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ago in Vehicle tracking by

Good day,

I am trying to implement codec 12 to try and poll a device on rs485 using a fmb125 as per this documentation:

Now the example message GETINFO is working and replies to me.

I send:

and get a response:



`{00}{00}{00}{00}{00}{00}{00}™{0C}{01}{06}{00}{00}{00}‘RTC:2021/1/11 4:4 Init:2021/1/11 3:49 UpTime:939s PWR:PwrVoltage RST:0 GPS:3 SAT:6 TTFF:84 TTLF:84 NOGPS:0:0 SR:0 FG:0 FL:0 SMS:0 REC:6 MD:4 DB:0{01}{00}{00})`

Now when I try and send my own custom message (modbus via rs485)

 I send:
'00 00 00 00 00 00 00 10 0C 01 05 00 00 00 08 65 03 00 01 00 08 1D E8 01 00 00 DA 8B'

I then see my device flash (it gets the message and responds). 

However I do not get any message or response back on the server, I can even try writing to the serial port from my pc, and it doesn't send anything to the server.

Here is the device settings:

I have been looking in the logs to see why i'ts maybe not replying and I can see this:

What would cause this error?

What am I missing here?


ago by
Anyone had similar issues or anything I can try,

I have run out of options to try...

1 Answer

0 votes
ago by

Hello Zapnologica, 

Good day. Thank you for your question.

We require more information before we can provide you with a detailed answer to this. I would suggest that you raise a ticket on VIP Helpdesk or contact your distributor/Sales manager to assist you with this. If you don't have any contacts with our Sales managers, you may reach them at our official website (please select "Vehicle Telematics" as your topic or you can send an e-mail with the description of your situation to

Thank you for your understanding.

Kind regards.

ago by

Please advise as to what additional information you might need.

I have sent an email with the details to