IFP50-3 Protocolo RS-232

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Protocolo RS-232

This document describes the hardware interface spec and software protocols of RS-232 interface communication between ViewSonic LFD and PC or other control units with RS-232 protocol.

The protocol contains three command sections:

  • Set-Function
  • Get-Function
  • Remote control pass-through mode
NOTE: Below, “PC” represents all the control units that can send or receive the RS-232 protocol command.

Description

RS-232 Hardware Specification

ViewSonic LFD communication port on the rear side:

  1. Connector type: DSUB 9-Pin Male (or 3.5 mm barrel connector)
  2. Use of crossover (null modem) cable for connection
  3. Pin Assignment:
Pin # Signal Remark
Female DSUB 9-Pin 1 NC
Female DSUB.png
2 RXD Input to Display
3 TXD Output to Display
4 NC
5 GND
Male DSUB 9-Pin 6 NC
Male DSUB.png
7 NC
8 NC
9 NC Provide +5V/2A power for external specific dongle *3.0
frame GND
Item Signal Remark
3.5 mm barrel connector
(alternative for limited space)
Tip TXD Output to Display
3.5mm Barrel.png
Ring RXD Input to Display
Sleeve GND

LAN Hardware Specification

ViewSonic LFD communication port on the rear side:

  1. Connector type: 8P8C RJ45
  2. Pin assignment:
Pin # Signal Remark
LAN Spec.png
1 TX+ Output from Display
2 TX- Output from Display
3 RX+ Input to Display
4 BI_D3+ For 1G case
5 BI_D3- For 1G case
6 RX- Input to Display
7 BI_D4+ For 1G case
8 BI_D4- For 1G case
frame GND

RS-232 Communication Setting

  • Baud Rate Select: 9600bps (fixed)
  • Data bits: 8 bits (fixed)
  • Parity: None (fixed)
  • Stop Bits: 1(fixed)

LAN Communication Setting

  • Type: Ethernet
  • Protocol: TCP/IP
  • Port: 5000 (fixed)
  • Cross subnet: No
  • Logon Credentials: No

Command Message Reference
PC sends to LFD command packet followed by “CR”. Every time PC sends control command to Display, the Display shall respond 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)

Protocol

Set-Function Listing

The PC can control the Display for specific actions. The Set-Function command allows you to control the Display behavior at a remote site through the RS-232 port. The Set-Function packet format consists of 9 bytes.

Set-Function Description:

Length Total Byte of Message excluding “CR”
LFD ID Identification for each of Display (01~98; default is 01)
ID “99” means to apply the set command for all connected displays. Under such circumstances, only ID#1 display has to reply.
The LFD ID can be set via the OSD menu for each Display.
Command Type Identify command type,
"s" (0x73h): Set 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 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

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
NOTE: When PC applies command to all displays (ID=99), only the #1 set needs to reply by the name of ID=1.


Example 1: Set Brightness as 76 for Display (#02) and this; command is valid.

Send (Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR
Hex 0x38 0x30
0x32
0x73 0x24 0x30 0x37 0x36 0x0D

Reply (Hex Format)

Name Length ID Command Type CR
Hex 0x34 0x30
0x32
0x2B 0x0D

Example 2: Set Brightness as 75 for Display (#02) and this; command is NOT valid.

Send (Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR
Hex 0x38 0x30
0x32
0x73 0x24 0x30 0x37 0x35 0x0D

Reply (Hex Format)

