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Chapter 6. Specifications
29
Input/Output Port
Pinout
The input/output port provides information about trigger function and shutter
status. All inputs are pulled up to +5V DC through 10k ohm resistors and
filtered with 2200pf ceramic capacitors. Outputs are driven by a 74F374 latch.
The numbers on the trigger connector diagram below correspond with the
numbers given to the definition of each of the pins. The I/O connector is a
female, D-subminiature 9-pin connector.
Input/Output Port with Pin Numbers
1 SHUTTER OPEN OUTPUT
Active high. A high level on this output indicates that the shutter is
completely open. The output is low when the shutter is closed or in
motion.
2 SHUTTER MOVING OUTPUT
Active high. A high level on this output indicates that the shutter is
opening or closing. The output is low when the shutter is completely open
or completely closed. The length of time this signal is held high is specified
in PVCAM
®
or by the Shutter Open Delay and Shutter Close Delay
functions in the software.
3 CAMERA EXPOSING OUTPUT
Active high. A high level on this output indicates that the camera is
exposing (integrating). This output does not include shutter open and
close delay times.
4 FLASH
This pin is a TTL-level output that can be controlled through software by
using the FLASH command.
5 FACTORY SETUP
This pin is used for factory setup only and is not to be utilized by the user.
Driving this pin will disable the camera and cause a PVCAM error.
6 FILTERED TRIGGER INPUT
This input uses a TTL voltage level to trigger the camera. The input is
pulled low to initiate a trigger (default). If nothing is connected to the
input, it is pulled high to prevent the system from getting false triggers. To
change the state of this input see TRIGGER INVERT INPUT (8). (The