17. Digital Inputs

Cerbo GX Manual

17. Digital Inputs

In this section:

The Cerbo GX digital inputs are shown in the Overview of connections.

Electrical characteristics

Inputs are non-isolated
Operate at 3.3 V logic level
Each input includes an internal 10 kΩ pull-up resistor to 3.3 V
Can safely withstand input voltages up to 5 V

For reliable operation, we recommend connecting the inputs to a potential-free switch or relay contact, open-collector, or optocoupler output.

17.1. Configuration

Each digital input can be configured as one of several predefined sensor types, with the option to set them up as alarms.

Note: The Pulse Meter function is not supported on the first-generation Cerbo GX (PN BPP900450100). It is supported on second-generation models: PN BPP900450110 and BPP900451100.

The possible configurable functions are:

Function	States
Pulse meter	N/A
Door alarm	Open/Closed
Bilge pump	On/Off
Bilge alarm	Ok/Alarm
Burglar alarm	Ok/Alarm
Smoke alarm	Ok/Alarm
Fire alarm	Ok/Alarm
CO2 alarm	Ok/Alarm
Generator	Running/Stopped

The function of each input can be configured in the Remote Console under Settings → I/O → Digital Inputs.

Once the input is configured for its intended purpose, it will show up in the Device list.

Other parameters related to that function can be configured by entering the device menu from the Device list and selecting Setup.

For sensors and alarms, you can decide whether the input should be treated as an alarm condition, whether the labels should be inverted, and whether the logical levels should be inverted.

To swap the labels attached to the alarm, set Inverted to on.
If a logical low input (0V) should be considered a positive condition, set Inverted alarm logic to on.

For GX devices whose digital inputs can be used as pulse meters (Cerbo GX MKII, Ekrano GX and Venus GX), you can configure the unit and multiplier (representing the volume per pulse) and reset the counter as needed.