Name Length ID Command Type CR
Hex 0x34 0x30
0x32
0x2D 0x0D

Set-Function Table

A. Basic Function

Set Function Length ID Command Command Value Range Comments
Type (ASCII) Code
(ASCII)
Code
(Hex)
(Three ASCII bytes)
Power On/Off
(Standby)
8 s ! 21 000: STBY
001: ON
1. The Power-on via LAN control may works only under specific mode. To see display UG for details. *3.1.1
2. “WOL by MAC address” may available as alternative.*3.2.1
Input Select 8 s " 22 000: TV
001: AV
002: S-Video
003: YPbPr
004: HDMI1
014: HDMI2
024: HDMI3
034: HDMI4
005: DVI
006: VGA1
016: VGA2
026: VGA3
007: Slot-in PC (OPS/SDM)/HDBT
008: Internal memory
009: DP
00A: Embedded/Main (Android)
1. No need for USB
2. For the case of two more same sources, the 2nd digital is used to indicate the extension.
3. The HEX of 00A is 30 30 41.
Brightness 8 s $ 24 000 ~ 100
900: Bright down (-1)
901: Bright up (+1)
*3.1.1
Backlight*3.2.0 8 A B 42 000~100 1. For Android platform whose main mode is controlled by backlight and the other sources are controlled by brightness.
2. Derived from Color calibration.
*3.2.0
Power Lock 8 s 4 34 000: Unlock
001: Lock
*See note in details
Volume 8 s 5 35 000 ~ 100
900: Volume down(-1)
901:Volume up(+1)
Mute 8 s 6 36 000: OFF
001: ON (mute)
Button Lock 8; s 8 38 000: Unlock
0001: Lock
*See note in details
Menu Lock 8 s > 3E 000: Unlock
001: Lock
*See note in details
Number *3.1.1 8 s @ 40 000~009
Key Pad *3.1.1 8 s A 41 000: UP
001: DOWN
002: LEFT
003: RIGHT
004: ENTER
005: INPUT
006: MENU/(EXIT)
007: EXIT
Remote Control 8 s B 42 000: Disable
001: Enable
002: Pass through
Disable: RCU will be no function
Enabled: RCU controls normally
Pass through: Display will bypass the RC code to connected device via the RS-232 port, but not react itself.
Restore Default 8 s ~ 7E 000 Recover to factory setting
NOTE:
1. Behavior at Lock Modes
Lock Mode Behavior
Button Lock 1. Lock all buttons on the front panel and RCU, except for “Power”
2. All the SET functions should be workable via RS-232, even the ones with according hot key in RCU like Mute,…etc.
MENU Lock 1. Lock “MENU’ key of front panel and RCU
2. The Factory and Hospitality modes should not be blocked for the model using MENU-combined key to enter these two modes. Alternative approach will be indicated separately if any limitation by model.
POWER Lock 1. Lock “POWER” key on the front and RCU.
2. The SET_POWER on/off should be workable via RS-232, but does not mean the POWER lock will be released under this case.
3. Can not be unlocked by reset in OSD setting
4. Will auto AC power-on in power-lock
5. Under power-lock, the set will not enter power saving when no PC signal and neither not turn off when no other video signals after 15 minutes.
Remote control disable Lock the RCU keys, but keep the front panel buttons workable.
2. Wake-on-LAN by MAC address as alternative for SET Power on
(Length=126 bytes)
6 Bytes 6 Bytes (#1) 6 Bytes (#2) ... 6 Bytes (#16) 24 Bytes
0xFF FF ... FF MAC address MAC address ... MAC address 0x00 00 ... 00

B. Optional Function

Set Function Length ID Command Command Value Range Comments
Type (ASCII) Code
(ASCII)
Code
(Hex)
(Three ASCII bytes)
Contrast 8 s # 23 000~100
Sharpness 8 s % 25 000~100
Color 8 s & 26 000~100
Tint 8 s ' 27 000~100
Backlight On_Off 8 s ( 29 000: Off
001: On
Color Mode 8 s ) 29 000: Normal
001: Warm
002: Cold
003: Personal
Surround Sound 8 s - 2D 000~100
Bass 8 s . 2E 000~100
Treble 8 s / 2F 000~100
Balance 8 s 0 30 000~100 050 is central
Picture Size 8 s 1 31 000: FULL (16:9)
001: NORMAL (4:3)
002: REAL (1:1)
*3.1.0
OSD language 8 s 2 32 000: English
001: French
002: Spanish
Could be extended for more supported languages by model
PIP-Mode 8 s 9 39 000: OFF
001: PIP(POP)
002: PBP
PIP-Sound select 8 s : 3A 000: Main
001: Sub
PIP-Position 8 s ; 3B 000: Up
001: Down
002: Left
003: Right
PIP-Input 8 s 7 37 *2.9 000: TV
001: AV
002: S-Video
003: YPbPr
004: HDMI1
014: HDMI2
024: HDMI3
034: HDMI4
005: DVI
006: VGA1
016: VGA2
026: VGA3
007: Slot-in PC (OPS/SDM)/HDBT
008: Internal memory
009: DP
00A: Embedded/Main (Android)
Value range is same as SET-Input select
Tiling-Mode 8 s P 50 000: OFF
001: ON
(for video wall)
Tiling-Compensation 8 s Q 51 000: OFF
001: ON
(for video wall)
Bezel width compensation
Tiling-H by V Monitors 8 s R 52 01x~09x: H
0x1~0x9: V
(for video wall)
1. 2nd digital for H monitors
2. 3rd digital for V monitors
Tiling-Position 8 s S 53 001~025 (for Video wall)
Copy the screen of Position# to identified display
Date: Year 8 s V 56 Y17~Y99 Last 2 digits
(20)17~(20)99
Date: Month 8 s V 56 M01~M12 2 digits
Date: Day 8 s V 56 D01~D31 2 digits
Time: Hour 8 s W 57 H00~H23 24-hr format. 2 digits.
Time: Min 8 s W 57 M00~M59 2 digits
Time: Sec 8 s W 57 S00~S59 2 digits
NOTE:
1. Tiling definition of H Monitors, V Monitors, and Position
RS232 Tiling.png
2. Set Date example
Date: 2017-3/15
Send: 0x 38 30 31 73 56 59 31 37 0D (“Y17”)
Send: 0x 38 30 31 73 56 4D 30 33 0D (“M03”)
Send: 0x 38 30 31 73 56 44 31 35 0D (“D15”)
3. Set Time example
Time: 16:27:59
Send: 0x 38 30 31 73 57 48 31 36 0D (“H16”)
Send: 0x 38 30 31 73 57 4D 32 37 0D (“M27”)
Send: 0x 38 30 31 73 57 53 35 39 0D (“S59”)

