| 21
If a GPS or chartplotter is connected to the Tillerpilot, it can extract
the data necessar
y for Nav mode. Other functions, such as Steer To
Wind, may also be available if NMEA 0183-compatible instruments
are transmitting the correct NMEA sentences.
When connecting an external (“talker”) unit to the Tillerpilot, two
terminals are used – usually labeled DATA and COMMON (or COM).
These should be connected to the Tillerpilot’s NMEA cable as
follows:
NMEA talker unit Tillerpilot NMEA
NMEA Out Data/+ Data (Red)
NMEA Out Common/- Common (Blue)
¼ Note: Some third party equipment does not have a dedicated
COMMON connection. In this case, the DATA connection will
usually be labeled NMEA OUT and the NMEA Common wire from
the Tillerpilot should be connected directly to 0 V (terminal 2). If in
any doubt, refer to the manufacturer or Simrad’s Product Support
department for advice.
Warning: Due to the limitations of NMEA 0183, it is
recommended that only one talker is transmitting to the
Tillerpilot at any one time – i.e. instruments or GPS/chartplotter,
not both simultaneously! If more than one unit needs to be
interfaced to the Tillerpilot, these should be connected to the
NMEA cable via a changeover switch.
Because of the vast number of different manufacturers and models
of navigational equipment, Simrad cannot guarantee correct
operation and installation of third party equipment. Therefore,
before connecting any equipment to the Tillerpilot it is important
that the unit’s manual is referred to with regard to interfacing via
NMEA.