Overview

The Vimar VM01845.1 is a line coupler used to connect two By-me Plus bus lines while keeping the lines electrically separated. It works on a 29 V bus supply, draws 30 mA, and mounts on a DIN 60715 TH35 (EN 50022) rail, taking up 2 DIN modules (35 mm) in your electrical cabinet.

On a boat, this is typically installed in the main distribution panel or an automation cabinet when the bus layout needs two powered sections, or when two lines need to communicate without tying the wiring together directly. The unit must be powered from both sides, so each connected line should have its own bus power available.

Key features

• Couples two By-me Plus bus lines while maintaining electrical separation between the lines
• Rated supply voltage: 29 V bus; the device must be powered from both sides
• Current draw: 30 mA
• Dissipated power: 800 mW average, 1100 mW maximum
• DIN rail mounting on DIN 60715 TH35 (EN 50022); occupies 2 modules of 17.5 mm (35 mm total)
• Filters bus traffic so only relevant messages pass between lines, with a manual routing mode available
• Configured using the View Pro app; the Function button supports reset and manual routing functions

Compatibility and fit

This coupler is intended for Vimar By-me Plus bus installations that use a 29 V bus supply. It is not a KNX, KNX-RF, or LON coupler.

Because it is a DIN device, it belongs inside a protected electrical cabinet rather than in an exposed location. Plan space for a 2-module unit and leave room for clean cable routing and strain relief, especially in high-vibration installs.

Installation and setup

Clip the unit onto a TH35 DIN rail and wire each bus side to match your system topology. In marine panels, keep bus wiring organized and supported so vibration does not work connections loose over time.

Configuration is handled through the View Pro app. The Function button provides a reset procedure and a manual mode that routes all messages, with an automatic timeout after 2 hours.

Electrical and system integration

This is a low-voltage bus device, so treat its cabling and terminations like any other SELV circuit on board. In mixed-voltage cabinets, keep mains conductors (230 V AC) physically separated from SELV wiring to reduce noise pickup and to keep the panel serviceable.

Use cases on board

Common layouts include splitting an automation backbone between zones such as salon and cabins, or joining a secondary panel into the same By-me Plus system while keeping each side independently powered. It is a practical fit for refits where the bus is being extended into a new area of the vessel and you want clearer segmentation between lines.