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NION and CAB products include a versatile GPIO (General Purpose Input Output) system at the rear for terminating external logic, controls, relays and other external systems. This port is used when you want to connect a rotary encoder device to the NION. Up to eight rotary encoders can be connected to a single NION. They are supported by all variants of the NION.
Connect the rotary encoder to the GPIO port on the rear of the NION using three pins. Several GPIO pins perform the same function, so you can choose from a number of pins for each.
NION GPIO pin |
Rotary encoder pin |
10, 11, 22, or 23 |
Common |
2, 4, 6, 8, 14, 16, 18, or 20 |
2nd pin |
3, 5, 7, 9, 15, 17, 19, or 21 |
3rd pin |
Note: The rotary encoder may also have connections for a push button, as well as a rotary mechanism. You must use the pins associated with the rotary mechanism only.
When you are designing your project and you add a NION to your NWare design, select the following functions for the GPIO pins:
For information on the GPIO controls for the NION device in NWare, see GPIO in the NWare Device Reference.
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