User's Manual

CONFIDENTIAL AND PROPRIETARY
The Information contained in this document shall remain the sole exclusive property of s.m.s smart microwave sensors GmbH and shall not
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UMRR-0F0002-1F0902-030B00 General Purpose USA Version 1 I Page 15 of 23 I November 13, 2014
Table 3: RS485 message structure
Byte\Bit
7
6
5
4
3
2
1
0
0
Start sequence (4 x UINT8)
0xCA
1
0xCB
2
0xCC
3
0xCD
x
Data payload (n x UINT8)
x
x
x
x
x
x
x
0
XOR Checksum (UINT8)
1
End sequence (4 x UINT8)
0xEA
2
0xEB
3
0xEC
4
0xED
Every data message consists of its own message ID, the number of used data bytes and the
data bytes itself.
The checksum is calculated on all data except the start sequence and the end sequence. The
Checksum is a simple XOR Assignment of all n data bytes.
Byte0 XOR Byte1 XOR Byte2 ... XOR Byte (n-1)