ViewSonic CD4220 User Guide - Page 47

Introduction, Description - specs

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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: z Set-Function z Get-Function z Remote 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 4.1 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) Pin # 1 2 3 4 5 6 7 8 9 frame Signal NC RXD TXD NC GND NC NC NC NC GND Remark Input to LCD Monitor Output from LCD Monitor 4.2 Communication Setting - Baud Rate Select: - Data bits: - Parity: - Stop Bits: *Use of crossover (null modem) cable required for use with PC 9600bps (fixed) 8bits (fixed) None (fixed) 1(fixed) 4.3 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) ViewSonic CD4220 45

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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:
z
Set-Function
z
Get-Function
z
Remote 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
4.1
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)
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
4.2
Communication Setting
- Baud Rate Select:
9600bps (fixed)
- Data bits:
8bits (fixed)
- Parity:
None (fixed)
- Stop Bits:
1(fixed)
4.3
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)
ViewSonic
CD4220
45