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and the background colour will return to white again. It is possible to change all Talker ID’s first

and press Enter after changing the last one. Starting at the Talker ID field of input 1, pressing the

Tab key will jump to the Talker ID of the next input.

Clicking the Read Configuration button will read the Talker ID settings from the multiplexer. Any

modified Talker ID’s that have not been sent to the multiplexer (yellow background) will revert to

their original values. To clear a Talker ID, simply clear the edit box(es) by selecting them with the

cursor and press the Del or Backspace key on your keyboard and finally press Enter. An empty

Talker ID setting will show two dashes.

Real-Time

The Real-Time option bypasses the queue of an input. All incoming NMEA sentences are stored in a

queue - one for each input. Each queue can store several NMEA sentences, waiting for processing.

A GPS can output up to 13 sentences at once, every one or two seconds, and a queue can store

these sentences until they are processed and retransmitted.

An electronic compass however, only sends one heading sentence each time, but this can be up to

20 times per second. Due to this high frequency, a queue will be filled with a lot of heading

sentences. The ones that are retrieved from the queue for retransmission will therefore contain a

heading that can be up to 20 seconds old – much too old for a valid indication or for an autopilot to

steer on. This situation will also be indicated by the overflow LED on the multiplexer and the

indicators in the Input Overflow section on the MPX-Config screen.

When the Real-Time option is enabled, the queue for that input is bypassed. Only one single

sentence will be stored, waiting to be retransmitted within 200ms. The result is that some heading

sentences will be discarded but the ones that are passed have no significant delay.

This option should only be used for instruments like an electronic compass that output only one

single sentence. If used for a GPS for instance, only the first sentence of an entire group will be

passed, the rest will be discarded.

To Output 1 & 2

These options allow you to set the default route from the inputs to the outputs. The default route

as showed in the picture routes all inputs to Out2 and none to Out1. By default, the inputs are

always routed to the host port(s).

The default route is applied to an input when no specific route for that input exists in the sentence

filter. A match in the sentence filter always takes precedence over the default route.

NMEA Conversions

The result of NMEA conversions (see Options page) can be treated as if they were received on a

separate – virtual - input. The same settings of the real inputs can be applied to the NMEA

conversion results.

Computer Data

This controls the default route from the host (both USB and WiFi) to both NMEA outputs. Possible

options are No, Yes or Override.

No No data from the host is routed to the NMEA output.

Yes Data from the host is routed to the NMEA output and mixed with data from the inputs.

Override Data from the host is routed exclusively to the output and takes precedence over the

data from the inputs. When the host sends data to the multiplexer, no input data is

routed to the output. When the host stops sending data however, data from the inputs

will be routed to the outputs after a time out of 10 seconds.

The Override option is very useful when sailing alternately with our without a laptop or tablet.

Consider a typical set-up as shown below:

Wind

Comp-

pass

GPS Autopilot

Multiplexer

In 1

In 2

In 3

USB

Out 1

Tablet

Wiﬁ

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 43 44

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