Interface between PC and nautical instruments 

The Brookhouse standard NMEA Combiner / Multiplexer combines NMEA 0183 data from up to four marine instruments ( NMEA-talkers ) into a single data-stream for output to a computer port, chartplotter or other 'NMEA listener', such as a repeater instrument or auto pilot. A configurable fifth input port is available for connecting computer or chartplotter output or another NMEA data source.

The Brookhouse multiplexer is an essential component for the integration of  instrument/computer systems on board pleasure boats and commercial vessels. Versatility, functions and price/performance are unmatched by any other comparable products.

With AIS (Automatic Identification System) receivers and transponders now frequently used,  also on pleasure boats, the ability to combine standard low speed NMEA talk ers and high-speed AIS in one data-stream has become an important requirement. The Brookhouse standard multiplexer model supports connection of AIS receivers via a configurable (5th) input port. However, if besides AIS support, the multiplexer is also required to process return data from a computer or chart plotter, typically to feed an autopilot for steering to a waypoint or along a route, we recommend using one of the new Brookhouse multiplexer models with baudrate conversion (models AIS and AIS-C).

The standard model Brookhouse NMEA Multiplexer is very affordable, but loaded with useful features, including NMEA filtering and "on the fly" editing and including the "GPS backup switch" feature. Seatalk support is available as an optional extra. In Seatalk-mode, channel 1 is connected to the Raymarine Seatalk bus. Data from Seatalk marine instruments is converted into standard NMEA format and is output via the RS232 and RS422 output ports together with NMEA data from other instruments, connected to the 3 other channels. In this mode, the Brookhouse Multiplexer is effectively both a NMEA multiplexer and Seatalk bridge. The Seatalk page contains detailed information about the Seatalk Option for Brookhouse NMEA Multiplexers.

The Brookhouse NMEA Multiplexer uses the latest microcontroller technology which requires a minimum of components. This makes the device reliable and low cost. Smart firmware to manage and buffer the NMEA data ensures high efficiency and data-integrity.

Operation of the unit is fully automatic. When power is switched on, it starts acquiring data and starts outputting the combined data via the output-ports. More information www.brookhouseonline.com