ViewSonic VS11857 manual Introduction, Description, Set-Function Listing

1 Introduction

This document describes the hardware interface spec and software protocols of RS232 interface communication between Viewsonic Commercial Display and PC or other control unit with RS232 protocol. The protocol divide into three sections:

zSet-Function

zGet-Function

zRemote control pass-through mode

※In below document, “PC” will represents all the control units that can sent or receive the RS232 protocol command.

2 Description

2.1Hardware specification

Viewsonic LCD communication port in the rear side

(1)Connector type: DSUB 9 Pin Male

(2)Pin Assignment

Male DSUB 9Pin

(outside view)

Pin #	Signal	Remark
1	NC
2	RXD	Input to LCD Monitor
3	TXD	Output from LCD Monitor
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

2.2Communication Setting

- Baud Rate Select:	9600bps (fixed)
- Data bits:	8bits (fixed)
- Parity:	None (fixed)
- Stop Bits:	1(fixed)

2.3Command Message Reference

PC sends to Monitor command packet followed by “CR”. Every time PC sends control command to the Monitor, the Monitor shall response as follows:

1.If the message is receives correctly it will send “+” (02Bh) followed by “CR” (00Dh)

2.If the message is receives incorrectly it will send “-” (02Dh) followed by “CR” (00Dh)

3 Set-Function Listing

The PC can control the LCD Monitor for specific actions. The Set-Function command allows you to control the LCD monitor behavior in a remote sit through the RS232 port. The Set-Function packet format consists of 5 bytes. Note that the “Value” byte is always = 00.

ViewSonic CD3200 ii