ViewSonic CDE3205-EP - Инструкция по эксплуатации - Страница 32

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10.  RS232 Protocol

10.1.  Introduction

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 send or receive the RS232 protocol 

command.

10.2.  Description

10.2.1. 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)

Pin # 

Signal

Remark

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

[Special case]3.5mm barrel 

connector 

Pin # 

Signal

Remark

Tip

TXD

Output from Commercial TV or DS

Ring

RXD

Input to Commercial TV or DS

Sleeve

GND

10.2.2. Communication Setting

- Baud Rate Select:   9600bps (fixed)
- Data bits:  

8 bits (fixed)

- Parity:  

None (fixed) 

- Stop Bits:  

1 (fixed)

10.2.3. 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)