1
PL4901/PL5501/PL5502
RS232 & LAN Protocol Installation Guide
2
Table of Contents
Introduction ........................................................................................................................... 3
Wire arrangement ......................................................................................................................................................... 3
RS232 pin assignment ................................................................................................................................................... 3
Communication setting ...................................................................................................................................... 4
Command message reference ............................................................................................................................ 4
Connections and communication settings .............................................................................. 4
RS232 serial port connection ..................................................................................................................................... 4
RS232 via LAN ............................................................................................................................................................... 5
Protocol Command Description ............................................................................................. 6
Set-function listing ......................................................................................................................................................... 6
Set-function description ............................................................................................................................................... 6
Set-function format ........................................................................................................................................... 6
Set-function table .............................................................................................................................................. 8
Get-function listing ...................................................................................................................................................... 11
Get-function description ............................................................................................................................................ 11
Get-function format ........................................................................................................................................ 11
PC Get-function command .............................................................................................................................. 13
Date: 2020/03/31
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Introduction
This document describes the hardware interface spec and software protocols of RS232 interface
communication between Commercial Display and PC or other control unit with RS232 protocol.
This set protocol allow users to assign the ID in the command to control the specify ID monitor.
The set protocol contains two sections command: Set-Function and Get-Function
In this document, "PC" represents all the control units that can send or receive the RS232 protocol command.
Wire arrangement
Wire Arrangement
P1
Color
P2 1 Black
1 2 Brown
3
3
Red
2 4 Orange
4 5 Yellow
5 6 Green
6
7
Blue
7 8 Purple
8
9
Gray
9
Case
Drain wire
Case
RS232 pin assignment
Pin
Description
Pin
Description
1
NC 2 RXD
3
TXD 4 NC
5
GND
6
NC
7
RTS
8
CTS 9 NC
Use of crossover (null modem) cable requires use with PC.
4
Communication setting
Baud rate select: 9600bps (fixed)/ Data bits: 8 bits (fixed)
Parity: None (fixed)/ Stop Bits: 1(fixed)
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 received correctly, it will send "+" (02Bh) followed by "CR" (00Dh).
2. If the message is received incorrectly, it will send "-" (02Dh) followed by "CR" (00Dh).
Connections and communication settings
Choose one of the connections and set up properly before RS232 control.
RS232 serial port connection
The image below is just for illustration purpose, PL4901/PL5501/PL5502 use RJ45 connector in display side for RS232
connection.
5
RS232 via LAN
Make sure the display and the computer are within the same network.
IP Protocol Port: 4660
PC or laptop
LAN cable
RJ45 port on a display
6
Protocol Command Description
Item
Description
Length
Total Bytes of Message excluding "CR"
Display ID
Identification for each display
Display ID is “01” for LAN control & RS232 control
Command Type
Identify command type,
"s" (0x73h): Set Command
"g" (0x67h): Get Command "r"
(0x72h): Reply Command
"+" (0x2Bh): Valid command Reply
"-" (0x2Dh): Invalid command Reply
Command
Function command code: One byte ASCII code
Value [1~3]
Three bytes ASCII that defines the value
CR
0x0D
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 11 bytes.
Set-function description
Item
Description
Length
Total Bytes of Message excluding "CR"
Display ID
Identification for each display
Display ID is “01” for LAN control & RS232 control
Command Type
Identify command type, "s"
(0x73h): Set Command
Command
Function command code: One byte ASCII code
Value [1~3]
Three bytes ASCII that defines the value
CR
0x0D
Set-function format
Send: (Command Type="s")
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Byte count
1 Byte
2 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
Bytes order
1
2~3 4 5 6 7 8 9
7
Reply: (Command Type="+" or "-")
Name
Length
ID
Command type
CR
Byte count
1 Byte
2 Byte
1 Byte
1 Byte
Bytes order
1
2~3 4 5
Example 1: Set Brightness as 76 and this command is valid.
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x73
0x24
0x30
0x37
0x36
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
CR
Hex
0x34
0x30 0x31
0x2B
0x0D
Example 2: Set Brightness as 176 and this command is NOT valid.
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x73
0x24
0x31
0x37
0x36
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
CR
Hex
0x34
0x30 0x31
0x2D
0x0D
Example 3: Set Balance as 50 this command is valid.
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x73
0x39
0x30
0x35
0x30
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
CR
Hex
0x34
0x30 0x31
0x2D
0x0D
Example 4: Set Balance as 115 this command is Not valid.
