Communications

The native identifier of a puck is 1 and the native baud rate is 300, but they have been changed to letters and 4800 baud.

Baud: 4800 (300 native)
DataBits: 8
Parity: none
StopBits: 1
DTR/DSR off:
RTS/CTS: on
XON/XOFF: off

To read the data type $xRD where x is A,B,C,D,E,F,G,H. It should respond: +nnnnn.nn where this is the temperature in Celsius.