QK-A035 Manual
V 1.0
15 of 19
2021
5.4 Configuring routing and filtering
Figure 10 Routing &Filtering
The A035 features filtering and routing. Specific input data can be filtered out and ignored by the
multiplexer while the remaining data can then be routed to specific outputs.
Filtering options:
Each input also has a flexible filter that can be configured to pass or block specific
sentences from entering the multiplexer. This frees up bandwidth, significantly reducing the possibility of
data overflow and the resulting loss of data.
Routing options:
The powerful routing feature allows the remaining NMEA, SeaTalk
¹
and WiFi input
data to be routed from any input and limited to the desire outputs.
Filtering and routing allow the A035 to reduce the processing data load by disabling these unneeded
input sentences from specific NMEA outputs. GPS receivers for example often transmit an abundance
of sentences every second and can fill much of the available bandwidth of an NMEA 0183 port at
4800bps. By filtering out any unnecessary data, bandwidth is saved for other devices
’ data.
It also solves the conflict in the case where two similar NMEA devices provide the same types of
sentences. Operators may choose to enable this data on one input only (filtering), and/or to route each
input to a specific output (routing).
5.4.1 Filtering: black list setup
Each input port’s black list can block up to 8 types
sentences.
Most chart plotters have their own sentence filter,
however for most PC/mobile phone
-
based applications,
this is not the case. Using the black list to filter
unnecessary sentences is very helpful.
Remove the ‘$’ or ‘!’ from the 5-digit NMEA talker and
sentence identifier and insert the input separated by
commas as shown here
:
For example to block ‘!AIVDM’ and ‘$GPAAM’ enter ‘AIVDM,GPAAM’. If blacklisting SeaTalk¹ data, the
corresponding NMEA message header should be input (see SeaTalk¹ section for a full list of converted
messages).
5.4.2 Routing data away from chosen outputs
As a default, all inputs’ data (excluding any filtered data) is routed to all outputs (NMEAx2, WiFi and
