This driver allows monitoring a Form-C (SPDT) contact, or two SPST (Form-A/B) contacts using a single ezeio input.

Using a few resistors, the driver can monitor each contact state individually, and also indicate if there is a wiring fault (short or open), all with just a single input. Note that the resistors shall be located physically as close to he monitored contact as possible to achieve the desired security function.

The driver settings allow for choosing between common resistor values.

If a destination list is selected, an alert will be sent. If no destination list is selected, the alert is only logged.

A holdoff setting allows for a delay before the alert is generated.

The restore holdoff prevents new alerts to be sent for a given time.

Note that wiring fault events are not affected by the holdoff timers, but will be immediately sent.