The RS-232 protocol enables direct communication between an LG TV and external devices such as computers, AV controllers, or automation systems. Using RS-232 commands, you can manage essential TV functions—like power, input source, and volume—without a remote control.
All RS-232 control information is included in your TV’s Owner’s Manual. To view or download the full version, visit User's Manual and enter your TV model number, then select Owner’s Manual (PDF).
Below are hexadecimal codes representing standard remote control button functions used in RS-232 commands:
| Code (Hexa) | Function | Note |
|---|---|---|
| 00 | CH +, PR + | R/C Button |
| 01 | CH -, PR - | R/C Button |
| 02 | Volume + | R/C Button |
| 03 | Volume - | R/C Button |
| 06 | > (Arrow Key / Right Key) | R/C Button |
| 07 | < (Arrow Key / Left Key) | R/C Button |
| 08 | Power | R/C Button |
| 09 | Mute | R/C Button |
| 0B | Input | R/C Button |
| 0E | SLEEP | R/C Button |
| 0F | TV, TV/RAD | R/C Button |
| 10 - 19 | * Number Key 0 - 9 | R/C Button |
| 1A | Q.View / Flashback | R/C Button |
| 1E | FAV (Favorite Channel) | R/C Button |
| 20 | Text (Teletext) | R/C Button |
| 21 | T. Opt (Teletext Option) | R/C Button |
| 28 | Return (BACK) | R/C Button |
| 30 | AV (Audio / Video) Mode | R/C Button |
| 39 | Caption/Subtitle | R/C Button |
| 40 | Λ (Arrow Key / Cursor Up) | R/C Button |
| 41 | V (Arrow Key / Cursor Down) | R/C Button |
| 42 | My Apps | R/C Button |
| 43 | Menu / Settings | R/C Button |
| 44 | OK / Enter | R/C Button |
| 45 | Q.Menu | R/C Button |
| 4C | List, - | R/C Button |
| 4D | PICTURE | R/C Button |
| 52 | SOUND | R/C Button |
| Code (Hexa) | Function | Note |
|---|---|---|
| 53 | List | R/C Button |
| 5B | Exit | R/C Button |
| 60 | PIP(AD) | R/C Button |
| 61 | Blue | R/C Button |
| 63 | Yellow | R/C Button |
| 71 | Green | R/C Button |
| 72 | Red | R/C Button |
| 79 | Ratio / Aspect Ratio | R/C Button |
| 91 | AD (Audio Description) | R/C Button |
| 9E | LIVE MENU | R/C Button |
| 7A | User Guide | R/C Button |
| 7C | Smart / Home | R/C Button |
| 7E | SIMPLINK | R/C Button |
| 8E | ►► (Forward) | R/C Button |
| 8F | ◄◄ (Rewind) | R/C Button |
| AA | Info | R/C Button |
| AB | Program Guide | R/C Button |
| B0 | ► (Play) | R/C Button |
| B1 | ꕗ (Stop / File List) | R/C Button |
| B5 | RECENT | R/C Button |
| BA | ꕘ (Freeze / Slow Play /cPause) | R/C Button |
| BD | (REC) | R/C Button |
| DC | 3D | R/C Button |
| 99 | AutoConfig | R/C Button |
| 9F | App / * | R/C Button |
| 9B | TV / PC | R/C Button |
* Key code 4C (0x4C) is available on ATSC/ISDB models which use major/minor channel. (For South Korea, Japan, North America, Latin America except Colombia models)
The RS-232 connection types supported by LG TVs include:
USB Type
DE9 (D-Sub 9-pin) Type
Phone Jack Type
Customer Computer
RS-232C configurations
3-Wire Configurations(Not standard)
This ensures unique control for each TV connected through RS-232.
