From ViewSonic User Guide Database
LD216-251 RS-232 Protocol
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:
- Connector type: DB 9-Pin Female
- Use of straight-through parallel cable for connection
- 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
|
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
|
|