Rs-232 Protocol; Introduction; Description; Rs232 Hardware Specification - ViewSonic IFP9850-3 Guia Del Usuario

10. RS-232 Protocol

10.1 Introduction

This document describes the hardware interface spec and software protocols of
RS232 interface communication between ViewSonic LFD 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.

10.2 Description

10.2.1 RS232 Hardware Specification

ViewSonic LFD communication port on the rear side
(1) Connector type: DSUB 9-Pin Male (or 3.5mm barrel connector)
(2) Pin Assignment
(3) Use of crossover (null modem) cable for connection
Male DSUB 9-Pin
Male DSUB 9-Pin
Pin # Signal Remark
1 NC
2 RXD Input to Display
3 TXD Output from Display
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC Proporciona alimentación de
+5V/2A para una llave externa
específica *3.0
frame GND
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