19
Incremental decoder
The decoder consists of a 12 bit counter. The counter uses the 3 hardware inputs.
INC0
Trigger
Value
INC1
INC Rst
IncTrigger
Counter w.
Direction
Detection
Comparator
Figure 15 Incremental decoder
Input 1 is used for counting, input 2 for detecting the direction of rotation and input 3
for the reset signal. It counts upwards, if INC1 is "high" and during a rising edge for
INC0. It counts downwards, if INC1 is "low" and during a rising edge for INC0. The
counter can also be reset by command. The counter status can be read out.
When the counter reaches the comparator value, that can also be set by register, the
output of the comparator is set, an internal trigger signal is generated and image
capture activated. The camera must be configured for „external triggering“ for this to
work.
The trigger signal is generated once the counter status reaches the comparator value.
A detailed register description can be found in
Advanced features
6.5.2
Outputs
The camera has 3 inverting outputs with open collectors. These are shown with external
wiring in the following diagram:
1
2
4
3
Q1
BC817
2k7
Camera internal
Rextern
2k2 / 1k / 470
+24V / +12V / +5V
GND
Camera external
GPOutput_GND
GPOutput
Figure 16 Camera outputs diagram