NBF -3

NBF -3

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Actisense NMEA 0183 Buffer

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The NBF-3 NMEA Buffer isolates and buffers NMEA 0183 data, with the power to drive multiple devices. Able to 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.


  • One OPTO-isolated input Six ISO-DriveTM outputs
  • Compatible with RS422, RS232 and RS485 connections
  • Pluggable screw terminals
  • Power and input indicator LEDs
  • Power feed (500 mA) for single cable installations to the NMEA Talker
  • Optional DIN rail mount Up to 115200 baud
  • Outputs automatically track the input baud rate
  • Protocol independent


  • AIS compatible
  • Protects connected devices
  • Simple installation
Power Supply
Input Supply Voltage10 to 35V DC
Input Supply Current (NBF-3 only)100mA max @ 12V DC (all outputs @ full drive into 100Ω loads)
Input Supply ConnectorPluggable 2 way screw terminal, 3.5mm pitch
Input Protection (NBF-3 only)Continuous reverse polarity and ESD protection
Power IndicatorLED, blue (lit constantly indicates correct operation when input supply connected)
Listener Power Output Voltage10 to 35V DC derived directly from the input supply voltage
Listener Power Output Current500mA 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 PortsOne isolated NMEA 0183 Listener
Number of Talker / Output PortsSix isolated NMEA 0183 Talkers
CompatibilityFully NMEA 0183, RS422 & RS232 compatible. RS485 Listener compatible
Galvanic Isolation2500V input to ground 1500V output to ground using ISO-Drive
Speed / Baud Rate4800 to 115200 bps
Talker Output Voltage Drive>= 2.1V (differential) into 100Ω
Talker Output Current Drive20mA max.
Talker Output ProtectionShort circuit and ESD
Listener Input Voltage Tolerance-15V to +15V continuous, -35V to +35V short term (<1 second)
Listener Input ProtectionCurrent limited, overdrive protection to 40V DC and ESD protection
Listener Data IndicatorLED, green (flashes at data rate)


Pluggable 2-way screw terminals, 3.5mm pitch


Approvals and Certifications
EMCEN 60945 (sections 9 & 10)
Environmental ProtectionIP66
Operating Temperature-20°C to +70°C
Storage Temperature


-40°C to +85°C


Housing MaterialPolycarbonate
Protective Lid MaterialPolycarbonate
Sealing MaterialsExpanded silicone foam gasket, closed cell polyurethane splash guard and ePTFE waterproof vent
Dimensions127mm (L) x 106mm (W) x 48mm (H)
Mounting4 x 3.5mm lugs to allow panel mount with self tapping screws (included), optional DIN rail mount available on request.


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