Viewsonic VT4236LED 사용자 가이드

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
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 In below document, “PC” will represents all the control units that can sent or receive the RS232 protocol 

command.

Viewsonic LCD communication port in the rear side

(1) Connector type: DSUB 9 Pin Male

(2) Pin Assignment

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)

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.

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2

3

4

5

6

7

8

9