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Switched outputs

The UCC MMI has the following uncommitted switched output.

Pin 6 is the uncommitted output available on the UCC MMI I/O connector. The UCC MMI does not directly control the operation of this output, as it is controlled from the application software package via ‘command 318, Write to controller port'.

The output is pulled up to the 24 V rail by a 20 kΩ resistor when inactive, and will be pulled down to the 24 V return line via an NPN transistor when activated. There is an excess voltage protective diode fitted internally to the controller. This output is suitable for driving inputs in the range 5 V to 24 V.

If the output is not connected to the installation then it should be left open circuit.