C H A P T E R 4 - T H E O R Y O F O P E R A T I O N
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w w w . b l a c k b o x . c o m
C O M M A N D M O D E
A radio will enter Command Mode when data is received over the serial interface from the OEM Hostand
contains the “AT+++” (Enter AT Command Mode) command. Once in Command Mode, all data received by
the radio is interpreted as command data. Command Data can be either EEPROM Configuration or On-The-
Fly commands.
F I G U R E 1 0 : P E N D I N G R F A N D D A T A I N B U F F E R F L O W
Receive Mode
Broadcast
Packet
Receive full
packet and
check CRC
Addressed Packet
Matching
Destination
MAC
Validate CRC
Duplicate
Packet
Send RF
Acknowledge
Send Packet over
RF
Duplicate
Packet
Discard Packet
Discard Packet
Send Packet over
RF
Pending RF
Received
Yes
Yes
Yes
Yes
Yes
Yes
Receive Mode
Data in Buffer
AT+++
RF Data
Broadcast Packet
Addressed Packet
Transmit Packet
Transmit Packet
Decrement
Broadcast
Attempts
Broadcast
Attempts = 0
Receive ACK
Decrement
Transmit Attempts
Transmit
Attempts = 0
Command/Data
Mode
YES
YES
YES
YES
