Gcomm is a serial communications program similar to seyon, but more modern, and easier to use. Works over serial port, via TCP/IP, or a pipe through another program. Supports xmodem/ymodem/zmodem protocols. Visit the gcomm.sourceforge.net home page for
这个是 linux 下的开源代码,不过协议内容是完全相同的:
http://easynews.dl.sourceforge.net/sourceforge/gcomm/gcomm-1.0.tar.gz