Viewsonic CDE4200-L 사용자 설명서

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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.

2.1 Hardware specification
Viewsonic communication port in the rear side

(1) Connector type: DSUB 9 Pin Male

(2) Pin Assignment

Male DSUB 9Pin

(outside view)

1 

NC

 

2 

RXD

Input to Monitor

3 

TXD

Output from 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)