Viewsonic CDE3203 Manual De Usuario

28

This document describes the hardware interface spec and software protocols 

of RS232 interface communication between ViewSonic Commercial TV / Digital 

Signage and PC or other control unit with RS232 protocol.

The protocol contains three sections command:

• Set-Function

• Get-Function

• Remote control pass-through mode

※ 

In the document below, “PC” represents all the control units that can sent or 

receive the RS232 protocol command.

2.1 Hardware specification
Viewsonic TV communication port on the rear side

(1) Connector type: DSUB 9-Pin Male

(2) Pin Assignment

Male DSUB 9-Pin

(outside view)

1 

NC

 

2 

RXD

Input to Commercial TV or DS

3 

TXD

Output from Commercial TV or DS

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 respond as follows:

1.  If the message is received correctly it will send “+” (02Bh) followed by “CR” (00Dh)

2.  If the message is received incorrectly it will send “-” (02Dh) followed by “CR” 

(00Dh)