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RS232 Protocol
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 sent or
receive the RS232 protocol command.
2. Description
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)
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)
Pin #
Signal
1
NC
2
RXD
3
TXD
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.
26
Remark
Input to Commercial TV or DS
Output from Commercial TV or DS
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