Get-Function Listing

The PC can interrogate the LFD for specific information. The Get-Function packet format consists of 9 bytes which is similar to the Set-Function packet structure. Note that the “Value” byte is always = 000.

Get-Function Description:

Length Total Byte of Message excluding “CR”
TV/DS ID Identification for each of TV/DS (01~98; default is 01).
Command Type Identify command type,
"g" (0x67h): Get Command
"r" (0x72h): 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

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 from TV-05 and this command is valid. The Brightness value is 67.

Send (Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR
Hex 0x38 0x30
0x35
0x67 0x62 0x30 0x30 0x30 0x0D

Reply (Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR
Hex 0x38 0x30
0x35
0x72 0x62 0x30 0x36 0x37 0x0D

Example 2: Get Color from Display (#05), but the Color command is not supported by this model.

Send (Hex Format)

Name Length ID Command Type Command Value1 Value2 Value3 CR
Hex 0x38 0x30
0x35
0x67 0x26 0x30 0x30 0x30 0x0D

Reply (Hex Format)

Name Length ID Command Type CR
Hex 0x34 0x30
0x35
0x2D 0x0D

Get-Function Table

A. Basic Function

Get Function Length ID Command Command Value Range Comments
Type (ASCII) Code
(ASCII)
Code
(Hex)
(Three ASCII bytes)
Get-Brightness 8 g b 62 000~100
Get-Backlight*3.2.0 8 a B 42 000~100 1. For Android platform whose main mode is controlled by backlight and the other sources are controlled by brightness.
2. Derived from Color calibration. *3.2.0
Get-Volume 8 g f 66 000~100
Get-Mute 8 g g 67 000: Off
001: On (muted)
Get-Input Select 8 g j 6A 000~100 1. 1st digit for signal detection: 0 means “no signal”; 1 means “signal detected”
2. 2nd &3rd digit: See Set-function table
Get-Power Status: ON/STBY 8 g l 6C 001: ON
000: STBY
Get-Remote Control S g n 6E 000: Disable
001: Enable
002: Pass through
Get RCU mode status
Get-Power Lock 8 g o 6F 000: Unlock
001: Lock
Get-Button Lock 8 g p 70 000: Unlock
001: Lock
Get-Menu Lock 8 g l 6C 000: Unlock
001: Lock
Get-ACK 8 g z 7A 000 This command is used to test the communication link
Get-Thermal 8 g 0 30 000~100:
0~+100 deg C
-01~-99:
-1~-99 deg C
Get-Operation time*3.2.0 8 g 1 31 000 1. Accumulated hours in 6-digit integer (000,001~ 999,999)*3.2.0
2. Can not be reset when FW update and Factory initiation*3.2.2
3. Reply in new 32-byte format*3.2.0
Get-Device name 8 g 4 34 000 Reply in new 32-byte format *3.2.0
Get-MAC address 8 g 5 35 000 (for the model with LAN)
Reply in new 32-byte format*3.2.0
Get-IP address*3.2.0 8 g 6 36 000 (for the model with LAN)
Reply in new 32-byte format*3.2.0
Get-Serial number *3.2.0 8 g 7 37 000 Reply in new 32-byte format *3.2.0
Get-FW version *3.2.0 8 g 8 38 000 Reply in new 32-byte format *3.2.0
NOTE:
1. Get Operation Hour example
Assumed the accumulated operation hour is 123,456 hrs
Send: 0x 38 30 31 67 31 30 30 30 0D (Get Operation hour)
Reply: 0x 32 30 31 72 31 31 32 33 34 35 36 00 00 … 00 00 0D
2. Get Device Name example
Assumed the device name is CDE-5500
