User Manual

Table Of Contents

RS-232 Protocol

This document describes the hardware interface spec and soware protocols of the

RS-232 interface communicaon between ViewSonic LFD and a PC or other control

units with RS-232 protocol.

The protocol contains three command secons:

• Set-Funcon

• Get-Funcon

• Remote control pass-through mode

NOTE: Below, “PC” represents all the control units that can send or receive the

RS-232 protocol command.

Descripon

RS-232 Hardware Specicaon

ViewSonic LFD communicaon port on the rear side:

1. Connector type: DSUB 9-Pin Male (female or 3.5 mm barrel connector)

2. Use of crossover (null modem) cable for connecon

3. Pin Assignment:

Male DSUB 9-Pin

(preferred)

Female 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

frame GND

3.5 mm barrel

connector (alternative

for limited space)

Item Signal Remark

Tip TXD Output from Display

Ring RXD Input to Display

Sleeve GND