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NBF-3 NMEA Buffer
Safely drive up to six NMEA 0183 Listeners, with power distribution for the connected Talker.
The Actisense NMEA 0183 Buffer isolates and buffers NMEA 0183 data, with the power to drive multiple devices.
Ground breaking ISO-Drive technology from Actisense means you can safely connect to 6 NMEA 0183 Listeners to the NBF-3 with complete peace of mind that your devices are safe from hazardous ground loops. The OPTO-isolated input also protects the connected Talker.

The NBF-3 can distribute up to six identical, amplified streams of data from one source. The NMEA signals are buffered to ensure that each Listener receives the data at the required voltage levels, providing consistent data quality.

The NBF-3 has the addition of power distribution for the NMEA Talker. By having power and data from the same source, cabling requirements are reduced and installation is simple.
Geek Mode
  • One OPTO-isolated input and Six ISO-Drive™ outputs for safe connections
  • Compatible with all NMEA 0183 devices
  • Pluggable screw terminals and DIN Rail mount provide quick and easy installation
  • Power and input indicator LEDs to aid network diagnosis
  • Power feed for single cable installations to the NMEA Talker helps reduce cabling requirements


Technical Specification

Power Supply
Input Supply Voltage 10 to 35V DC
Input Supply Current (NBF-3 only) 100mA max @ 12V DC (all outputs @ full drive into 100Ω loads)
Input Supply Connector Pluggable 2 way screw terminal, 3.5mm pitch
Input Protection (NBF-3 only) Continuous reverse polarity and ESD protection
Power Indicator LED, blue (lit constantly indicates correct operation when input supply connected)
Listener Power Output Voltage 10 to 35V DC derived directly from the input supply voltage
Listener Power Output Current 500mA max @ <= 30°C (see note)* (PTC self-resettable fuse)
Listener Power Output Connector Pluggable 2 way screw terminal, 3.5mm pitch
NMEA 0183 Port - Listener & Talkers
Number of Listener / Input Ports One isolated NMEA 0183 Listener
Number of Talker / Output Ports Six isolated NMEA 0183 Talkers
Compatibility Fully NMEA 0183, RS422 & RS232 compatible. RS485 Listener compatible
Galvanic Isolation 2500V input to ground 1500V output to ground using ISO-Drive
Speed / Baud Rate 4800 to 115200 bps
Talker Output Voltage Drive >= 2.1V (differential) into 100Ω
Talker Output Current Drive 20mA max.
Talker Output Protection Short circuit and ESD
Listener Input Voltage Tolerance -15V to +15V continuous, -35V to +35V short term (<1 second)
Listener Input Protection Current limited, overdrive protection to 40V DC and ESD protection
Listener Data Indicator LED, green (flashes at data rate)
Connectors Pluggable 2-way screw terminals, 3.5mm pitch
Approvals and Certifications
EMC EN 60945 (sections 9 & 10)
Environmental Protection IP66
Operating Temperature -20°C to +70°C
Storage Temperature -40°C to +85°C
Housing Material Polycarbonate
Protective Lid Material Polycarbonate
Sealing Materials Expanded silicone foam gasket, closed cell polyurethane splash guard and ePTFE waterproof vent
Dimensions 127mm (L) x 106mm (W) x 48mm (H)
Weight 210g
Mounting 4 x 3.5mm lugs to allow panel mount with self tapping screws (included), optional DIN rail mount available on request.
NBF-3 NMEA Buffer
Where to buy
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"I have installed our first EMU-1 on Honda BF-90 outboard and I'm very pleased with ease of configuration. I have even produced short YouTube promo clip to present the new product in our portfolio."
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