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 .......................................................................... ii 
2.3  Command Message Reference .............................................................. ii 
3 Set-Function Listing ....................................................................................... ii 
4 Get-Function Listing...................................................................................... vi 
5  Remote Control Pass-through mode ............................................................ ix 
 
 
Table 2-1: PC Set-function command to LCD Monitor (ID=C0h) .................................................... iv 
Table 2-2: PC Get-function command to LCD Monitor................................................................... vii 
Table 2-3: Baseline RCU Pass-through codes .................................................................................x 
 
						

							 
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 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 
2.2  Communication Setting  
 - Baud Rate Select:  9600bps (fixed)  
 - Data bits:   8bits (fixed)  
 - Parity:   None (fixed)  
 - Stop Bits:   1(fixed)  
 
 
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 Set-Function Listing 
The PC can control the LCD Monitor for specific actions. The Set-Function command allows you to control the 
LCD monitor behavior in a remote sit through the RS232 port. The Set-Function packet format consists of 5 
bytes. Note that the “Value” byte is always = 00. 
 
 
 
						

							 
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 Byte   1 Byte  1 Byte  1 Byte 00D
Bytes order  1  2  3  4  5  6 
 
Example: Set Mute-ON command (ASCII) 
Name  Length Command Value1 Value2 Value3 CR 
Byte Count  5   6   0   0  0 00D
Bytes order  1  2  3  4  5  6 
 
Example: Set Mute-OFF command (ASCII) 
Name  Length Command Value1 Value2 Value3 CR 
Byte Count  5   6   0  0  1 00D
Bytes order  1  2  3  4  5  6 
 
Example: Set Tint to -50 command (ASCII) 
Name  Length Command Value1 Value2 Value3 CR 
Byte Count  5   ‘   -  5  0 00D
Bytes order  1  2  3  4  5  6 
 
						

							 
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 the HDTV power status: ON or 
Standby 
Input Select   “  22  000: VGA 
001: DVI 
002: COMPOSITE1 
003: COMPOSITE2 
004: COMPONENT1 
005: COMPONENT2 
006: S-Video1  
007: S-Video2 
008: HDMI1 
009: HDMI2 
010: HDMI3 
011: HDMI4 
012: HDMI5 
~  
Contrast   #   23  000 ~ 100    Brightness   $  24  000 ~ 100    Sharpness   %   25  000 ~ 100    Color   &  26  000 ~ 100    Tint   ‘  27  -50 ~ +50    Flesh tone  (  28  000: OFF 
001: ON Set and reset Flesh tone 
White Balance  )  29  000: STD 
001: WARM 
002: COLD Sets White balance 
Reserved  *  2A    For future use Reserved  +  2B    For future use Reserved  ,   2C    For future use Sound Effect  -  2D  000: SRS OFF 
001: SRS ON Set and reset SRS 
Bass  .  2E  000 ~ 100  Sets Bass value Treble  /  2F  000 ~ 100  Sets Treble value Balance  0  30  000 ~ 100  Sets Balance position Picture Size   1  31  000: SMART  
001: 4 x 3  
002: 16 x 9  
003: ZOOM  
OSD Language   2  32  000: English  
001: Deutsch  
002: Francias  
003: Italiano  
004: Espanol  
005: Dutch  
006: Dansk 
007:Traditional Chinese  
008: Japanese 
009: Brazilian 
010: Reserved 
011: Reserved 
012: Reserved 
: 
: 
999: Reserved  
OSD timeout  3  33  000: 10sec 
001: 20sec 
002: 30sec Set OSD timeout 
Reserved  4   34    For future use Volume   5   35  000 ~ 100    Mute   6  36  000: OFF 
001: ON (mute)   
 
						

							 
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 
009: HDMI2 
010: HDMI3 
011: HDMI4 
012: HDMI5 
~  
TV Channel   =  3D  000 ~ 999    Reserved  >  3E    For future use Reserved  ?  3F    For future use Number   @  40  000 ~ 009    Key Pad  A   41  000: UP  
001: DOWN  
002: LEFT  
003: RIGHT  
004: ENTER  
005: INPUT  
006: MENU/EXIT 
~  
Remote Control   B   42  000: DISABLE 
001: ENABLE  
002: PASS THROUGH Disable: RCU has no effect on HDTV. 
Enabled: RCU controls the HDTV. This is 
the power up default on the HDTV. 
Pass through: 
RCU has no effect on 
HDTV and all RCU command codes are 
transmitted to FC via the RS232 port. See 
page ix for more details 
Key Pad  C  43  000: DISABLE 
001: ENABLE Disable: Key Pad have no effect on HDTV.
Enabled: Key Pad control the HDTV. This 
is the power up default on the HDTV. 
Factory reset  ~  7E  000  Rests HDTV to factory setting 
 
						

							 
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 Command Value1 Value2 Value3 CR 
Byte Count  5   1 Byte  0   0  0 00D
Bytes order  1  2  3  4  5  6 
 
Monitor shall response to Get-Function with the following packet format: 
 
