Table 1—The various packets contain different information. Each packet broadcast over a wireless radio begins with data describing the sender. The HIGH and LOW bits of each number were used because larger 16-bit numbers had to be broken up into two smaller 8-bit numbers in order to be sent using the ZigBee radios.

Send by node Description Received and acted upon by node(s) Packet format
R Accelerometer data (A) C + T [r, AXHIGH, AXLOW, AYHIGH, AYLOW, AZHIGH, AZLOW]
T Signal strength reading (R/T) C [t, SSHIGH, SSLOW]
C Command packet R + T [c, Command, Command_Number]
R Command executed packet C + T [e, Command_Number]
C Data to the computer over the serial (RS-232) port Only the computer [SS1HIGH, SS1LOW, 1, SS0HIGH, SS0LOW, 0, AXHIGH, AXLOW, AYHIGH, AYLOW, AZHIGH, AZLOW]