How can I monitor data on a serial port in Linux?

Question

I\'m debugging communications with a serial device, and I need to see all the data flowing both directions.

It seems like this should be easy on Linux, where the serial

Answer 1

Much like @MBR, I was looking into serial sniffers, but the ptys broke the parity check. However, his sniffer was not helping me, as I'm using a CP2102, and not a FT232. So I wrote my own sniffer, by following this, and now I have one that can record file I/O on arbitrary files: I called it tracie.