Free Software Linux

Last week I was playing around with understanding serial protocol between RFID reader and computer. For a start, I had a windows application which could communicate with RFID reader over USB serial adapter (which is included in device, so device looks like USB device). First, I needed to sniff USB serial traffic under Windows to understand protocol between device and program. Then I wrote a simple script to reformat output from portmon to more readable format, and found out that packets have two byte checksum in them.