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x73
0x39
0x31
0x31
0x35
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
CR
Hex
0x34
0x30 0x31
0x2D
0x0D
8
Set-function table
Set Function
Len
ID
Cmd
Type
Cmd
Code
(Hex)
RS232/LAN
Remark
Power
8
s 21
000: Standby
001: On
Video Source
8
s 22
000 : VGA
001 : HDMI1
002: HDMI2
006 : DVI
007 : DisplayPort
Contrast
8
s 23
000 ~ 100
Brightness
8
s 24
000 ~ 100
Sharpness
8
s 25
000 ~ 020
Aspect Ratio
8
s 31
001 : Movie expand 16:9
004 : 4:3
Language
8
s 32
000: English
001: Français
002: Español
004:简中
005: Português
006: German
009: Russia
013: Italian
Sound Mode
8
s 33
001:Standard
002:Music
003:Movie
004:Sports
005:Custom
Volume
8
s 35
000 ~ 060
Mute
8
s 36
000: Off
001: On
Treble
8
s 37
000 ~ 100
Bass
8
s 38
000 ~ 100
Balance
8
s 39
000 ~ 100
Remote control
8
s 40
000 : Vol+
001 : Vol-
010 : Remote up
9 011 : Remote down
012 : Remote left
013 : Remote right
014 : Remote OK
020 : Remote Menu
021 : Remote Source
022 : Remote Exit
Picture Mode
8
s 81
000 : Standard
001 : Bright
002 : Soft
003 : Custom
Chroma/Saturation
8
s 82
000 ~ 100
Hue 8 s 83
000 ~ 100
Backlight
8
s 84
000 ~ 100
Tint 8 s 86
000: Cool
001: Standard
002: Warm
Auto Adjustment
Execute
8
s 8F
000
For VGA only, execute auto
adjustment.
RTC Year
8
s 98
000 ~ 099
Ex: value=012 means Year 2012
If the setting is illegal (Ex: Year
2013 doesn't have the date
Feb/29), return "Invalid Command
Reply".
RTC Month
8
s 99
001 ~ 012
Ex: value=001 means January
If the setting is illegal (Ex: February
doesn't have the date Feb/31),
return "Invalid Command Reply".
RTC Day
8
s 9A
001 ~ 031
If the setting is illegal (Ex: Day31
doesn't exist in April), return
"Invalid Command Reply".
RTC Hour
8
s 9B
000 ~ 023
RTC Minute
8
s 9C
000 ~ 059
H Monitor
8
s A4
001 ~ 009
V Monitor
8
s A5
001 ~ 009
Tiling Position
8
s A6
001 ~ 081
Frame Comp.
8
s A8
000: Off
001: On
Power Save
8
s A9
000: Off
001: Low
10
002: High
Switch on status
8 s
AB
000: Power off
001:Force On
002: Last Status
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Get-function listing
The PC can interrogate the LCD Monitor for specific information. The Get-Function packet format
consists of 5 bytes which are similar to the Set-Function packet structure. Note that the "Value" byte is
always = 00.
Get-function description
Item
Description
Length
Total Bytes of messages excluding "CR"
Display ID
Identification for each of display
Display ID is “01” for LAN control & RS232 control
Command Type
Identify command type,
"g" (0x67h): Get Command
Command
Function command code: One byte ASCII code
Value [1~3]
Three bytes ASCII that defines the value
NOTE: To get backlight senor, thermal sensor, and ambient sensor, you
need four bytes ASCII that defines the value and the length is 9.
CR
0x0D
Get-function format
Send: (Command Type="g")
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Byte count
1 Byte
2 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
Bytes order
1
2~3 4 5 6 7 8 9
Reply: (Command Type="r" or "-")
If the Command is valid, Command Type ="r"
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Byte count
1 Byte
2 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
Bytes order
1
2~3 4 5 6 7 8 9
If the Command is Not valid, Command Type="-"
Name
Length
ID
Command type
CR
Byte count
1 Byte
2 Byte
1 Byte
1 Byte
Bytes order
1
2~3 4 5
Example 1: Get Brightness and this command is valid.
12
The Brightness value is 67.
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x67
0x62
0x30
0x30
0x30
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x72
0x62
0x30
0x36
0x37
0x0D
Example 3: Get Balance from and this command is valid.
The Balance value is 32.
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x67
0X39
0x30
0x30
0x30
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x72
0x39
0x30
0x33
0x32
0x0D
Example 4: Get Balance, but the Balance command ID is error and it is NOT in the command table.
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
CR
Hex
0x38
0x30 0x31
0x67
0XD7
0x30
0x30
0x30
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
CR
Hex
0x34
0x30 0x31
0x2D
0x0D
Example 5: Get Operation time from system and this command is valid.
The System Operation time value is 1786 (ASCII code).
Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
Value4
Value5
CR
Hex
0x38
0x30 0x31
0x67
0X76
0x30
0x30
0x30
0x30
0x30
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
Value4
Value5
CR
Hex
0x38
0x30 0x31
0x72
0x76
0x30
0x31
0x37
0x38
0x36
0x0D
Example 6: Get CO2 Value from System and this command is valid.
The lux value is 786 (ASCII code).
