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Home > Electronics > Actisense NMEA2000 Network >
Actisense NMEA Autoswitch, NDC-4-ASW

Actisense NMEA Autoswitch, NDC-4-ASW




Availability: Usually ships the next business day

Brand New with Factory Warranty

Actisense NMEA Autoswitch, NDC-4-ASW
ndc-4-aswList Price: $US 390.90Our Price: $US 338.78

The Actisense NDC-4 and NDC-4-USB allow up to five OPTO isolated NMEA 0183 sources to be multiplexed into a single stream*.

Two flexible ISO-Drive outputs allow two different downstream talker baud rates to be created, ensuring maximum system flexibility.

The NDC-4 is flexible and powerful enough to be the heart of a simple system, or one of many Actisense products in a more complex system. It provides complete access to all NMEA 0183 data sources, configurable filters to remove unwanted data, as well as enabling an on-board PC to read and add the combined data stream.

Factory preconfigured versions enable the NDC-4 to be used out of the box for AIS operation (NDC-4-AIS) or as an Autoswitch (NDC-4-ASW).

*Four inputs on the USB version, as the USB interface acts as the fifth channel, overriding the fifth OPTO input.

Benefits of the NDC-4 versions:

  • Multiplex up to five NMEA 0183 devices
  • Filter unwanted data
  • Five flexible versions available (NDC-4, NDC-4-USB, NDC-4-ASW, NDC-4-AIS & NDC-4-AIS-USB)
  • Preconfigured versions for AIS and Autoswitch operation
  • USB kit (NDC-4-USBKIT) converts an NDC-4 to an NDC-4-USB  

5 OPTO-Isolated NMEA 0183 Data Inputs

Full galvanic Opto-isolated differential inputs that fully comply with the NMEA 0183 standard specification. This allows the input to work correctly with long cable runs, and/or in a noisy environment.

This also allows the NDC-4 to offer up to 2500v of common mode voltage difference (between its input and outputs). This will prevent any ground loop damage occurring.

Inputs 0-3 have independently selectable baud rates of 4800 to 57600 baud; Input 4 is fixed at 4800 baud.

(When the USB connection is in use, the number of NMEA opto inputs is reduced to 4).

2 ISO-Drive Flexible Outputs

The ISO-Drive outputs are fully compatible with the RS422 (NMEA 0183), RS485 and RS232 connections on the NMEA listening device(s) the NDC-4 supplies data to, and offers total galvanic isolation of up to 1500v between the output and ground.

The full-differential output ensures better quality communications and lower noise emissions on unshielded twisted pair cabling.

Outputs 0 & 1 have independently selectable baud rates of 4800 to 115200 baud.

NMEA and PC (USB/ISO-Drive) Outputs

Allows any NMEA device and PC to read the combined NMEA data output. Furthermore, special NMEA codes are used to label each NMEA sentence - allowing the NMEA device or PC to determine where all the NMEA information originated from.

Powerful Processor

An ARM 32-bit microcontroller capable of 40 million instructions per second, and very large NMEA data buffers to allow smoothing of short-term peaks in the NMEA data flow.

Flash Upgradeable

The hardware's firmware (software) can be easily upgraded as and when necessary.

 

Combine Mode: Intelligent Software

Filters the valid data from all active inputs, using the configured Inclusion lists, and then combines the remaining data using a simple priority system. Highest priority input (1) has the best chance of its data being added to the output combined NMEA data, and input 4 the lowest chance. This advanced user controlled system only operates as and when it becomes necessary to reduce the NMEA data outputted (triggered by very high loading of the combined NMEA output).

The ISO-Drive and / or USB output will always contain all of the NMEA data (due to its higher Baud rate and bandwidth).

Autoswitch Mode: Intelligent Software

Determines the highest priority device with valid data, based on one of three reasons - a failure to send any NMEA data, an invalid NMEA sentence checksum, or if the validity flag(s) contained within the NMEA sentence indicate that this data is not valid and should only be used with caution (for GPS and Depth data).

The chosen input's data will be resent out the two ISO-Drive outputs (and USB if available), allowing two different Baud rates to be used (typically 38400 Baud and 4800 Baud).

Very Low Current Consumption

Ideal for small vessels with small batteries.

Diagnostic Tri-Colour LED

Indicates current operation mode, volume of data being multiplexed, or if a hardware fault has been detected.

IP66/IP68 Case and Gland Design

A very robust polycarbonate case with a high waterproof certification. The small case size is ideal for space restrictive applications.

High Quality Angled Screw Terminals

The 'moving cage' type terminals make cable installation a simple and quick operation.

 

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

V

V

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)      
General        
Ambient temperature   -20 +70 C
Guarantee Actisense guarantee   -  3 Years 
Gland clamping range Cable diameters accommodated 4.5 10 mm

NDC-4 Datasheet issue 2.00.pdf 782KB

Release Date: 01/11/2016

The datasheet provides an overview of the NDC-4 features and abilities.

 
 

NDC-4 -A Full User Manual Issue 1.09.pdf 2.98MB

Release Date: 16/12/2015

The manual details everything you need to know about the NDC-4 & NDC-4-USB.








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