Actisense NDC-4-AIS-USB NMEA0183 Multiplexer #:  31052
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Actisense NDC-4-AIS-USB NMEA0183 Multiplexer

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Next generation NMEA0183 Combiner / Multiplexer pre configured for AIS and USB, featuring full isolation on all inputs and up to four outputs.
More Details...   #31052
Brand:  Actisense
MFG Part#:   NDC-4-AIS-USB
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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 autoswitches 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 it's inputs and each of it's 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 device 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. 
A 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 autoswitching 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 opto-isolators. 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

NDC-4: Specifications

All Versions
Parameter Description Min. Max. Unit
Supply voltage   10 35 V
Supply current Supply voltage 12v (no load) - 360mWatts 32 34 mA
  Supply voltage 24v (no load) 17 18 mA
Opto-isolated in        
Input voltage tolerance Continuous operation

Short term operation (<1 sec)
-15-35 +15+35 VV
Differential input voltage Required level for data to be detected 1.8 - V
Input current   - 2 mA
Input to ground Full Galvanic Opto-isloation protection - 2500 V
Baud rate In 0-3: Independant configurable baud rates  4800  57600  bps 
Data propagation delay Time taken from input to output 1 100 msec
ISO-Drive out NMEA 0183 version 1-3 & PC Serial      
Output current RS485/RS422/RS232 compatible - 22 mA
Diferential output voltage 100 ohm load 2.1 - V
Output to ground Full Galvanic isolation protection - 1500 V
Output to output Full Galvanic isolation protection - 1500 V
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)      
Ambient temperature   -20 +70 °C
Guarantee Actisense guarantee   -  3 Years 
Gland clamping range Cable diameters accommodated 4.5 10 mm

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A. We have free ground shipping via UPS or Canada Post within Canada on most orders of $99 or more (pre-tax).

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A. Some items are exempt from this offer and are indicated on the product page. Exempt items are usually bulky or heavy items such as buoys. Over 98% of the items on qualify for the free shipping offer.
To see what your shipping charge (if any) will be you can add the item(s) and quantities to the shopping cart and you will see a shipping cost calculator

Q. Where do you ship from?
A. We ship from Halifax, NS

Q. What is the delivery time?
A.  NS, NB, PE: 1 - 2 business days,
      ON, QC, NL: 2- 4 business days
      MB, SK, AB: 4-5 business days
      BC: 5-7 business days
When your order ships you will be emailed a tracking number which will give you the scheduled delivery date

Q. Do you offer Express Shipping?
A. Yes we can ship your order express. Please send an email and we will provide you with a quote (

Q. Do you require a signature on delivery?
A. We sometimes add a signature requirement especially if it is a high value package

Please Note:
Very Remote areas are exempt from Free Shipping offer. These are typically remote northern areas. Nunavut as well as many parts of the Yukon and NWT are exempt from free shipping

Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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