2.2 COM Device ID Serial Data Format
All Plug and Play compatible devices shall report device ID at 1200 bit/s second. (This is an artifact of common Serial Mice.) The data format shall be compatible with a receiver set for a nine bit frame: one start bit, 7 data bits (LSB first) and one stop bit. Example compatible formats:
- nine bit frame: one start bit, 7 data bits, no parity, one stop bit
- ten bit frame: one start bit, 7 data bits, no parity, two stop bits
- ten bit frame: one start bit, 7 data bits, Mark parity, one stop bit
- ten bit frame: one start bit, 8 data bits with MSB set to 1; one stop bit.
The Plug and Play ID string formats are defined in section 3.