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Title: Vehicles/Watercraft/Parts and Accessories/Electronics - Brookhouse NMEA 0183 multiplexer for connection of multiple marine instruments such as GPS, wind-instruments, fluxgate compass, depth sounder, and auto-pilot, to a RS232 (laptop) computer port.
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NMEA Multiplexer with optional Seatalk-NMEA bridge + USB.
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NMEA Combiner /
Multiplexers
Products and Features Overview
Model AIS
and Model AIS-C
The Brookhouse standard NMEA Combiner
/ Multiplexer combines NMEA 0183 data from up to four marine instruments (
NMEA-talkers ) into a single data-stream for input via a single computer port,
or “ NMEA listener ”. A
configurable fifth input port is available for receiving return data from a
computer for auto pilot control or for connection of a NMEA HS talker such
as an AIS receiver. The term " NMEA Multiplexer " is widely used, but
the device is also often referred to as " NMEA Combiner ". Brookhouse
multiplexers offer high reliability and unique features at affordable prices. Installation
of a Brookhouse multiplexer is straight forward. All connections are made via
clearly marked screw-terminals on the outside of the multiplexer.
The most important characteristic of a
good multiplexer is its ability to maintain data-integrity even under very high
NMEA input load conditions. This is to a high degree determined by the
efficiency of the multiplexer's buffering mechanism. The buffering system of the
Brookhouse multiplexers is second to none, which is reflected in the excellent
performance. This is made possible by the use of the latest state of the art
micro-processors and well-designed firmware. Read what Brookhouse users
say about the product: Click here.
With AIS (Automatic Identification System) receivers now
frequently used, the ability to combine standard low speed NMEA talkers and
high-speed AIS in one data-stream has become an important requirement. The
Brookhouse standard multiplexer models support 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 following data-sheets describe 2
new AIS models with that are now available, both with baud rate conversion:
mux_ais.pdf
mux_ais_c.pdf
Brookhouse multiplexers offer many extra features, most of which are
included in all models. During years of experience with setting up integrated
computer/instrument systems, we have come across various problem areas in
NMEA connectivity. To tackle these problems, we have created effective
solutions embedded in the multiplexer firmware, which can be activated by the
user, as
needed.
We do not offer these extras in
expensive "advanced" models, they are available in all Brookhouse multiplexers. The
advanced features are activated and configured during a simple Setup procedure,
whereby the options can be selected from a menu. Click here
to see what it looks like. However, if only the basic
multiplexer functions are required, no setup is necessary. Many of the
Brookhouse multiplexer options are unique
and are not available in other products. Some of them are described hereunder:
Filtering and
NMEA data manipulation
Brookhouse multiplexers offer comprehensive
filtering and data manipulation capabilities, even in the standard model. Filtering is
very useful to alleviate the load placed on the navigation software or
instruments by
selectively removing redundant data. On
the fly editing allows the user to
program the multiplexer to make changes to NMEA sentences as they pass through
the multiplexer. In integrated instrument/computer systems these tools, only
found in Brookhouse multiplexers, are extremely useful for fine-tuning and will
help to get the most out of instruments and computer. Not needed at the moment?
You don't pay any extra for these features and it is good to know that if you
encounter a NMEA compatibility problem one day, your multiplexer can offer a
solution. Even complete NMEA sentence translations are possible. For example, you may
install a new GPS that outputs NMEA 3.01 but your older autopilot needs NMEA 1.5
sentences. The multiplexer can be programmed in a simple way by the user to do
the required sentence translation. You can also ask Brookhouse support if the
required translation has been done before and if so, we'll be happy to give you
the "script", which is loaded in your multiplexer following a few easy
steps. Click here
for more information.
