16. Digital Inputs
The Cerbo GX digital inputs are shown in the Overview of connections.
The inputs are non-isolated. They operate at 3V3 levels, and can withstand up to 5V input. Each input has an internal 10k pull-up resistor to 3V3. We recommend wiring it to a potential free relay or otherwise open collector/optocoupler output.
16.1. Configuration
Each of the digital inputs can be configured as one of a number of predefined sensors that can also be configured as alarms.
Note: The Pulse Meter is not supported in the first-generation Cerbo GX (PN BPP900450100). However, it is supported in the second-generation Cerbo GX 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 with other devices.
Other parameters related to that function can be configured by entering the device menu 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.
16.2. Read-out of digital inputs via Modbus TCP
The values/states of the digital inputs are available on Modbus TCP. For more details about this, please download a copy of the document “Modbus-TCP register list” from our website. And see our Modbus-TCP FAQ in the GX Modbus-TCP Manual.