Interfacing Via Nmea - Simrad AP14 Manual

12v DC
SHC14 Control Unit
SHS12 Compass
Page 30
SRD12 Drive Unit
Brown / Blue
SJB12 Junction Box
NMEA0183 In
Fig 5.11 - AP14R electrical installation

5.8 Interfacing via NMEA

The AP14 includes an inbuilt NMEA0183 inter-
face so GPS, Loran and Chart Plotters can be
connected directly to it. This allows the Nav
Mode (Steer to GPS) function to be used.
To interface with the AP14, the NMEA OUT
connections of the equipment should be wired
to the respective NMEA IN Data and Common
(COM) cores of the NMEA wire from the SRD12
drive unit (Fig 5.12).
NMEA Data - RED
NMEA Common - BLUE
• Some manufacturers may refer to the connec-
tions as NMEA OUT + and – instead of NMEA
Data and Common.
• Certain equipment may have connections
marked NMEA IN. Do not use these.
• If the equipment does not have a NMEA
Common (or –) connection, the NMEA
Common terminal of the SCP12 course com-
puter should be connected to ground by link-
ing it to the BATT – terminal (Fig 5.13).
• If the vessel has more than one battery bank,
when connecting the AP14 to the power supply
always check that the pilot and the receiver are
not connected to a different battery bank. This
is to avoid a possible voltage drop between the
interfaced equipment which would render the
equipment inoperative.
• The receiver must be running an active route or
waypoint for the Nav Mode function to operate.
• While any NMEA0183 compatible receivers
should interface with the AP14, Simrad cannot
guarantee operation with other manufacturer's
equipment, as the Nav Mode function is
dependant on specific NMEA0183 sentences of
the correct format being available (see section
7.3). Read the relevant section in the receiver's
manual before attempting to interface the AP14
with this equipment. If necessary, contact the
manufacturer's technical support department
or speak to a qualified technical dealer.
Fig 5.12 - Connecting using NMEA interface
BLUE
NMEA OUT
COMMON (–)
Fig 5.13 - Connecting using NMEA interface :
no Common (–) wire
Page 31
0v