Actisense NDC-4-AIS-USB NMEA0183 Multiplexer

Multiplex or Autoswitch up to 4 NMEA0183 devices to your PC, Chart-plotter, Radar, Autopilot, AIS and more, with NMEA 0183 HS compatibility and ISO-Drive

The NDC-4-AIS-USB model is one of five NDC-4 versions available from Actisense.

The Actisense NDC-4-AIS-USB model version is pre-configured for AIS and USB connection and is a next-generation NMEA Combiner / Multiplexer that has full isolation on all inputs and all outputs.

Using the ISO-Drive Actisense technology, ground loops are now a thing of the past.

Can Combine or Autoswitch up to 4 NMEA0183 devices, plus filter out any problematic or unwanted NMEA sentences.

Full galvanic Opto-isolation on NMEA 0183 inputs
Full galvanic isolation on NMEA 0183 / ISO-Drive outputs
Configurable Port Baud rates and priorities

This Actisense NDC-4-AIS-USB NMEA Multiplexer / Combiner allows connection of up to four NMEA0183 (National Marine Electronics Association) inputs, and multiplexes/combines or auto switches them to its two fully isolated NMEA outputs. This approach offers these major advantages:

Completely removes the need for isolated power supplies - as the NDC-4 creates a full 2500v isolation barrier between its inputs and each of its ISO-Drive outputs
Enables the vessel owner complete access to all NMEA data sources, instead of the standard one device
Any problematic or unwanted NMEA sentences can be filtered out / blocked, to help intelligently reduce the NMEA data to a manageable amount and prevent data loops
Each NMEA input device is Opto-isolated from all other NMEA devices in the system
Significant reductions in installation cost (from reduced cable lengths and requiring only one NMEA cable to be routed around the bridge to supply the multiplexed NMEA data)

The NDC-4 has two ISO-Drive outputs which are fully compatible with all standards: NMEA 0183 (RS422), RS485 and PC RS232 ports.

An NDC-4-USB model has an additional USB bi-directional port that allows a copy of the data on the second ISO-Drive output to be sent to a virtual serial port on a PC, while also receiving data (waypoint data for example) from the PC through the same virtual port. This option disables the Opto input reserved for the PC connection, reducing the number of inputs the NDC-4-USB has to 4, versus 5 inputs on the other versions.

New feature: The auto-switching feature of the NSW-1 has now been added to the NDC-4, making it the single most feature-rich Multiplexer available in the marine market. The NDC-4 can either operate in 'Combine mode' as before or the new 'Autoswitch mode' to behave like the original Actisense NSW-1 Autoswitch product.

Electrical spike protection is provided as standard on all four input channels using optoisolators. This protects any connected equipment from most system faults; a particularly valuable benefit as equipment requiring the most data, such as a PC or chart plotter, is often the most expensive to repair or replace.

The NDC-4 Data Multiplexer contains intelligent software that manages the multiplexing operation, allowing every input to have a chance of its data reaching the combined NMEA output. Tested up to and beyond a combined 400% loading of the four inputs.

NDC-4-AIS-USB Full User Manual Issue 1 06

NDC-4-A Datasheet

Actisense Product Matrix

NDC-4: Specifications

All Versions

Parameter

Description

Min.

Max.

Unit

Supply voltage

Supply current

Supply voltage 12v (no load) - 360mWatts

Supply voltage 24v (no load)

Opto-isolated in

Input voltage tolerance

Continuous operation

Short term operation (<1 sec)

-15-35

+15+35

Differential input voltage

Required level for data to be detected

1.8

Input current

Input to ground

Full Galvanic Opto-isloation protection

2500

Baud rate

In 0-3: Independant configurable baud rates

4800

57600

bps

Data propagation delay

Time taken from input to output

100

msec

ISO-Drive out

NMEA 0183 version 1-3 & PC Serial

Output current

RS485/RS422/RS232 compatible

Diferential output voltage

100 ohm load

2.1

Output to ground

Full Galvanic isolation protection

1500

Output to output

Full Galvanic isolation protection

1500

Baud rate

Out 0-1; Independant configurable baud rates

4800

115200

bps

USB interface

NDC-4-USB only

Interface version

USB v1.1 (fully compatible with USB v2.0)

General

Ambient temperature

-20

+70

°C

Guarantee

Actisense guarantee

Years

Gland clamping range

Cable diameters accommodated

4.5

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