RIO-8 I/Os

Terminal Strip Connections

RIO-8 modules connect to power and user signals via two green, screw-terminal connectors. Each pin on these connectors is labelled on the connector's front face:

V+

positive DC power for the RIO device; Both pins are tied together internally.

GND

ground; Negative DC power for the RIO device and electrical reference point for all inputs and outputs. All ground pins are tied together internally.

DI-1, DI-2, DI-3, DI-4

optically-isolated digital inputs; These inputs are pulled high internally, and suitable for connecting to most Form A or TTL outputs.

DO-1, DO-1C, DO-2, DO-2C, DO-3, DO-3C, DO-4, DO-4C

digital outputs; Each pair of outputs (ex: DO-1 and DO-1C) are connected while the associated output LED is lit.

Digital Inputs

Digital inputs should be driven to ground to signal "on".

Use a Debounce value of 75 for mechanical inputs and a Debounce value of 0 for digital inputs.

Digital Outputs

RIO-8 outputs are driven with a very low impedance, mechanical switch.

RIO-8 outputs float independently from system ground.