| Parameter | Value |
|---|---|
| Baud Rate | 9600 bps |
| Data Length | 8 bits |
| Parity | None |
| Stop Bit | 1 |
| Code Type | ASCII |
| Cable Type | Crossed (Reverse) cable |
(Depending on model)
| COMMAND1 | COMMAND2 | DATA (Hexadecimal) |
|
|---|---|---|---|
| 01. Power* | k | a | 00 to 01 |
| 02. Aspect Ratio | k | c | (p.7) |
| 03. Screen Mute | k | d | (p.7) |
| 04. Volume Mute | k | e | 00 to 01 |
| 05. Volume Control | k | f | 00 to 64 |
| 06. Contrast | k | g | 00 to 64 |
| 07. Brightness | k | h | 00 to 64 |
| 08. Color/Colour | k | i | 00 to 64 |
| 09. Tint | k | j | 00 to 64 |
| 10. Sharpness | k | k | 00 to 32 |
| 11. OSD Select | k | l | 00 to 01 |
| 12. Remote Control Lock Mode | k | m | 00 to 01 |
| 13. Treble | k | r | 00 to 64 |
| 14. Bass | k | s | 00 to 64 |
| 15. Balance | k | t | 00 to 64 |
| 16. Color(Colour) Temperature | x | u | 00 to 64 |
| 17. ISM Method (Only Plasma TV) | j | p | (p.8) |
| 18. Equalizer | j | v | (p.9) |
| 19. Energy Saving | j | q | 00 to 05 |
| 20. Tune Command | m | a | (p.9) |
| 21. Channel(Programme) Add/Del(Skip) | m | a | (p.9) |
| 22. Key | m | c | Key Codes |
| 23. Control Backlight, Control Panel Light | m | g | 00 to 64 |
| 24. Input select (Main) | x | b | (p.11) |
| 25. 3D (Only 3D models) | x | t | (p.11) |
| 26. Extended 3D (Only 3D models) | x | v | (p.12) |
| 27. Auto Configure | j | u | (p.12) |
During playing or recording media, all commands except Power (ka) and Key (mc) are not executed and treated as NG.
With RS232C cable, TV can communicate "ka command" in power-on or power-off status. but with USB-to-Serial converter cable, the command works only if TV is on.
To control Power *On or Off of the set.
Transmission[k][a][ ][Set ID][ ][Data][Cr]
Data 00 : Power Off 01 : *Power On
Ack [a][ ][Set ID][ ][OK/NG][Data][x]
To Show TV is Power On or *Off
Transmission [k][a][ ][Set ID][ ][FF][Cr]
Ack [a][ ][Set ID][ ][OK][Data][x]
Similarly, if other functions transmit ‘FF’ data based on this format, Acknowledgement feedback presents status about each function.
To adjust the screen format. (Main picture format) You can also adjust the screen format using the Aspect Ratio in the Q.MENU. or PICTURE menu.
Transmission [k][c][ ][Set ID][ ][Data][Cr]
Data 01 : Normal screen (4:3)
02 : Wide screen (16:9)
04 : Zoom
05 : Zoom 2
(Latin America
except Colombia
Only)
06 : Set by Program/
Original
07 : 14:9
(Europe, Colombia, Mid-East,
Asia except South Korea and
Japan)
09 : * Just Scan
0B : Full Wide
(Europe, Colombia, MidEast, Asia except South
Korea and Japan)
10 to 1F : Cinema Zoom 1 to 16
0c : 21:9 (Depending on model)
Ack [c][ ][Set ID][ ][OK/NG][Data][x]
To adjust the screen format. (Main picture format) You can also adjust the screen format using the Aspect Ratio in the Q.MENU. or PICTURE menu.
Transmission [k][c][ ][Set ID][ ][Data][Cr]
Data 00 : Screen mute off (Picture on)
Video mute off
01 : Screen mute on (Picture off)
10 : Video mute on
Ack [d][ ][Set ID][ ][OK/NG][Data][x]
In case of video mute on only, TV will display On Screen Display(OSD). But, in case of Screen mute on, TV will not display OSD.
To control volume mute on/off. You can also adjust mute using the MUTE button on remote control.
Transmission [k][e][ ][Set ID][ ][Data][Cr]
Data 00 : Volume mute on (Volume off)
01 : Volume mute off (Volume on)
Ack [e][ ][Set ID][ ][OK/NG][Data][x]
To adjust volume. You can also adjust volume with the volume buttons on remote control.
