Pololu Qik 2s12v10 - Manual (Page 18)

If you want to daisy-chain a qik with other Pololu devices that use 0x80 as an initial command byte, the
procedure becomes slightly more complicated. You should first transmit the byte 0x80 so that these devices can
automatically detect the baud rate, and only then should you send the byte 0xAA so that the qik can detect the
baud rate. Once all devices have detected the baud rate, Pololu devices that expect a leading command byte of
0x80 should ignore command packets that start with 0xAA, and qiks will ignore command packets that start with
0x80.
Qik 2s12v10 User's Guide © 2001–2012 Pololu Corporation
4. Serial Interface Page 18 of 33