Leuze BPS 8 - Page 95

Protocols for position value output
Leuze electronic BPS 8 94
TNT 35/7-24V
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: First marker bar code character (capital letter A, B, C, D or Z)
Data byte 2: Second marker bar code character (digit from 0…9)
Data byte 3: Third marker bar code character (digit from 0…9)
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
h
= 001000001
b
Data byte 2= 0 = 30
h
= 000110000
b
Data byte 3= 1 = 31
h
= 000110001
b
Byte no. Designation Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Status byte 0 D M A1 A0 QT1 QT0 OUT ERR
1 Data byte 1 001000001
2 Data byte 2 000110000
3 Data byte 3 000110001
4 XOR combination Bitwise exclusive OR combination of bytes 0 to 3
5 Repetition of data byte 1 001000001
6 Repetition of data byte 2 000110000
7 Repetition of data byte 3 000110001