Are you refering to devices connected to the serial port or the serial port itself?
In general there isn't a standard protocol for finding information or communicating to a serial device similar to USB devices.
Most MODEMS are AT command compatable and so can be easily identified. I know that serial mice can be probed too but don't know what information can be determined.
Last edited by michaelk; 12-04-2006 at 08:44 AM.