Transmission [k][f][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [f][ ][Set ID][ ][OK/NG][Data][x]
To adjust screen contrast. You can also adjust contrast in the PICTURE menu.
Transmission [k][f][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [g][ ][Set ID][ ][OK/NG][Data][x]
To adjust screen brightness. You can also adjust brightness in the PICTURE menu.
Transmission [k][h][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [h][ ][Set ID][ ][OK/NG][Data][x]
To adjust the screen Color(Colour). You can also adjust colour in the PICTURE menu.
Transmission [k][i][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [i][ ][Set ID][ ][OK/NG][Data][x]
To adjust the screen tint. You can also adjust tint in the PICTURE menu
Transmission [k][j][ ][Set ID][ ][Data][Cr]
Data Red : 00 to Green : 64
Ack [j][ ][Set ID][ ][OK/NG][Data][x]
To adjust the screen sharpness. You can also adjust sharpness in the PICTURE menu.
Transmission [k][k][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 32
Ack [k][ ][Set ID][ ][OK/NG][Data][x]
To select OSD (On Screen Display) on/off when controlling remotely.
Transmission [k][l][ ][Set ID][ ][Data][Cr]
Data 00 : OSD off 01 : OSD on
Ack [l][ ][Set ID][ ][OK/NG][Data][x]
To lock the front panel controls on the monitor and remote control.
Transmission [k][m][ ][Set ID][ ][Data][Cr]
Data 00 : Lock off 01 : Lock on
Ack [m][ ][Set ID][ ][OK/NG][Data][x]
To adjust treble. You can also adjust in the AUDIO menu.
Transmission [k][r][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [r][ ][Set ID][ ][OK/NG][Data][x]
(Depending on model)
To adjust Bass. You can also adjust in the AUDIO menu.
Transmission [k][s][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [s][ ][Set ID][ ][OK/NG][Data][x]
(Depending on model)
To adjust balance. You can also adjust balance in the AUDIO menu.
Transmission [k][t][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [t][ ][Set ID][ ][OK/NG][Data][x]
To adjust colour temperature. You can also adjust Color(Colour) Temperature in the PICTURE menu.
Transmission [x][u][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [u][ ][Set ID][ ][OK/NG][Data][x]
To control the ISM method. You can also adjust ISM Method in OPTION menu.
Transmission [j][p][ ][Set ID][ ][Data][Cr]
Data Min : 02: Orbiter
08: Normal
20: Color(Colour) Wash
Ack [p][ ][Set ID][ ][OK/NG][Data][x]
Adjust EQ of the set.
Transmission [j][v][ ][Set ID][ ][Data][Cr]
| 7 | 6 | 5 | Frequency | 4 | 3 | 2 | 1 | 0 | Step |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 1st Band | 0 | 0 | 0 | 0 | 0 | 0(decimal) |
| 0 | 0 | 1 | 2nd Band | 0 | 0 | 0 | 0 | 1 | 1(decimal) |
| 0 | 1 | 0 | 3rd Band | ... | ... | ... | ... | ... | ... |
| 0 | 1 | 1 | 4th Band | 1 | 0 | 0 | 1 | 1 | 19(decimal) |
| 0 | 0 | 0 | 1st Band | 0 | 0 | 0 | 0 | 0 | 0(decimal) |
Acknowledgement [v][ ][Set ID][ ][OK/NG][Data][x]
It depends on model, and can adjust when sound mode is EQ adjustable value.
To reduce the power consumption of the TV. You can also adjust Energy Saving in PICTURE menu.
Transmission [j][p][ ][Set ID][ ][Data][Cr]
Data
00 : Off
01 : Minimum
02 : Medium
03 : Maximum
04 : Auto (For LCD TV / LED TV) /
Intelligent sensor (For PDP TV)
05 : Screen off
(Depending on model)
Ack [p][ ][Set ID][ ][OK/NG][Data][x]
This command may work differently depending on model and signal.
