In the current network, there's 1 master device, which gathers data from over 20 devices. Nameplate says the baud rate is 2400. In the bus cable there's one data wire, 12V and GND. A friend of mine connected oscilloscope to Data-GND and checked there's 0-12V voltage level.
I want to reverse engineer the protocol used, so I'd like to connect my PC to check byte frames. Is it safe to connect Data to RxD and GND to GND of COM port, or will I damage the ports by connecting it that way?
I used UART and inverted Rx cause it looked somewhat reasonable. Afterwards I connected Data and GND to usb/TTL converter to hopefully get some data to work on, but sadly serial port monitors show nothing... Any idea how can I capture the signal?