Mastervolt 77030900 Digital Input Interface

Configurable Settings: Language, Device Name, Option for 1 second pulse, Min/Max runtime options and time configuration
Relay Modes: Stand By or Activate
Stand by: Input 1 is connected to Output 2 (normally closed)
Activate: Input 1 is connected to 3 Output 3 (normally open)


Maximum relay current: 1A
Potential free contact: NO-C-NC – 1 A / 30 V DC
Pins(left to right): input, normally closed, normally open
Ingress Protection: IP 21
Comes With: Screw terminal, MasterBus cable, MasterBus Terminator, User manual
Power consumption: 132 mW
MasterBus Powering: No

Mounting hole diameter: 4.5mm / 0.18 inch
Din rail mounting: Yes, Din rail 30 mm / 1.2 inch
# of Fasteners: 2

Requires event programming in Masteradjust.

MasterAdjust's events programming language can be a bit confusing, so here is how we like to translate:

Source: What signal from the source device will trigger the event?
Target: What device in the network do you want to be affected because of the source?
Command: What possible command in the target device do you want to affect
Copy= Execute (Do this)
Copy Invert = Do the opposite of this, if currently on this state/function

Requires Mastervolt & CZone USB Interface Programming Tool to program

The Digital Input is one of the easiest ways to integrate traditional switches into a modern MasterBus system. Instead of running heavy power wiring to every switch, you can use simple low-current switches to send commands through the MasterBus network and let the system handle the actual loads.

This is especially useful for lighting circuits, pumps, or other accessories that are controlled through Mastervolt digital switching. A standard on/off or momentary switch can be wired to the Digital Input, and that signal can trigger a relay, dimmer, or any other MasterBus-controlled device. It keeps wiring cleaner, reduces voltage drop, and makes future system changes much easier.

The Digital Input is also ideal for adding extra control points around a vessel or vehicle. For example, you can install a small switch near a bunk to control cabin lights, or a switch at the transom to activate deck lighting, all without running new high-current wiring back to the distribution panel.

Another common use is integrating third-party switches or panels into a MasterBus system. If you already have existing rocker switches or push buttons, the Digital Input allows you to keep them while still gaining the benefits of MasterBus automation and monitoring.

In short, the Digital Input gives you a simple, low-cost way to expand control options, reuse existing switches, and create a cleaner, more flexible electrical system