Send: 0x 38 30 31 67 34 30 30 30 0D (Get Device Name)
Reply: 0x 32 30 31 72 34 43 44 45 2D 35 35 30 30 00 00 … 00 00 0D
Assumed the device name is “NMP-302#1”
Send: 0x 38 30 31 67 34 30 30 30 0D (Get Device Name)
Reply: 0x 32 30 31 72 34 4E 4D 50 2D 33 30 32 23 31 00 00 …00 00 0D
3. Get MAC address example
Assumed the MAC address is 00:11:22:aa:bb:cc
Send: 0x 38 30 31 67 35 30 30 30 0D (Get MAC add)
Reply: 0x 32 30 31 72 35 30 30 31 31 32 32 61 61 62 62 63 63 00 00…00 00 0D
4. Get IP address example
Assumed the IP address is 192.168.100.2
Send: 0x 38 30 31 67 36 30 30 30 0D (Get IP address)
Reply: 0x 32 30 31 72 36 31 39 32 2E 31 36 38 2E 31 30 30 2E 32 00 00…00 00 0D
5. Get Serial number example
Assumed the Serial number is ABC180212345
Send: 0x 38 30 31 67 37 30 30 30 0D (Get Serial number)
Reply: 0x 32 30 31 72 37 41 42 43 31 38 30 32 31 32 33 34 35 00 00…00 00 0D
6. Get FW version example
Assumed the FW version is 3.02.001
Send: 0x 38 30 31 67 38 30 30 30 0D (Get FW version)
Reply: 0x 32 30 31 72 38 33 2E 30 32 2E 30 30 31 00 00…00 00 0D

B. Optional Function

Get Function Length ID Command Command Value Range Comments
Type (ASCII) Code
(ASCII)
Code
(Hex)
(Three ASCII bytes)
Get-Contrast 8 g a 61 000 ~ 100
Get-Sharpness 8 g c 63 000 ~ 100
Get-Color 8 g d 64 000 ~ 100
Get-Tint 8 g e 65 000 ~ 100
Get_Backlight On_Off 8 g h 68 000: Off
001: On
Get-PIP Mode 8 g t 74 000: OFF
001: PIP (POP)
002: PBP
Get-PIP Input 8 g u 75 000~100 See Set-input select
Get-Tiling Mode 8 g v 76 000: OFF
001: ON
(for Video wall)
Get-Tiling Compensation 8 g w 77 000: OFF
001: ON
(for Video wall)
Bezel width compensation
Get-Tiling H by V Monitors 8 g x 78 01x~09x: H monitors
0x1~0x9: V monitors
(for Video wall)
1. 2nd digital for H monitors
2. 3rd digital for V monitors
Get-Tiling Position 8 g y 79 000: OFF
001~025
(for Video wall)
Copy the screen of Position# to identified display
Get-Date: Year 8 g 2 32 Y00~Y00 Last 2 digits
(20)17~(20)99
Get-Date: Month 8 g 2 32 M00~M00 2 digits
Get-Date: Day 8 g 2 32 D00~M00 2 digits
Get-Time: Hour 8 g 3 33 H00~H00 24-hr format. 2 digits.
Get-Time: Min 8 g 3 33 M00~M00 2 digits
Get-Time: Sec 8 g 3 33 S00~S00 2 digits
NOTE:
1. Get Date example
Assumed the current date of display#01 as below:
Date: 2017-3/15
Send: 0x 38 30 31 67 32 59 30 30 0D (Get Date:Year)
Reply: 0x 38 30 31 72 32 59 31 37 0D (“Y17”)
Send: 0x 38 30 31 67 32 4D 30 30 0D (Get Date:Month)
Reply: 0x 38 30 31 72 32 4D 30 33 0D (“M03”)
Send: 0x 38 30 31 67 32 44 30 30 0D (Get Date:Day)
Reply: 0x 38 30 31 72 32 44 31 35 0D (“D15”)
2. Get Time example
Assumed the current time of display#01 as below:
Time: 16:27:59
Send: 0x 38 30 31 67 33 48 30 30 0D (Get Time:Hour)
Reply: 0x 38 30 31 72 33 48 31 36 0D (“H16”)
Send: 0x 38 30 31 67 33 4D 30 30 0D (Get Time:Min)
Reply: 0x 38 30 31 72 33 4D 32 37 0D (“M27”)
Send: 0x 38 30 31 67 33 53 30 30 0D (Get Time:Sec)
Reply: 0x 38 30 31 72 33 53 35 39 0D (“S59”)
3. Get RS232 Version example
Assumed the version is 3.0.1
Send: 0x 38 30 31 67 36 30 30 30 0D (Get RS232 version)
Reply: 0x 38 30 31 72 36 33 30 31 0D (“301”)

