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26
11. RS232 Protocol
11.1. 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.
11.2. Description
11.2.1. 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
11.2.2. Communication Setting
- Baud Rate Select: 9600bps (xed)
- Data bits: 8 bits (xed)
- Parity: None (xed)
- Stop Bits: 1 (xed)
11.2.3. 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)
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