For Europe, Mid-East, Colombia, Asia except South Korea and Japan Model
Select channel to following physical number
Transmission [m][a][ ][Set ID][ ][Data 00][ ] [Data 01][ ][Data 02][Cr]
Data
00 : Off
01 : Minimum
02 : Medium
03 : Maximum
04 : Auto (For LCD TV / LED TV) /
Intelligent sensor (For PDP TV)
05 : Screen off
(Depending on model)
Ack [p][ ][Set ID][ ][OK/NG][Data][x]
[Data 00][Data 01] Channel Data
Data 00 : High byte channel data
Data 01 : Low byte channel data
00 00 ~ 00 C7 (Decimal : 0 ~ 199)
Data 02 : Input Source (Analog)
* Digital Antenna/Cable/Satellite
[Data 00][Data 01]: Channel Data
Data 00 : High Channel data
Data 01 : Low Channel data
00 00 ~ 27 0F (Decimal: 0 ~ 9999)
Data 02 : Input Source (Digital)
Set ID = All = 00
Data 00 & 01 = Channel Data is 10 = 00 0a
Data 02 = Analog Antenna TV = 00
Result = ma 00 00 0a 00
Set ID = All = 00
Data 00 & 01 = Channel Data is 1 = 00 01
Data 02 = Digital Antenna TV = 10
Result = ma 00 00 01 10
Set ID = All = 00
Data 00 & 01 = Channel Data is 1000 = 03 E8
Data 02 = Digital Satellite TV = 40
Result = ma 00 03 E8 40
Ack [a][ ][Set ID][ ][OK][Data 00][Data 01] [Data 02][x][a][ ][Set ID][ ][NG][Data 00][x]
Transmission [m][a][ ][0][ ][Data00][ ][Data01] [ ][Data02][ ][Data03][ ][Data04][ ][Data05][Cr]
Digital channels have a Physical, Major, and Minor channel number. The Physical number is the actual digital channel number, the Major is the number that the channel should be mapped to, and the Minor is the sub-channel. Since the ATSC tuner automatically maps the channel from the Major / Minor number, the Physical number is not required when sending a command in Digital.
Data 00 : Physical Channel Number
[Data 01 ~ 04]: Major/Minor Channel Number
Data 01 & 02: xx (Don't care)
Data 03 & 04: xx (Don't care)
Data 05: Input Source (Analog)
Data 00 : xx (Don't care)
[Data 01][Data 02]: Major Channel Number
Data 01 : High byte Channel Data
Data 02 : Low byte Channel Data
[Data 03][Data 04]: Minor Channel Number
Data 03 : High byte Channel Data
Data 04 : Low byte Channel Data
Data 05 : Input Source (Digital)
Two bytes are available for each major and minor channel data, but usually the low byte is used alone (high byte is 0).
Tune to the Analog cable (NTSC) channel 35.
Tune to the digital antenna (ATSC) channel 30-3.
Ack [a][ ][Set ID][ ][OK][Data 00][Data 01] [Data 02][Data 03][Data 04][Data 05] [x][a][ ][Set ID][ ][NG][Data 00][x]
To tune channel to following physical/major/minor number.
Transmission [m][a][ ][0][ ][Data00][ ][Data01] [ ][Data02][ ][Data03][ ][Data04][ ][Data05][Cr]
Tune to the Analog cable (NTSC) channel 35.
Tune to the digital antenna (ATSC) channel 30-3.
Ack [a][ ][Set ID][ ][OK][Data 00][Data 01] [Data 02][Data 03][Data 04][Data 05] [x][a][ ][Set ID][ ][NG][Data 00][x]
To tune channel to following physical/major/minor number.
Transmission [m][a][ ][0][ ][Data00][ ][Data01] [ ][Data02][ ][Data03][ ][Data04][ ][Data05][Cr]
Data 00: xx (Don't care)
[Data 01][Data 02]: Major Channel Number
Data 01: High byte Channel Data
Data 02: Low byte Channel Data
[Data 03][Data 04]: Minor/Branch Channel Number (Don’t care in Satellite)
Data 03: High byte Channel Data
Data 04: Low byte Channel Data
Data 05 : Input Source (Digital/Satellite for Japan)
Channel Number Only (One Part Channel)
Number Only (One Part Channel)
Tune to the digital antenna (ISDB-T) channel 17-1.
