A
-
8 and 2 above
B
-
8 and 3 above
Etc.
A separate document describing the baudrate conversion options in more detail is available from
Brookhouse.
Important:
In spite of the filtering out of the AIS data, the bandwidth of the 4800 output may potentially still
be insufficient to transmit all data from the 38400 output data stream. Reducing the baudrate
from 38400 to 4800 means effectively a reduction in bandwidth by a factor 1/8. Normal combined
traffic from slow NMEA talkers only will hardly ever cause this situation to occur, but if the
bandwidth is exceeded, use the channel block mask or the Brookhouse filter feature to selectively
filter out redundant NMEA sentences.
Setup
Setup for the AIS-C is only required for disabling/enabling the Seatalk option, to upload
filter/editing/LCD directives or to select options such as backup switching. It is assumed that
Windows program Hyperterminal is used for setup, but other terminal programs can be used
instead.
Setup via RS232
The connections labeled “
Yellow C-series NMEA Out +
”,
TxD
and “
Brown C-series NMEA Out
–
“ are used for communication with the computer during setup. Switch the C-/E-series chartplotter
off. Disconnect the yellow and brown wires from the C-/E- series NMEA cable from the mux and,
assuming a 9-pin D-sub computer connector, connect an RS232 cable as follows:
Computer serial port pin 3
“Yellow C-series NMEA OUT”
Computer serial port pin 2
TxD
Computer serial port pin 5
“Brown C-series NMEA Out –“
Set the baudrate in Hyperterminal to
38400 bps.
Execute the setup procedure as described in
the manual for the standard multiplexer model. After setup, disconnect the RS232 cable and re-
connect the yellow and brown wires from the C-series.
Setup via USB
Switch off the C-series. Remove the yellow wire (C-series NMEA Out) from the mux terminal if
the C-/E- series is already connected.
Under the large green connector block a blue wire can be found. Remove the insulation from this
wire and insert it in the terminal labeled “
Yellow C-series NMEA Out+
”. Set the baudrate in
Hyperterminal to
38400 bps.
Execute the setup procedure as described in the manual for the standard multiplexer model.
When finished, remove the blue wire, insulate it and re-insert the yellow wire of the C-series
NMEA output.
Backup GPS
Assuming the C-series chart plotter receives GPS lat/lon from a Seatalk GPS, we recommend
connecting a backup NMEA GPS via the mux. A separate document that can be found on the
USB driver CD in folder ‘documentation’ or on the Brookhouse website describes the advantages
and method. The multiplexer can detect when the Seatalk GPS stops functioning and switches to
the NMEA GPS automatically.