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Send (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
Value4
Value5
CR
Hex
0x38
0x30 0x31
0x67
0XAB
0x30
0x30
0x30
0x30
0x30
0x0D
Reply (Hex Format)
Name
Length
ID
Command type
Command
Value1
Value2
Value3
Value4
Value5
CR
Hex
0x38
0x30 0x31
0x72
0xAB
0x30
0x30
0x37
0x38
0x36
0x0D
PC Get-function command
Get Function
Len
ID
Cmd
Type
Cmd
Code
(Hex)
RS232/LAN
Remark
Model Info
20
g 20
(1) Input value: Byte1 - Byte2 Byte3…Byte15
Byte2~Byte11=0x00
Byte1=0x01: Get Customer Name
Byte1=0x02: Get Customer Model
Name
Byte1=0x04: Get Scaler Firmware
Version
Byte1=0x06: Get Serial Number
(2) Return value: Byte1 - Byte2 Byte3…Byte15
The Byte1 value at the return
value should be the same as the
value of Byte1 at input value.
Byte2~Byte15 should be ASCII
format.
Ex: If Customer=Generic,
Byte1=0x01, Byte2='G',
Byte3='e',...Byte8='c',
Byte9~Byte11=0x00.
Ex: If the Scaler Firmware
Version=1.02, Byte1=0x03,
Byte2='1', Byte3='.', Byte4='0',
Byte5='2', Byte6~Byte11=0x00.
MDA :
Byte1=0x01: Get Customer
Name -> BENQ
Byte1=0x02: Get Customer
Model Name -> by project
Byte1=0x04: Get Scaler
Firmware Version
Byte1=0x05: Get LAN Firmware
Version
Byte1=0x06: Get Serial Number
Signal Status
8
g 22
000: Signal unstable
14
001: Signal stable (Active Sync
exists)
Treble
8
g 37
000~100 Bass
8
g 38
000~100
Balance
8
g 39
000~100
Contrast
8
g 61
000 ~ 100
Brightness
8
g 62
000 ~ 100
Sharpness
8
g 63
000 ~ 020
Sound Mode
8
g 65
001: Standard
002: Music
003: Movie
004: Sports
005: Custom
Volume
8
g 66
000 ~ 100
Mute
8
g 67
000: Off
001: On
Video Source
8
g 6A
000 : VGA
001 : HDMI1
002: HDMI2
006 : DVI
007 : DisplayPort
Power
8
g 6C
000: Standby
001: On
Thermal
Sensor Value
10
g 71
(1) Input value:
Byte1-Byte2-...Byte5
(a) Byte1=0x01: Get the thermal
sensor value from main board
0x02: Get
the thermal sensor value from
keypad board
(b) Byte2~Byte5 are reserved,
should b 0x00
(2) Return value:
Byte1-Byte2-...Byte5
(a) Byte1=0x01: The thermal
sensor value is from main board
0x02: The thermal
sensor value is rom keypad board
(b) Byte2: If the thermal value is
Ex: If the temperature 5℃is
from main board, the return
value should be: Byte1=0x01,
Byte2=0x2B, Byte3=0x30,
Byte4=0x30, Byte5=0x35.
Ex: If the temperature -15℃is
from keypad board, the return
value should be: Byte1=0x02,
Byte2=0x2D, Byte3=0x30,
Byte4=0x31, Byte5=0x35.
15
>=0, Byte2='+' (0x2B)
If the thermal value is <0,
Byte2='-' (0x2D)
(c) Byte3~Byte5: The absolute
value of the temperature, in ASCII
format.
Monitor ID
8
g 75
001 ~ 098
Operation
Time
10
g 76
00000 ~ 99999
unit is in hour
Aspect Ratio
8
g 77
001 : 4:3
003 : 16:9
Language
8
g 78
000: English
001: Français
002: Español
004: 简中
005: Português
006: German
009: Russia
013: Italian
Picture Mode
8
g B1
000: Standard
001:Bright
002:Soft
004:Custom
Chroma/
Saturation
8
g B2
000 ~ 100
Hue
8
g B3
000 ~ 100
Backlight
8
g B4
000 ~ 100
Tint
8
g B6
000: Cool
001: Standard
002: Warm
RTC Year
8
g C8
000 ~ 099
Ex: value=012 means Year 2012
If the RTC is not enable, return
"Invalid Command Reply"
RTC Month
8
g C9
001 ~ 012
Ex: value=001 means January
If the RTC is not enable, return
"Invalid Command Reply"
RTC Day
8
g CA
001 ~ 031
If the RTC is not enable, return
16
"Invalid Command Reply"
RTC Hour
8
g CB
000 ~ 023
If the RTC is not enable, return
"Invalid Command Reply"
RTC Minute
8
g CC
000 ~ 059
If the RTC is not enable, return
"Invalid Command Reply"
H Monitor
8
g D4
001 ~ 009
V Monitor
8
g D5
001 ~ 009
Tiling Position
8
g D6
000 ~ 081
Frame Comp.
8
g D8
000: Off
001: On
Power Save
8
g D9
000: Off
001: Low
002: High
Switch on
Status
8 g
DA
000:Power off
001:Force On
002:Last Status
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