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PIO-100 (REV 6) - Parallel Port Inteface Board
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PIO-100 board fans out the IBM PC parallel port to separate RJ-45 connectors,
with opto-isolation and voltage level balancing to simplify interfacing to
optical printer hardware, e.g. buckle/viewer switches, home sensors, solid
state AC relays, trip switches, etc.
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Description
The PIO-100 board interfaces hardware on the optical printer to the parallel port
on the DOS machine running the OPCS software. It uses optical isolation to level
convert the IBM PC's 5 volt signals to stronger 12 volt signals on RJ-45 connectors,
so that regular RJ-45 ethernet patch cables can be used for cable runs to the
individual hardware devices, such as:
- Optical home sensors for film movements, filter wheel, lens board, zoom/focus, etc. (home)
- Buckle/Viewer sensing switches (buckle, viewer)
- Limit switches to detect overrun (tripswitch)
- Tension motor controls (tension)
- Stepper motor deenergizing (load, unlock, etc)
Board Layout
Schematic + Wiring Diagram
Home Sensors
Optical "home sensors" are used for the software to find the 'home position'
of all the motors. Each motor should have a home position:
- Camera film movement should 'home' to the fully closed position.
- Projector film movements should 'home' to the fully seated position.
- Fader (if any) should home to the fully closed position
- Zoom and lens board (if any) should home to the 1:1 position
- Filter wheel (if any) should home to the 'open filter' position (no filter)
- North/South, East/West should home to the fully centered position
Home sensors are highly recommended on all shutter axis
(camera, projectors, fader), and are advisable but not mandatory
for translation axes (North/South, East/West, Zoom), as they can
be jogged to position and left deenergized and locked when not in use.
See Configuring A Home Sensor
for details on how to set up a new home sensor for use with OPCS.
