User guide

Other Information
37
ViewSonic VT3205LED
ENGLISH
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:
•Set-Function
•Get-Function
•Remote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
2.1 Hardware specication
ViewsonicLCDcommunicationportintherearside
(1)Connectortype:DSUB9PinMale
(2)PinAssignment
Male DSUB 9Pin
(outside view)
1 2 3 4 5
6 7 8 9
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.
2.2 Communication Setting
•BaudRateSelect:9600bps(xed)
•Databits:8bits(xed)
•Parity:None(xed)
•StopBits:1(xed)
2.3 Command 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)
RS232 Protocol