Leuze electronic BPS 8 Original Operating Instructions page 96

Marker bar code
If information consisting of one of the capital letters A / B / C / D / Z and two digits is read,
the MM bit for the recognition of a marker bar code is set in the status byte:
0 = No marker data in the memory.
1 = Marker data in the memory.
The data content of the marker bar code can now be retrieved in the request telegram using
the request bit S0. If the data content of the marker bar code is not requested, the position
continues to be output.
The marker data are output as an ASCII hex value in the data bytes 1 ... 3.
Data byte 1:
Data byte 2:
Data byte 3:
If no marker data are present in the memory of the BPS 8 and there is a marker data request,
E00 is transmitted.
For more detailed information on marker bar codes, see see chapter 5.3 "Marker bar codes"
on Page 27.
Example: output of marker data
Marker bar code: A01
Data byte 1= A = 41
Data byte 2= 0 = 30
Data byte 3= 1 = 31
Byte no. Designation
0 Status byte
1 Data byte 1
2 Data byte 2
3 Data byte 3
4 XOR combination
5 Repetition of data byte 1
6 Repetition of data byte 2
7 Repetition of data byte 3
Leuze electronic
First marker bar code character (capital letter A, B, C, D or Z)
Second marker bar code character (digit from 0 ... 9)
Third marker bar code character (digit from 0 ... 9)
= 001000001
h b
= 000110000
h b
= 000110001
h b
Bit 8 Bit 7
0 D
0 0
0 0
0 0
Bitwise exclusive OR combination of bytes 0 to 3
0 0
0 0
0 0
BPS 8
Protocols for position value output
Bit 6 Bit 5 Bit 4
M A1 A0
1 0 0
0 1 1
0 1 1
1 0 0
0 1 1
0 1 1
Bit 3 Bit 2 Bit 1 Bit 0
QT1 QT0 OUT ERR
0 0 0 1
0 0 0 0
0 0 0 1
0 0 0 1
0 0 0 0
0 0 0 1
94