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10. RS-232 Protocol
10.1 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.
10.2 Description
10.2.1 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