UtilitechAS.amsreader-firmware/Samples/HAN Sample Breakdown.md

SAMPLE Data:

[2017-09-12 23.18.43.731 - Received 41 (0x29) bytes] 7E A0 27 01 02 01 10 5A 87 E6 E7 00 0F 40 00 00 00 09 0C 07 E1 09 0C 02 17 12 2A FF 80 00 00 02 01 06 00 00 05 28 B8 0C 7E

Breakdown:

7E: Frame Start flag

A: 4 bits, A = Frame Format Type 3 (0b1010)

0 27: 11 bits, Frame size: 0x27 (39 bytes, excluding start/end flags)

01: Destination Address (Address can be 1-4 bytes. Terminated by LSB=1) 02 01: Source Address (Address can be 1-4 bytes. Terminated by LSB=1)

10: Control Field

5A 87: Header check sequence (HCS) (Check sum calculated from the address bytes, according to RFC 1662)

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Data: 87 E6 E7 00 0F 40 00 00
00 09 0C 07 E1 09 0C 02 17 12 2A FF 80 00 00 02 01 06 00 00 05 28

B8 0C: Frame check sequence (FCS) (Check sum calculated from full frame, excluding flags and FCS, according to RFC 1662)

7E: Frame End flag