Command Request Response
device ready axis_id, FF 01 (ready, guiding) or 00 (slewing)
read encoder axis_id, F1 + byte number [0..3] (must start with F4, as it copies the value in the 4 byte buffer for subsequent requests) the requested byte from the int32 value
stop slewing (interrupts the positioning loop) axis_id, F0 06 (ACK) or nothing if not in slewing mode