User`s manual

Example of analysis for packet received

Data received (hexadecimal)

10H 02h

00h 13h 00h 00h 31h 32h 33h 34h 35h 36h 37h 38h 0Dh C4h 18h 10h 03h

(1) Compare data lengths.

Data length received in packet: 0013h = 19 bytes

Data received in packet: 19 bytes

(2) Compare CRCs.

1) Initialize CRC to 0.

2) Retrieve the first data byte (00h).

3) Shift the current CRC value one bit to the left. If the shift produces overflow, XOR the result with 1021h.

4) Shift the data byte one bit to the left. If the shift produces overflow, XOR the current CRC value with 0001h.

5) Repeat steps 3) and 4) a total of 8 times.

6) Retrieve the second data byte (13h).

7) Repeat steps 3) and 4) a total of 8 times.

8) Repeat this calculation through to the final byte.

9) Finally repeat the calculation for the two bytes (C4h 18h) in the CRC storage area, but reverse them first

because the 16-bit CRC is stored in little-endian order.

Data CRC

-- 0000h

00h 0000h

13h 1300h

00h 0013h

00h 221Ah

31h 8EF9h

32h 58C0h

33h F554h

34h 2054h

35h 2181h

36h A3A0h

37h 92A9h

38h 0059h

0Dh C244h

18h 1CE2h

C4h 0000h

(3) A result of 0000h indicates a successful transfer; a nonzero one, an error.

Transfer data Spare

Number of

data bytes

CRC Header Terminator

Container

numbe