API operation API frame specifications
XBee/XBee-PRO ZigBee RF Modules User Guide 111
The cmdID frame (API-identifier) indicates which API messages will be contained in the cmdData frame
(Identifier-specific data). Note that multi-byte values are sent big endian. The XBee modules support the
following API frames:
Checksum
To test data integrity, a checksum is calculated and verified on non-escaped data.
To calculate: Not including frame delimiters and length, add all bytes keeping only the lowest 8 bits of the result
and subtract the result from 0xFF.
To verify: Add all bytes (include checksum, but not the delimiter and length). If the checksum is correct, the sum
will equal 0xFF.
API examples
Example: Create an API AT command frame to configure an XBee to allow joining (set NJ to 0xFF). The frame
should look like:
0x7E 0x00 0x05 0x08 0x01 0x4E 0x4A 0xFF 5F
Where
0x0005 = length
API Frame Names API ID
AT Command 0x08
AT Command - Queue Parameter Value 0x09
ZigBee Transmit Request 0x10
Explicit Addressing ZigBee Command Frame 0x11
Remote Command Request 0x17
Create Source Route 0x21
AT Command Response 0x88
Modem Status 0x8A
ZigBee Transmit Status 0x8B
ZigBee Receive Packet (AO=0) 0x90
ZigBee Explicit Rx Indicator (AO=1) 0x91
ZigBee IO Data Sample Rx Indicator 0x92
XBee Sensor Read Indicator (AO=0) 0x94
Node Identification Indicator (AO=0) 0x95
Remote Command Response 0x97
Over-the-Air Firmware Update Status 0xA0
Route Record Indicator 0xA1
Many-to-One Route Request Indicator 0xA3
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