ViewSonic VTMS2431 - RS232 Protocol and Command Reference; RS232 Hardware and Settings; RS232 Command Message Format

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ViewSonic VTMS2431
Other Information
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
2.1 Hardware specication
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 4 5
6 7 8 9
Pin # Signal Remark
1 NC
2 RXD Input to LCD Monitor
3 TXD Output from LCD Monitor
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
frame GND
* Use of crossover (null modem) cable required for use
with PC.
2.2 Communication Setting
• Baud Rate Select: 9600bps (xed)
• Data bits: 8bits (xed)
• Parity: None (xed)
• Stop Bits: 1 (xed)
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)
RS232 Protocol