NDC-3 NMEA Multiplexer
This version of the NDC is no longer in production, please view the NDC-4 product if you require a new Multiplexer.

The Actisense NMEA Multiplexer / Combiner allows connection of up to four NMEA (National Marine Electronics Association) inputs to be multiplexed/combined in to one NMEA output.
The Actisense NMEA Multiplexer / Combiner allows connection of up to four NMEA (National Marine Electronics Association) inputs to be multiplexed/combined in to one NMEA output.

This approach offers these major advantages

The NDC-3 has an NMEA 0183 output and a bi-directional RS232 port.

The NDC-3-USB has an additional USB bi-directional port (which when connected disables the RS232 input, but leaves the RS232 output freely available for use).

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-3 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.
Geek Mode
  • It enables the vessel owner complete access to all NMEA data sources, instead of the standard one device
  • 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

Technical Specification

Supply voltage   8 35 V
Supply current Supply voltage 12v (no load) 26 30 mA
  Supply voltage 24v (no load) 16 18 mA
NMEA in/out        
Input voltage tolerance

Continuous operation

Short Term Operation (<1 sec)

-15

-35

+15

+35

V

V

Differential input voltage Required level for data to be detected 1.8 - V
Output current RS485/RS422 compatible - 32 mA
Input to output protection Full Galvanic Opto-isolation protection - 2000 V
Baud rate Fixed Baud rate - 4800 bps
Data propagation delay   1 100 msec
RS232 in/out        
Input voltage tolerance   -15 +15 V
Input voltage threshold

Logical LOW

Logical HIGH

0.8

1.7

1.2

2.8

V

V

Output resistance Output voltage swing +/-2V 300 - ohms
Baud rate Configurable Baud rate 4800 115200 bps
Data propagation delay   1 100 msec
USB Interface (NDC-3-USB only)      
Interface version USB v1.1 (fully compatible with USB v2.0)      
General        
Ambient temperature   -20 +70

°C

NDC-3 NMEA Multiplexer
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Testimonial
"We have been working with Actisense for more than 9 years now. Our sales in terms of units raise to a 4 digit figure. As far as I can remember, we have returned just one NMEA Buffer back to the manufacturer under warranty. That says it all."
Alberto Olmos, Sales Director, Aage Hempel Crame
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