This feature is varied based on the model.
Ack [a][ ][Set ID][ ][OK][Data 00][Data 01] [Data 02][Data 03][Data 04][Data 05] [x][a][ ][Set ID][ ][NG][Data 00][x]
Tune to the digital antenna (ATSC) channel 30-3.
Ack [a][ ][Set ID][ ][OK][Data 00][Data 01] [Data 02][Data 03][Data 04][Data 05] [x][a][ ][Set ID][ ][NG][Data 00][x]
To tune channel to following physical/major/minor number.
Transmission [m][a][ ][0][ ][Data00][ ][Data01] [ ][Data02][ ][Data03][ ][Data04][ ][Data05][Cr]
To skip current channel(programme) for next time.
Transmission [m][b][ ][Set ID][ ][Data][Cr]
Data 00 : Del(ATSC,ISDB)/Skip(DVB) 01 : Add
Ack [b][ ][Set ID][ ][OK/NG][Data][x]
Set the saved channel status to del(ATSC, ISDB) / skip(DVB) or add.
To send IR remote key code.
Transmission [m][c][ ][Set ID][ ][Data][Cr]
Data Key code - p.2.
Ack [c][ ][Set ID][ ][OK/NG][Data][x]
To control the backlight
Transmission [m][g][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [g][ ][Set ID][ ][OK/NG][Data][x]
Control Panel Light (Command: m g)
To control the panel light.
Transmission [m][g][ ][Set ID][ ][Data][Cr]
Data Min : 00 to Max : 64
Ack [g][ ][Set ID][ ][OK/NG][Data][x]
(Main Picture Input)
To select input source for main picture.
Transmission [x][b][ ][Set ID][ ][Data][Cr]
Data
Ack [b][ ][Set ID][ ][OK/NG][Data][x]
This function depends on model and signal.
(Depending on model)
To change 3D mode for TV.
Transmission [x][t][ ][Set ID][ ][Data 00][ ][Data 01] [ ][Data 02][ ][Data 03][Cr]
Data Key code - p.2.
(Depending on model)
Data Structure
| [Data 00] | [Data 01] | [Data 02] | [Data 03] |
|---|---|---|---|
| 00 | O | O | O |
| 01 | X | X | X |
| 02 | X | X | X |
| 03 | X | O | O |
X : don’t care
Ack [t][ ][Set ID][ ][OK][Data00][Data01][Data02] [Data03][x] [t][ ][Set ID][ ][NG][Data00][x]
To change 3D option for TV.
Transmission [x][v][ ][Set ID][ ][Data 00][ ] [Data 01][Cr]
When [Data 00] is 00
When [Data 00] is 01, 02 Data Min: 0 - Max: 14 (*transmit by Hexadecimal code)
When [Data 00] is 06, 07
When [Data 00] is 08
When [Data 00] is 09
Ack [v][ ][Set ID][ ][OK][Data00][Data01][x] [v][ ][Set ID][ ][NG][Data00][x]
To adjust picture position and minimize image shaking automatically. It works only in RGB (PC) mode.
Transmission [j][u][ ][Set ID][ ][Data][Cr]
Data 01 : To set Auto Configure
Ack [u][ ][Set ID][ ][OK/NG][Data][x]
Transmission
[Command1][Command2][ ][Set ID][ ][Data][Cr]
OK Acknowledgement
[Command2][ ][Set ID][ ][OK][Data][x]
The set transmits ACK (acknowledgement) based on this format when receiving normal data. At this time, if the data is data read mode, it indicates present status data. If the data is data write mode, it returns the data of the PC computer.
Error Acknowledgement
[Command2][ ][Set ID][ ][NG][Data][x]
The set transmits ACK (acknowledgement) based on this format when receiving abnormal data from non-viable functions or communication errors.
Data 00: Illegal Code
Real data mapping (Hexadecimal b Decimal)
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