Set ELM327 to listen

Question

Is there a way to set an ELM327 to listen on the bus?

Apparently, the ELM327 only listens when a command is been sent to wait for the response, but I want to display all the received frames, instead of just the response.

Answer 1

ATMA is the command you want to use. Be warned though; the ELM327 has a very tiny buffer, so you will be presented with a Buffer full error after just a few frames.

If you seriously want to listen to the bus, you either need to use a STN11xx or STN22xx derived OBD-II adapter, or—if it's a CAN bus—a CAN-to-USB adapter.