Rs232 Protocol - ViewSonic VTMS2431 User Manual

Other Information

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
2.1 Hardware specification
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
2.2 Communication Setting
• Baud Rate Select: 9600bps (fixed)
• Data bits: 8bits (fixed)
• Parity: None (fixed)
• Stop Bits: 1 (fixed)
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)
Contact ViewSonic service team at: http://www.ViewSonic.com or call our service team: United States 1-800-688-6688, Canada 1-866-463-4775
ViewSonic
Pin # Signal
1 NC
2 RXD
3 TXD
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.
45
Remark
Input to LCD Monitor
Output from LCD Monitor
VTMS2431