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RX Packet (16-bit address) Frames
Source Address (Bytes 5-6)
MSB (most significant byte) first,
LSB (least significant) last
XTend RF Module User Guide
Start Delimiter
Length
0x7E
MSB
LSB
API Identifier
0x81
RSSI (Byte 7)
Received Signal Strength Indicator -
Hexadecimal equivalent of (-dBm) value.
(For example: If RX signal strength = -40
dBm, "0x28" (40 decimal) is returned)
Frame Data
Checksum
API-specific Structure
1 Byte
Identifier-specific Data
cmdData
bit 0 = ACK
bit 1 = Indicate broadcast
bits 2-7 [reserved]
Options (Byte 8)
RF Data (Byte(s) 9-n)
Up to 2048 Bytes per
packet
API operation
61
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