NSW-1 NMEA Autoswitch
The NSW-1 is no longer in production. Please see the NDC-4 which can be used as an Autoswitch.
The Actisense NMEA Autoswitch (NSW-1) from Active Research, allows the data from up to four NMEA (National Marine Electronics Association) input devices to be switched to a single NMEA output, by determining the highest priority device with good data.
The Actisense NMEA Autoswitch (NSW-1) from Active Research, allows the data from up to four NMEA (National Marine Electronics Association) input devices to be switched to a single NMEA output, by determining the highest priority device with good data.

Replace your mechanical changeover switch with the NSW-1 automatic changeover system from Actisense. The intelligent Autoswitch (NSW-1) will guarantee that the best input device is always selected to supply the NMEA data output, automatically choosing the next highest if the current highest priority input device should fail for any reason.

The NSW-1 Autoswitch contains intelligent software that determines the highest priority device based on one of three reasons:

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.
Geek Mode
  • A complete failure to send any NMEA data
  • Corrupted NMEA data detected (with checksum calculation)
  • If the validity flag(s) contained within the NMEA data indicate that this data is not valid and should only be used with caution

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
General        
Ambient temperature   -20 +70

°C

NSW-1 NMEA Autoswitch
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"With a staff of some of the sharpest engineering minds in the industry and a relentless drive to innovate, Actisense has achieved a standard of quality and reliability most companies only hope for. Their innovative designs and top-quality manufacturing result in a broad range of solutions infused with durability and value. We are proud to share in their success and without hesitation, recommend Actisense solutions to all of our customers."
Peter Braffitt, General Manager, GEMECO Marine Accessories
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