Hi,
I have a diagnostic tool that records information. It has some sort of a proprietary interface port on it, just 2 conductors. I can tell one of them is ground. The remote that normally hooks to this interface port has some sort of two way communicatoin with the diagnostic tool. It can send commands to the tool, but mostly the remote outputs to a serial device at a very slow speed. I would prefer not to have to purchase the remote device and make my own so that can get information from the diagnostic tool. I wonder if the tool itself outputs in serial and I just need to hook up to it.
Can the RX and TX pins in a serial interface be combined to a single pin somehow? I really expected to find 3 conductors.
Is there any way of using a DMM to find out if the 2 conductors (one ground) is a serial interface? The resistance between them is about 4.7k. I don't see any voltage on them.
How could/would communication like this occur over 2 conductors that involves slow serial (1200 baud)?
TIA!