Send command to ELM327 via USB and get the answer in a $VAR?

WarumLinuxBesserIst · 12-13-2020, 07:15 AM

Hello,

I am looking for a solution, to send a command to my ELM327 device, connected via /dev/ttyUSB0

I figured out, that I can connect by the command:
screen /dev/ttyUSB0

There I can type a for example: 01 01
and I will receive an answer.

But I am looking for a solution, to send this 01 01 command via bash script and fetch the answer in a $VAR
so I can analyze this data in a bash script.

And idea?

Thanks Alex

michaelk · 12-13-2020, 08:31 AM

I have always found communications more reliable using a "real" programming language with a serial port. I would suggest trying python and it is possible to write a script to just send and receive data to be processed by bash. What makes serial communications difficult in bash is determining if you have received all of the bytes as sent by the device.

There is existing software for reading OBD data and it looks like this works with the ELM327.

http://www.obdtester.com/pyobd