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
be disclosed by the recipient to third parties without prior consent of s.m.s smart microwave sensors GmbH in writing.
UMRR-0Axxxx Type31 Operational Description.docx Version 1
I
Page 14
of 19
I
August 22, 2013
Table 2: 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)
