RS232 Control of a LG43UN700TB computer monitor using CF LAN Bridge

[Michael E]

Hello All,

I just received my 1st CF LAN bridge yesterday and I'm just getting my feet wet. The information regarding the ability of this monitor to perform this is scarce outside of its manual:

My first experiment was to start small and try to just turn the monitor on or off. I set communication parameters as per manual:

Baud rate : 9600 bps (UART)
Data length : 8 bits
Parity : None
Stop bit : 1 bit
Communication code : ASCII code
Use a crossed (reverse) cable - I DON'T THINK THIS APPLIES - I'm using the CF Adapter - RJ12 to male adapter to 3.5mm 3 barrel jack that is connected to the monitor from the CF LAN bridge. I ohmed out the barrels : tip=RxTx Middle is TxRx and lastly ground.

I have successfully established communication with the LAN bridge and have been experimenting with System Commander in an effort to have some initial proof that this monitor even has this capability. I'll explain in detail what I have done so far, and perhaps you may find my error(s). I'm a newbie at this, but am determined to learn as much as possible. I apologize for the length!

I set the com mode under the general tab to "232" - My assumption here from what I have read is "PGM" dumps a stored command or execution into the LAN bridge?

I then selected the rules tab and created a macro "Turn on Monitor" 

Then I selected "Edit" followed by selecting "action builder"

On Action type I selected "On-Board COM" and left the 02 Lan bridge as the target device

In the Data field I entered:  "ka 01 01\r"

Clicked OK and this CF command was created:  

\xF2\x02\xF3TLANSPW\xF4ka 01 01\r\xF5\xF5

When this command is tested, the log produces this:

TO:CFLinkID02 Command TLANSPW DATA: ka 01 01\r

FROM: CFlinkID02 Command: RLANSPW DATA:

So I don't have any return message from the monitor, no operation and don't understand how the "FF" command may be used. 

Any help would be greatly appreciated!!!

 

 

[Terence Lau]

Hi Michael,

Nice to see you here :) and looks like you're getting up to speed with how the hardware is working.

1) LAN Bridge Serial COM Mode
- PGM Mode : Will only accept CFLink formatted protocol - this will be more to communicating and controlling other CF hardware.
- 232 Mode : Accepts all data and usually used for control for any 3rd party devices.

2) \r should be sent as \x0D (or can add another \x0A for testing). The correct command will then be  \xF2\x02\xF3TLANSPW\xF4ka 01 01\x0D\xF5\xF5

[Michael E]

Hello Terry,

Thank you for your reply, I tried the /x0D and added an /x0A - these then were highlighted in a violet color but also didn't turn on the monitor. Should it be as simple as selecting test command or is there something else I'm missing? 

[Terence Lau]

It should be \x0D instead of  /x0D ... maybe it's a typo error? You can also try swapping the Tx and Rx cabling.

[autobahninc]

Good catch on the typo.....I did do it correctly on system commander. 

Success!!! The swapping of t/r lines did the trick.....I had a null modem adapter that I forgot about and that made that swap easy....Thanks for your help!

Off to do more experiments!

Thanks again, 

Michael 

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