 30 30 0D  
Volume: Up (+1) 35 38 30 31 73 35 39 30 31 0D  
Get-Volume 66 38 30 31 67 66 30 30 30 0D  
Mute: OFF 36 38 30 31 73 36 30 30 30 0D  
Mute: ON (mute) 36 38 30 31 73 36 30 30 31 0D  
Get-Mute 67 38 30 31 67 67 30 30 30 0D  
Number (0~9) 40 38 30 31 73 40 30 30 3x 0D x = 0~9
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 41 38 30 31 73 41 30 30 36 0D  
Key Pad: EXIT 41 38 30 31 73 41 30 30 37 0D  
Get-Operational Hours 31 38 30 31 67 31 30 30 30 0D