ViewSonic Cd3200 Users Guide

 
ViewSonic CD3200 i 
CD3200 RS-232 Protocol 
 
  
Table of content
 
 
 
1 Introduction .................................................................................................... ii 
2 Description..................................................................................................... ii 
2.1 Hardware specification........................................................................... ii 
2.2 Communication Setting...

 
ViewSonic CD3200 ii 
 
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: 
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. 
2 Description 
2.1 Hardware specification...

 
ViewSonic CD3200 iii 
Set-Function description:  
Length:  
Total bytes of message = 5 ASCII (35H) excluding “CR” 
Command:  
Function command code: One byte ASCII code  
Value[1~3]:  
Three bytes ASCII that defines the value  
 
Set-Function format: 
Name  Length Command Value1 Value2 Value3  CR  
Byte Count   1 Byte   1 Byte   1 Byte  1 Byte  1 Byte  1 Byte 
Bytes order  1  2  3  4  5  6 
 
 
All Set-Function from PC to Monitor (ASCII) 
Name  Length Command Value1 Value2 Value3 CR 
Byte Count  5   1...

 
ViewSonic CD3200 iv 
LCD Monitor will send “+” (02Bh) and “CR” bytes to PC after receiving a valid command. 
LCD Monitor will send “-” (02Dh) and “CR” bytes to PC if the command is not valid. 
 
Value Range:   Three bytes ASCII value range  
Command Code:   Function command code in ASCII 
 
  
Table 3-1: PC Set-function command to LCD Monitor (ID=C0h)  Set Function   Command  
Code (ASCII)  Command 
Code (Hex) Value Range  
(Three ASCII bytes) Comments 
HDTV Power   !  21  000: STBY 
001: ON Controlled...

 
ViewSonic CD3200 v 
Sleep   7  37  000: OFF  
001: 10 Min  
002: 20 Min  
003: 30 Min  
004: 60 Min  
005: 90 Min  
006: 120 Min  
007: 150 Min  
~  
Reserved  8  38    For future use PIP Mode   9  39  000: OFF 
001: ON  
PIP Sound select   :  3A  000: MAIN 
001: PIP   
PIP position  ;  3B  000: UP_LEFT 
001: UP_RIGHT 
002: DOWN_LEFT 
003: DOWN_ RIGHT  
PIP Input   <  3C  000: None 
001: None 
002: COMPOSIT1 
003: COMPOSIT2 
004: COMPONENT1 
005: COMPONENT2 
006: S-Video1  
007: S-Video2 
008: HDMI1...

 
ViewSonic CD3200 vi  4  Get-Function Listing  
The PC can interrogate the LCD Monitor for specific information. The Get-Function packet format consists of 5 
bytes which is similar to the Set-Function packet structure. Note that the “Value” byte is always = 00. 
 
Get-Function description:  
Length:  
Total bytes of message = 5 ASCII (35H), excluding “CR” 
Command:  
Get-Function command code: One byte ASCII code  
Value[1~3]: 
Always = 000 
 
Get-Function format from PC to LCD (ASCII) 
Name  Length...

 
ViewSonic CD3200 vii 
 
Table 4-1 outlines the Get-function command list that must be supported by the LCD Monitor 
 
 Table 4-1: PC Get-function command to LCD Monitor  
Get Function   Command  
Code (ASCII) Command
Code (Hex)Response Range  
(Three ASCII bytes) Comments 
Get-Contrast   a  61  000 ~ 100   Gets Contrast value Get-Brightness   b  62  000 ~ 100   Gets Brightness value Get-Sharpness   c  63  000 ~ 100   Gets Sharpness value Get-Color   d  64  000 ~ 100   Gets Color value Get-Tint   e  65...

 
ViewSonic CD3200 viii 
ƒ The following is an example of PC requesting the volume value from the LCD Monitor: 
  
PC send Get-Volume-value packet to Monitor (In ASCII) 
Name  Length Command Value1 Value2 Value3 CR 
Byte Count  5   f   0   0   0  00D
Bytes order  1  2  3  4  5  6 
 
 
LCD Monitor will send “-” (02Dh), “CR” to PC if command is not recognized. 
Otherwise the LCD Monitor will respond with the volume value as outlined below: 
 
LCD-Monitor response packet to Get-volume-value (in this example...

 
ViewSonic CD3200 ix   
5  Remote Control Pass-through mode 
 
When PC sets the LCD monitor to Remote Control Pass through mode, the LCD shall send a three bytes 
packet (followed by “CR”) in response to RCU button activation. Note, that in this mode the RCU shall have no 
effect on the monitor function. For example: “+Volume” will not change the volume in the LCD but only sends 
“+Volume” code to PC over the RS232 port. 
 
Remote Control pass-through packet format from LCD monitor to PC(ASCII) 
Name...

 
ViewSonic CD3200 x 
 
Table 5-1: Baseline RCU Pass-through codes 
Key Code 
(HEX) 
Key Code 
(HEX) 
1 /SPACE  01    31 
2 /ABC  02    32 
3 /DEF  03    33 
4 /GHI  04    34 
5 /JKL  05    35 
6 /MNO  06    36 
7 /PQRS   07  37 
8 /TUV  08    38 
9 /WXYZ  09    39 
0 /@:/  0A  3A 
100 0B   3B 
RECALL 0C   3C 
SHIFT 0D  3D 
CLEAR   0E    3E 
ZOOM 0F   3F 
VOLUME UP (+) 10   40 
VOLUME DOWN (-) 11   41 
MUTE 12   42 
CHANNEL/PAGE UP (+) 13   43 
CHANNEL/PAGE DOWN (-) 14   44 
ON/STANDBY 15   45 
SOURCES...