User manual

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 10
R E C E I V E M O D E
When a transceiver is not in Transmit or Command mode, it will be in Receive Mode listening for data.
While in Receive Mode, subsequent data of up to 80 bytes can be received every hop (20 ms).
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 Host and
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 6 : 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
Receive Mode
Pending RF
Received
Data in Buffer
Discard Packet
Yes
Broadcast
Packet
Discard Packet
Command/Data
Mode
YES
AT+++
Receive full
packet and
check CRC
Addressed Packet
RF Data
Yes
Yes
Duplicate
Packet
Matching
Destination
MAC
Broadcast Packet Addressed Packet
Yes
Send Packet over
RF
Validate CRC
Transmit Packet Transmit Packet
Yes
Duplicate
Packet
Yes
Decrement
Broadcast
Attempts
Receive ACK
YES
Send Packet over
RF
Send RF
Acknowledge
YES
Broadcast
Attempts = 0
Decrement
Transmit Attempts
Transmit
Attempts = 0
YES