Description; Hardware Specification; Communication Setting; Command Message Reference - ViewSonic CD4233 Hardware Interface Spec And Software Protocols

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:
 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 specification

Viewsonic LCD communication port in the rear side
(1) Connector type: DSUB 9 Pin Male
(2) Pin Assignment
Male DSUB 9Pin
(outside view)
2.2

Communication Setting

- Baud Rate Select:
- Data bits:
- Parity:
- Stop Bits:
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)
3

Protocol 1 : with ID

3.1

Command Description

Length: Total Byte of Message excluding "CR"
________________________________________________________________
May 28, 2007
Commercial Display RS-232 Protocol
Pin #
1
2
3
4
5
6
7
8
9
frame
*Use of crossover (null modem) cable
required for use with PC
9600bps (fixed)
8bits (fixed)
None (fixed)
1(fixed)
2 / 16
Revision 1.x
Signal Remark
NC
RXD Input to LCD Monitor
TXD Output from LCD Monitor
NC
GND
NC
NC
NC
NC
GND
Commercial Display RS-232 Protocol