Regular price $771.08 $0.00

NMEA 0183 Multiplexer

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The configuration tool is accessible via any popular web browser using the Ethernet port, which supports both direct and network connections. Industry leading isolation is provided on all inputs and outputs as standard so that connected devices safely avoid hazardous ground loops, the number one cause of product failure in NMEA 0183 networks. This makes the NDC-5 robust enough to handle any NMEA 0183 installation.

Pluggable connectors allow new devices to be easily installed without the need to remove the NDC-5 from its mounted location. An optional professional DIN rail mounting mechanism keeps the NDC-5 secure in high vibration environments. Integrated LEDs provide feedback on basic status while advanced statistics are available via a Web Browser.


  • 5 OPTO-Isolated NMEA 0183 inputs
  • 2 ISO-Drive NMEA 0183 outputs
  • Dedicated bi-directional Serial port (fully isolated utising ISO-Drive technology)
  • Serial port can be used as additional input / output
  • Ethernet port supports direct and network connection
  • Configurable input and output baud rates
  • Allows Data combining and rate conversion
  • 2 independent Auto-switch virtual inputs with priority
  • Isolation to battery supply
  • Diagnostic LEDs
  • IP65 rated Polycarbonate housing
  • Optional DIN rail mount


  • Quick and easy to install
  • Configuration using standard web browser, no PC operating system compatibility issues
  • Advanced features solve NMEA 0183 data routing problems
  • Fully isolated with ISO-Drive technology for peace of mind
  • Easy firmware updates make the device future-proof
Power Supply
Input supply voltage9 to 35 V DC
Input supply current110mA max @ 12V DC (all outputs @ full drive into 100 ohm loads)
Input protectionContinuous reverse polarity, transient overvoltage and ESD protection
Power indicatorLED, Blue – indicates unit is functioning correctly


NMEA 0183 Port – Listener & Talker
Number of Listener / input ports5 isolated NMEA 0183 Listeners
Number of Talker / output ports2 isolated NMEA 0183 Talkers
CompatibilityFully NMEA 0183, RS422 & RS232 compatible. RS485 Listener compatible
Electrical isolation2500 V input to ground, 1500 V output to ground using ISO-Drive™
Speed / baud rateIn1 to In4: up to 38400 bps In5: 4800 bps Out1: up to 115200 bps Out2: up to 38400 bps
Talker output voltage drive>= 2.1V (differential) into 100 ohm
Talker output current drive20 mA maximum per output
Talker output protectionShort circuit and ESD
Listener input voltage tolerance-15 V to +15 V continuous, -35 V to +35 V short term (< 1 second)
Listener input protectionCurrent limited, overdrive protection to 40 VDC and ESD protection
Listener data indicatorLED, Green (Flashes to indicate valid input)
Status indicatorLED, Green / Yellow / Red to indicate status (see user manual)


Serial Port
Number of input ports1 isolated input
Number of output ports1 isolated output
CompatibilityRS422 & RS232 compatible. RS485 Listener compatible
Electrical isolation2500 V input to ground 1500 V output to ground using ISO-Drive™
Speed / baud rate115200 bps
Output voltage drive>= 2.1V (differential) into 100 ohm
Output current drive20 mA max.
Output protectionShort circuit and ESD
Input voltage tolerance-15 V to +15 V continuous, -35 V to +35 V short term (< 1 second)
Input protectionCurrent limited, overdrive protection to 40 VDC and ESD protection
Ethernet Port
Host interface10/100BaseT, automatic polarity detection
Supported protocolsTCP/IP for configuration and firmware updating
TCP/IP and UDP for NMEA 0183 comms
Electrical isolation2kV
IndicatorsGreen – Link, Yellow – 100 Mbps

Mode Inputs

Input voltage range0 to 35V DC
ProtectionTransient overvoltage and ESD protection


Alarm Output

ContactsNormally open and normally closed*
Electrical isolation1000V between power supply and contacts
Alarm indicatorLED, red indicates a valid alarm condition


Housing materialPolycarbonate
Protective Lid MaterialPolycarbonate
Sealing MaterialExpanded silicone foam gasket, closed cell polyurethane splash guard and ePTFE waterproof vent
Dimensions127mm (L) x 106mm (W) x 48mm (H)
Weight230g including screw terminals and RJ45 cap
Mounting4 x 3.5mm lugs to allow panel mount with self tapping screws (included), optional DIN rail mount available on request.
Compass safe distanceTBD
Wiring terminalsPluggable 2/3 way screw terminal, 3.5mm pitch, 14 to 30 AWG


Approvals and Certifications
EMCIEC 60945 (sections 9 & 10)
Environmental protectionIP65
Operating temperature-15°C to +55°C
Storage temperature-40°C to +85°C
Relative Humidity (RH)0 – 80% RH


3 years

NDC-4 Vs NDC-5

Feature                                                                                                 NDC-4                                                   NDC-5

Inputs (inc. serial port)                                                                 5                                                              6

Outputs (inc. serial port)                                                              2                                                              3

Dedicated serial port                                                                     –                                                             Yes

Ethernet port                                                                                   –                                                             Yes

Config tool                                                                                                  Windows only                                 Any popular web browser on any OS

Basic data filtering                                                                          Yes                                                         Yes

Advanced data routing                                                                   –                                                             Yes

Safe USB connection while powered via a battery                   –                                                             Yes

Pluggable connectors (quicker and easier installation)           –                                                             Yes

Weather sealed                                                                               IP66                                                       IP66

Data Sheet



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