Automatic GPS
back-up switching
Another important feature, also unique
for Brookhouse multiplexers, is GPS back-up switching. This solves the
problem of switching to a backup GPS if the main GPS fails. This is particularly
important when sailing in waters with many navigation hazards. Interruption in
the electronic navigation is avoided which makes this a valuable safety
feature. We received the customer comment recently that this mechanism alone
justifies installing a Brookhouse multiplexer. (Click here for
more information)
NMEA Data Pacing
Some instruments, such as some
electronic compasses, send NMEA data at such high rates that it causes
congestion. Navigation software slows down or cannot handle the large number of
NMEA sentences. The Data Pacing option, which is available in all Brookhouse multiplexers, is
the ideal solution to this problem. (Click
here for more information)
NMEA bridge for Raymarine Seatalk
A low-cost Seatalk interface option is available for all
Brookhouse multiplexers which allows connection of the Raymarine Seatalk
bus to one of the multiplexer ports. Raymarine instrument data
from all instruments, available on the ST-bus
is translated by the multiplexer into standard NMEA sentences and output
together with sentences from other NMEA sources. The mux "Seatalk
port" is still configurable as NMEA port too. By combining the multiplexer
function with the Seatalk to NMEA conversion, an efficient system is created
which results in important cost savings. (Click here for
more information)
Using a low-cost
GPS PS2 mouse as primary or backup GPS
GPS mice can usually only be plugged
in directly into a laptop or PDA. A low-cost PS2 connector option now allows a
PS2 GPS mouse to be plugged into the Brookhouse multiplexer as one of the NMEA
talkers. Power is supplied by the multiplexer. Read more here.
USB and wireless
multiplexer connections
The USB option is very popular for
connection to laptop computers without serial port and is sold with over 50% of
our multiplexers. The USB port is extra, the USB model also has a
serial port connector for output to a repeater, radar, etc. In the near future
we will also offer a Bluetooth model for wireless connection to the
computer.
There are 4 models Brookhouse NMEA Multiplexers
available:
Our standard, very affordable NMEA Multiplexer,
loaded with useful features. All
connections and Baudrate select are external for easy installation. Optional RayMarine Seatalk to
NMEA conversion (Seatalk bridge). Optional integral USB interface for
use with laptops without serial port. Optional 5th port for AIS receiver. Click on the picture above for a detailed
description, specs. and how to order.
Models NMUX-AIS and NMUX-AISC. The photo shows
model NMUX-AISC. Both models combine standard NMEA talker data at 4800bps
with high speed 38400 bps output from an AIS receiver. The combined data
stream is transmitted at 38400bps to a computer or chart plotter. With the
computer or chartplotter input set to 38400, the NMEA output is also
transmitted at 38400 bps. The reason is that in- and output baudrates of
computer ports and chart plotters such as the Raymarine C- and E-series
cannot be set independently and are always the same for both directions.
Consequently, if the computer or chartplotter's output is required to feed a
standard NMEA listener such as an auto pilot, a DSC radio, a repeater
instrument etc, the baudrate of 38400 has to be reduced to 4800. The
baudrate conversion function of the multiplexer is independent from its
combine-function, with its own input and output port. The only difference
between models AIS and AISC is that model AIS has an extra RS422 port for
output to the Raymarine C- or E-series. The USB and Seatalk options are
available for both models.
For full specs and detailded description, click on the following links for
data-sheets:
mux_ais.pdf
mux_ais_c.pdf
The Brookhouse model NMEA mux with user-programmable LCD display. It has all
the features of the standard NMEA mux plus display unit with LCD and selection button.
Seatalk support is optional. Optional integral USB interface for use
with laptops without serial port. The
compact display unit is an ideal NMEA and Seatalk repeater for use inside (e.g.
at chart table). The LCD is now fully user-programmable. Any data embedded
in NMEA sentences that pass through the multiplexer (including Seatalk) can
be displayed in a format and at a screen position determined by the user,
preceded or followed by user-chosen descriptive text or symbols. All for the price you pay elsewhere for a basic NMEA mux
only. Click on the picture above for a full description, specs
and how to order.
Brookhouse
User Comments
Prices,
ordering and payment
More
technical information
Brookhouse
home
NMEA-start
Note:
Seatalk is a trade-mark of RayMarine.
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NMEA | 0183 | multiplexer | for | connection | of | multiple | marine | instruments | such | as | GPS, | wind-instruments, | fluxgate | compass, | depth | sounder, | and | auto-pilot, | to | a | RS232 | (laptop) | computer | port. |
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http://brookhouseonline.com/nmeamux.htm
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NMEA 0183 multiplexer for connection of multiple marine instruments such as GPS, wind-instruments, fluxgate compass, depth sounder, and auto-pilot, to a RS232 (laptop) computer port.
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