ViewSonic VT4200-L VT3200-L, VT4200-L User Guide (English), M Region - Page 43

RS232 Protocol

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Other Information RS232 Protocol 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: • Set-Function • Get-Function • Remote control pass-through mode h 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) 12345 6789 Pin # 1 2 3 4 5 6 7 8 9 frame Signal NC RXD TXD NC GND NC NC NC NC GND Remark Input to LCD Monitor Output from LCD Monitor * 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) 34

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Other Information
34
RS232 Protocol
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:
• Set-Function
• Get-Function
• Remote control pass-through mode
h
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
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.
1
2
3
4
5
6
7
8
9
Male DSUB 9Pin
(outside view)
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)