Z-Trak2 3D Profiler Sensors
Technical specifications
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121
Input switching points and propagation delay
t
User Input Signal
t
ocr
t
ocf
V
From User
Interface
Connector
EMI
Filter
FPGA
Input
Switch point
FPGA Input
t
t
eth
t
etl
Figure 31. Input switching points and propagation delay diagram. t
ocr
: opto-coupler propagation delay on
rising edge; t
eth
: time external trigger high (min pulse width high); t
ocf
: opto-coupler propagation delay on
falling edge; t
etl
: time external trigger low (min pulse width low).
Trigger Level
Switch Point
t
ocr
(µs)
propagation delay
on rising edge
t
eth
(µs)
min pulse width
high
t
ocf
(µs)
propagation delay
on falling edge
t
etl
(µs)
min pulse width
low
RS-422
1.6 V
3
4
2
2
TTL
1.6 V
3
4
3
3
12V
6 V
3
3
2
3
24V
12 V
2
2
4
4