Hi All,

I recently purchased a Cochran EMC-20H which uses a FTDI USB chip to interface with the dive computer. I'm trying to initiate a conversation with the device using my own code to see if my understanding of the protocol is correct. I'm not getting what I expect and I think it has to do with my lack of understanding how the FTDI chip normally interfaces with devices like this. Is there anyone who can help me figure out what is wrong with the communication method?

I've tried:

cu -l /dev/ttyUSB0 -s .... -e -o and I get a stream of the same wrong character (~).

libftdi using ftdi_write_data and ftdi_read_data and I'll get FFs some 00s

C language write/read using serial interface

I've captured a conversation using USBLyzer on Windows 7 and if my understanding of the data is correct I know some of the protocol but I have yet to receive anything that looks like good data using any of the methods I've tried.

John Van Ostrand

At large on sabbatical