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The MiniPlex-42BT is our advanced model
Bluetooth« enabled NMEA multiplexer, offering 4 galvanically
isolated NMEA inputs, 2 NMEA outputs, a Bluetooth and an RS-232 interface.
The MiniPlex-42BT communicates with a
computer or a PDA through its' Bluetooth wireless interface for
computerized nagivation. No cables need to be attached. Just placing your
laptop at the chart table, or just being on board for that matter, is
enough to communicate with your navigation system. Both NMEA outputs
(talker ports) allow distribution of the NMEA data to up to eight
The RS-232 port can be used in the same way
as the Bluetooth interface. Data from the instruments is available on both
interfaces simultaneously. Data from connected computers is received on
both interfaces, combined and sent to the NMEA Output.
This is very useful when a fixed computer is permanently connected to the
RS-232 port, while a PDA with a Bluetooth interface is used as a portable
system or a repeater. When the multiplexer is set to Hub mode, it will
even pass information from the computer to the PDA and vice versa.
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The MiniPlex-42BT has a rich set of features and
configuration options, enabling the user to tackle almost any NMEA bottleneck or
interface problem. The supplied Windows utility MPX-Config allows full
configuration of the multiplexer and monitoring of NMEA data passing through the
||When the Seatalk -> NMEA option is
selected, NMEA In 4 becomes a SeaTalk« compatible input,
offering conversion of the most common SeaTalk datagrams on a Raymarine«
network into NMEA sentences.
||Server: Data received on the NMEA
inputs is sent to the computer. Data received from the computer is sent
to a NMEA ouput.
Hub: All received data (on the
NMEA inputs and from the computer) is sent to the NMEA output.
Auto: Automatic selection between Server
and Hub mode. This is a useful feature for people who have a GPS
and an autopilot connected to the multiplexer, and sometimes wish to
sail without taking their laptop on board. When the laptop is not
connected, the multiplexer is in Hub mode and crosstrack- and
waypoint information from the GPS is directly sent to the autopilot.
When the laptop is connected and sending data, the multiplexer
automatically switches to Server mode and the autopilot will
receive crosstrack- and waypoint data from the laptop instead.
The Auto mode also serves as an
emergency backup: when the laptop or computer crashes, the multiplexer
will fall back to Hub mode after a time-out of 10 seconds.
||A flexible NMEA filter can be configured
to pass or block specific sentences from each input channel. This
greatly reduces the chance of an overflow and the resulting loss of
data. Many GPS receivers for instance, transmit RMC, GSV, GSA, GLL and
GGA sentences every second, accounting for 85% of the available
bandwidth of the NMEA channel. By blocking unwanted or unnecessary
sentences, bandwidth is preserved for other instruments.
||Gyro- and fluxgate compasses produce NMEA
sentences at a high rate (10 sentences/second or more). This can lead to
a buffer overflow in the multiplexer. Although this overflow is handled
properly without data corruption, it will lead to a delay of NMEA
sentences of up to 20 seconds in extreme situations. This produces a
severe problem for autopilots, which cannot make proper course
corrections when their heading feedback is delayed for 20 seconds. The
Real-Time option prevents this delay by bypassing the buffer of that
specific channel and forwarding the data immediately to the multiplexers'
NMEA output. As a result, the heading is never delayed more than 0.2 to
0.5 seconds, depending on the amount of other NMEA sentences passing
through the multiplexer.
||This option converts a Magnetic Heading
sentence (HDG) into a True Heading sentence (HDT). If the originating
magnetic heading sentence contains a magnetic variation, it is used to
calculate the true heading before conversion. This feature is useful for
certain equipment like VDR's which need a true heading input, while the
only available heading source is a fluxgate, delivering a magnetic
||With Channel Priority enabled, similar
NMEA sentences on different inputs are only passed from the input with
the highest priority. The RS-232 port has the highest priority, followed
by inputs 1 to 4, in descending order. When for instance two GPS
receivers are connected to inputs 1 and 2, and both transmit the same
type of NMEA sentences, only those received on input 1 are passed. A
time-out function ensures that similar sentences from the GPS at input 2
are passed when the GPS at input 1 stops sending these sentences.
Another example is where a GPS provides an SOG to a windmeter, while the
latter repeats the sentences from the GPS. When the GPS is connected to
input 1 of the muliplexer (high priority) and the windmeter to input 2
(lower priority), the GPS sentences coming from windmeter will be
blocked automatically while wind related sentences are passed.
||When this feature is switched on, the
multiplexer will transmit a proprietary NMEA sentence indicating on
which input channel the following NMEA sentence is received.
VirtualPlex-1 uses this to route NMEA sentences from specific inputs to
specific virtual COM ports (Channels option).
||The Channel ID option changes the talker
ID of every incoming NMEA sentence in "Mx" where 'x' is a
number from 1 to 4, according to the input the sentence was received on.
Example: an incoming GPRMC sentence on input 2 is changed in M2RMC. This
is useful to distinguish between sentences from two similar instruments.
|Talker ID substitution
||Talker ID substitution changes the talker
ID of incoming sentences in a similar way as the Channel ID option does,
but now the talker ID can be specified for each input channel. This
option is useful for software or instruments that expect a specific
||8-30VDC, secured against reversed
||100mA (150mA max. with fully loaded talker
ports and active Bluetooth connection)
||4 x NMEA-183/RS-422, galvanically isolated
||1 x Bluetooth/RS-232, 2 x NMEA-183/RS-422
||Class 1 device, range up to 100m
||5 buffers of 1000 characters (4 x NMEA, 1 x
|Filter list size:
||50 sentence types
|Priority list size:
||50 sentence types
|Speed NMEA in:
|Speed NMEA Out1/RS-232/Bluetooth:
||38400 Baud (NMEA 0183-HS)
|Speed NMEA Out2:
||138 x 62 x 30mm