ViewSonic CD4620, VS11915 Protocol 1, with ID, Protocol 2, without ID, Hardware specification

3.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.

Viewsonic CD4620 and CD4220 contain with 2 set of protocol command

1.Protocol 1, with ID

This set protocol allow user to assign the ID in the command to control the specify ID monitor

2.Protocol 2, without ID

The set protocol is best for single display control and for Viewsonic NMP-530.

Both sets protocol contain three sections command:

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.

4.Description

4.1Hardware 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
4.2 Communication Setting	required for use with PC
- Baud Rate Select:	9600bps (fixed)
- Data bits:	8bits (fixed)
- Parity:	None (fixed)
- Stop Bits:	1(fixed)

4.3Command 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)

ViewSonic CD4620 45

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