Starting up the device – Basic configuration
Leuze electronic GmbH + Co. KG
BPS 307i
52
3
1
2
5
7
9
9
10
8
4
6
1
CLOCK
2
DATA
3
Clock sequence
4
First HIGH-LOW edge
5
Change LOW level to HIGH level
6
Bias level (HIGH)
7
T
SSI
(1/f
SSI
)
8
T
m
= 20 µs or 30 µs
9
MSB
10 LSB (0)
Fig. 8.1:
SSI data transmission sequence diagram
NOTICE
If the off-cycle of data transmission is interrupted for longer than t
m
= 20 µs or t
m
= 30 µs , a com-
pletely new transmission cycle starts on the next cycle.
If a new transmission cycle is started before time t
m
elapses, the previous value is output again.
NOTICE
Factory setting: only positive position and speed values with SSI!
Ä
In the factory setting, the SSI interface can only represent positive position and speed val-
ues.
If negative output values are ascertained due to the orientation of the BPS to the BCB or the
counting direction, the value
0
is output at the SSI interface!
In the event of a number overflow, all data bits are set to
1
.
Factory settings of the SSI interface parameters
• Data encoding of the measurement values:
Gray
• Sign:
binary representation
• Transmission mode: 24 measurement bits + 1 error bit
• Resolution position value: 1 mm
• Error bit: measurement error, LSB,
1
= active
• Value of the error bit:
The error bit is not included in the Gray encoding of the measurement value.
The error bit is
1
= active
• Update rate: 2 ms
• SSI master clock frequency: 80 kHz - 600 kHz
