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Originally Posted by Bremma
OK, so will I need to ground all of my switches on 4 and 12? Or do I just need to connect the ends of the switches to the pins?
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In looking at section 4 of the OI manual...
"Digital Inputs (see pinouts on pages 7-10)
To utilize these inputs, wire buttons or switches between the desired digital input signal pin and any ground pin. A digital input senses a connection to ground to become active. Do not connect switches or digital inputs to 5V. Do not use lighted switches."
Any switch will have one side wired to the desired digital input on one of the four ports and the other side of the switch will be wired to either/both pin 4 and/or 12 on any port. If you search you will find a reference that allows you to construct a "y" cable that will connecto two of the ports so that you can have a button box that has more switches than one port can provide. Also note that digital inputs are duplicated on two ports. See port 2 & port 4 pinout tables.