
Page 2 PNET Opto-Input – Quick Start Guide
1 Quick Start
The PNET Opto-Input board is a versatile way to bring Optically-Isolated Event
Sources into the PNET World. This manual will get you going as quick as
possible. Here are the basic steps to using your new PNET board.
1. Unpack the PNET OptoInput.
2. Connect the Optional External Power Input.
3. Connect the Input Trigger Sources.
4. Set the DIP Switches.
5. Connect the PNET cable.
6. Test your new Trigger Input source.
2 Power Input (Optional)
Figure 1 - Power Connection
The PNET Opto-Input board does not require external power input, it can
simply obtain it’s power from the PNET. If you have a situation where you need
to have external power, simply connect an external DC power input. Typically a
wall transformer, or wall-wart is used, but any suitable power supply can be
used. Any DC voltage from 9V to 12V can be used, but 12V is typical. If this
optional external power source is used, it is blocked from entering the PNET
bus. If your desired power-supply comes with a connector on the end, simply
clip it off, and strip it as shown above. Secure the stripped wire ends to the 2
terminals of the Power Input terminal strip. Terminal-1 is the GND, and
Terminal-2 is the positive. A protection diode prevents any damage due to
reversed polarity.
3 Connecting Trigger Input Sources
The Trigger Inputs are Optically Isolated which means you can wire an external
device as a trigger input for your PNET, but maintain a completely isolated
system. As a convenience to your wiring, you may use the power supplied on
the Trigger Input Terminal Strip, but doing so will defeat the isolation offered
by the Opto-Isolators. If you are simply wiring switches or buttons, there isn’t
much chance of a ‘ground loop’ or ‘noise’, so we give you the best of both
worlds. See the complete User Manual or our web site for examples of