C. Auto Reply *3.2.1
The display will send out the updated data/status automatically without getting a query from the host whenever the following data/status is changed by the user through any of the available ways like: remote control unit, front keys, or touch screen.

  • Power On/Off
  • Input Select
  • Brightness
  • Backlight
  • Volume
  • Mute On/Off

Remote Control Pass-Through Mode

When the PC sets the Display to Remote Control Pass through mode, the Display shall send a 7-byte packet (followed by “CR”) in response to remote control unit (RCU) button activation. In this mode the remote control shall have no effect on the Display function. For example: “Volume+” will not change the volume of the Display, but instead only sends the “Volume+” code to the PC over the RS-232 port.

IR Pass Through-Function format

Reply: (Command Type="p")

Name Length ID Command Type RCU Code1 (MSB) RCU Code2 (LSB) CR
Byte Count 1 Byte 2 Byte 1 Byte 1 Byte 1 Byte 1 Byte
Bytes Order 1 2~3 4 5 6 7

Example 1: Remote Control Pass-through when “VOL+” key is pressed for Display (#5)

Send (Hex Format)

Name Length ID Command Type RCU Code1 (MSB) RCU Code2 (LSB) CR
Hex 0x36 0x30
0x35
0x70 0x31 0x30 0x0D
Key Code (HEX) Basic
*3.1.1
Optional
*3.1.1
1 01 V
2 02 V
3 03 V
4 04 V
5 05 V
6 06 V
7 07 V
8 08 V
9 09 V
0 0A V
- 0B V
RECALL (LAST) 0C V
INFO (DISPLAY) 0D V
0E
ASPECT (ZOOM, SIZE) 0F V
VOLUME UP (+) 10 V
VOLUME DOWN (-) 11 V
MUTE 12 V
CHANNEL/PAGE UP (+)/BRIGHTNESS+ 13 V
CHANNEL/PAGE DOWN (-)/BRIGHTNESS- 14 V
POWER 15 V
SOURCES (INPUTS) 16 V
17
18
SLEEP 19 V
MENU 1A V
UP 1B V
DOWN 1C V
LEFT (-) 1D V
RIGHT (+) 1E V
OK (ENTER, SET) 1F V
EXIT 20 V
21
22
23
24
25
26
27
28
29
2A
2B
RED (F1) 2C
GREEN (F2) 2D
YELLOW (F3) 2E
BLUE (F4) 2F
NOTE:
1. This IR-pass-through code is different from the RCU key code.
2. Special control sequence for POWER key under IR-pass through mode.
2-1. When Display is OFF and receives the IR POWER code: Display will turn itself on, then forward the POWER code to the host via RS-232.
2-2. When Display is ON and receives the IR POWER code: Display will forward the POWER code to the host via RS-232, then turn off itself.
2-3. When SET-POWER LOCK is enabled, the Display will not respond to POWER key pressing.
3. The VOLUME UP and VOLUME DOWN code will repeatedly output when you press and hold the keys.