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12. RS232 Protocol
12.1. 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.
12.2. Description
12.2.1. 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)
[Special case]3.5mm barrel
connector
12.2.2. Communication Setting
- Baud Rate Select:
9600bps (fixed)
- Data bits:
8 bits (fixed)
- Parity:
None (fixed)
- Stop Bits:
1 (fixed)
12.2.3. 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
Pin #
Signal
Tip
TXD
Ring
RXD
Sleeve
GND
19
Remark
Input to Commercial TV or DS
Output from Commercial TV or DS
Remark
Output from Commercial TV or DS
Input to Commercial TV or DS
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