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ViewSonic CD3200 ii
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:
z Set-Function
z Get-Function
z 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)
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 (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)
3 Set-Function Listing
The PC can control the LCD Monitor for specific actions. The Set-Function command allows you to control the
LCD monitor behavior in a remote sit through the RS232 port. The Set-Function packet format consists of 5
bytes. Note that the “Value” byte is always = 00.
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