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RS232 Protocol
1. Introduction
This document describes the hardware interface spec and software protocols of RS232 interface
communication between Viewsonic Commercial Display and PC or other control unit with RS232
protocol.
The protocol divide into three sections:
• Set-Function
• Get-Function
• Remote control pass-through mode
* In below document, "PC" will represents all the control units that can sent or receive the RS232
protocol command.
2. Description
Viewsonic LCD communication port in the rear side
(1) Connector type: DSUB 9 Pin Male
(2) Pin Assignment
Male DSUB 9Pin
(outside view)
1
2
3
6
7
2.2 Communication Setting
•
•
•
•
2.3 Command Message Reference
PC sends to Monitor command packet followed by "CR". Every time PC sends control command
to the Monitor, the Monitor shall response as follows:
1. If the message is receives correctly it will send "+" (02Bh) followed by "CR" (00Dh)
2. If the message is receives incorrectly it will send "-" (02Dh) followed by "CR" (00Dh)
Pin #
1
2
3
4
4
8
9
5
6
7
8
9
frame
* Use of crossover (null modem) cable required for use
with PC.
Signal
Remark
NC
RXD
Input to LCD Monitor
TXD
Output from LCD Monitor
NC
GND
NC
NC
NC
NC
GND
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