Actisense NDC-4 NMEA Multiplexer

Flexible multiplexing with preconfigured versions for Autoswitching or AIS operation.

The Actisense NDC-4 NMEA Multiplexers 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.

The Actisense NDC-4 and NDC-4-USB allow up to five OPTO isolated NMEA 0183 sources to be multiplexed into a single 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). Two flexible ISO-Drive outputs allow two different downstream talker baud rates to be created, ensuring maximum system flexibility.

Actisense NDC-4 NMEA Multiplexers Features:

• 5 OPTO-Isolated NMEA 0183 Data Inputs allowing the input to work correctly with long cable runs, and/or in a noisy environment
  
• 2 ISO-Drive Flexible Outputs 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
  
• NMEA and PC (USB/ISO-Drive) Outputs
  
• Powerful Processor - the ARM 32-bit microcontroller is capable of 40 million instructions per second, with very large NMEA data buffers to allow smoothing of short-term peaks in the NMEA data flow
  
• Flash Upgradeable
  
• 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
  
• Autoswitch Mode: Intelligent Software determines the highest priority device with valid data
  
• Very Low Current Consumption - ideal for small vessels with small batteries.
  
• Diagnostic Tri-Colour LED that 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
  
• High Quality Angled Screw Terminals that make cable installation a simple and quick operation

Actisense NDC-4 NMEA Multiplexers Specifications:

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 and 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	degreesC
Guarantee	Actisense guarantee	-	3	Years
Gland clamping range	Cable diameters accommodated	4.5	10	mm