LCD Monitor response packet format: 
Name  Length Value1 Value2 Value3 Value4 CR 
Byte Count  5   1 Byte  1 Byte 1 Byte 1 Byte 00D
Bytes order 1  2 3 4 5 6 
 
Response packet (to Get-Function):  
Length:  
Total bytes of packet = 5 ASCII excluding “CR” 
Exception: Total bytes for On-Hours = 6 
Value[1-4]:  
Four ASCII codes: Value range is from 0000 ~ 9999 
Exception: Value[1-5] for On-Hours 
 
 
LCD Monitor will send “+” (02Bh), “CR” bytes to PC after receiving a valid command 
LCD Monitor will send “-” (02Dh), “CR” bytes to PC if the command is not valid 
 
						

							 
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  -50 ~ +50  Gets Tint value Get-Volume   f  66  000 ~ 100   Gets Volume value Get-Mute   g  67  000: OFF (unmuted) 
001: ON (muted) Gets Mute ON/OFF status 
Get-RCU h 68 000: DISABLE 
001: ENABLE  
002: PASS THROUGH Gets RCU mode status 
Get-Key Pad  i  69 
 000: DISABLE 
001: ENABLE Gets Buttons ON/OFF status 
Get-Input select  j  6A   000: VGA 
001: DVI 
002: COMPOSITE1 
003: COMPOSITE2 
004: COMPONENT1 
005: COMPONENT2 
006: S-Video1  
007: S-Video2 
008: HDMI1 
009: HDMI2 
010: HDMI3 
011: HDMI4 
012: HDMI5 
 Gets Input select status 
Reserved  k  6B    Reserved for future expansion Get-Power status  l  6C  000: STBY 
001: ON Gets the status of the HDTV power.  
HDTV response: 
000 = HDTV is in standby 
001 = HDTV is ON 
Get-On hours  m  6D  00000 ~ 99999  Get the ON hours of the HDTV. HDTV 
shall accumulate the ON hours in 
Flash memory. When it receives this 
command it will response with the ON 
hour value of 5 bytes.  
Get-ACK  z  7A  000  This command is used to test the 
communication link. 
 
 
						

							 
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 the volume value is 50):  
Name  Length Value1 Value2 Value3 Value4 CR 
Byte Count  5   0   0   5   0 00D
Bytes order 1  2 3 4 5 6 
 
 
ƒ The following is an example of PC requesting the On-hours value from the LCD Monitor 
  
PC send “Get-On hours” command to Monitor (In ASCII) 
Name  Length Command Value1 Value2 Value3 CR 
Byte Count  5   m   0   0  0 00D
Bytes order  1  2  3  4  5  6 
 
LCD Monitor will send “-” (02Dh), “CR” bytes to PC if the command is not valid 
Otherwise the LCD Monitor will respond with the On-Hours value as outlined below: 
 
LCD-Monitor response packet to Get-On-hours value is 12,500 hours):  
Name  Length Value1 Value2 Value3 Value4 Value5 CR  
Byte Count  6  1 2 5  0 0 00D 
Bytes order 1  2 3 4 5 6 7 
Note that this response contain 6-bytes 
 
A special command “Get-ACK” is used to test the communication link between PC and the LCD Monitor. The 
LCD Monitor shall response to “Get-ACK” command with a “+” or “-“. 
 
Get-ACK from PC to LCD (ASCII) 
Name  Length Command Value1 Value2 Value3 CR 
Byte Count  5   z   0   0  0 00D
Bytes order  1  2  3  4  5  6 
 
 
LCD Monitor will send “+” (02Bh); “CR” bytes to NMP-530 after receiving the command indicating that the 
communication link is OK  
 
 
						

							 
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  Length   RCU-Code1  RCU-Code2  CR  
Byte Count  3 MSB  LSB 00D 
Bytes order  1  2  3  4 
  
 
Example: Remote Control pass-through when “Menu” key is pressed (1A) 
Name  Length   RCU-Code1  RCU-Code2  CR  
Byte Count  3 1  A 00D 
Bytes order  1  2  3  4 
 
Example: Remote Control pass-through when key “1” is pressed (01) 
Name  Length   RCU-Code1  RCU-Code2  CR  
Byte Count  3 0  1 00D 
Bytes order  1  2  3  4 
 
Example: Remote Control pass-through when “OK” key is pressed (1F) 
Name  Length   RCU-Code1  RCU-Code2  CR  
Byte Count  3 1  F 00D 
Bytes order  1  2  3  4 
 
 
						

							 
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 (INPUTS) 16   46 
PIP/POP 17   47 
WIDE 18   48 
SLEEP 19   49 
MENU 1A   4A 
UP    1B    4B 
DOWN    1C    4C 
LEFT   1D    4D 
RIGHT 1E   4E 
OK (ENTER)  1F    4F 
PLAY    20    50 
PAUSE 21   51 
FAST FORWARD  22    52 
FAST BACKWARD  23    53 
SKIP 24   54 
REPLAY 25   55 
STOP 26   56 
RECORD 27   57 
 28  58 
 29  59 
 2A  5A 
 2B  5B 
  2C  5C 
  2D  5D 
  2E  5E 
  2F  5F