Leuze BPS 8 - Page 91

Protocols for position value output
Leuze electronic BPS 8 90
TNT 35/7-24V
Diagnostic data
If the diagnostic bit D in the status byte is set to 1, diagnostic data is present and may be
retrieved.
The diagnostic data are retrieved by setting the bit D (bit 0) in the request byte. The diag-
nostic bit D remains set to 1 as long as data are present. Only after the memory for diag-
nostic data is empty, the bit changes to 0 and the red status LED returns to normal mode.
Like the marker data, the diagnostic data are output as an ASCII hex value in the data bytes
2…4.
Data byte 2: First diagnostic data character
Data byte 3: Second diagnostic data character
Data byte 4: Third diagnostic data character
Possible diagnostic data:
E01 = interface problem
E02 = motor problem
E03 = laser problem
E04 = internal problem
E05 = position value outside of measurement range
E09 = invalid control bar code
If bit 2 SLEEP is set to 1 in the request byte and in the status byte bit 2 D has the value 1,
BPS 8 is in Standby mode (SLEEP – laser and polygon wheel motor off). If bit 2 SLEEP in
the control byte is set to 0, the BPS 8 returns to positioning mode after a boot time of approx.
5s. If polling takes place while the BPS 8 boots and there is no valid position data yet, the
error message No decodable bar code (bit OUT) is generated.
Example: output of diagnostic data
Diagnostic data: E05
Data byte 2 = E = 45
h
= 01000101
b
Data byte 3 = 0 = 30
h
= 00110000
b
Data byte 4 = 5 = 35
h
= 00110101
b
Byte no. Designation Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Status byte 0 Q1 Q0 SLEEP MM D OUT ERR
1 Data byte 1 00000000
2 Data byte 2 01000101
3 Data byte 3 00110000
4 Data byte 4 00110101
5 XOR combination Exclusive OR combination of bytes 0 to 4