2-25
Installation
Chapter 2: Installation
98-144591-D
Position and time information
2.7 Position and time information
2.7.1 Connection of Navigation Equipment
Navigation equipment complying with the NMEA 0183/IEC 61162-1 standard may be connected for
automatic position and time updating. Connection is made to the NMEA+/NMEA- connections in the
Control Unit ACC connector or the NMEA+/NMEA- connections in the Transceiver Unit AUX or SYSCON
connector.
The NMEA receive circuit consists of an optoisolator with a 470 ohms series resistor to insure current
mode operation and a shunt diode to limit reverse bias as shown below. The circuit is isolated from ground.
The circuit operates with a minimum
differential input voltage of 2 volts
and draws less than 2 mA from the
line at that voltage. The maximum
voltage is 15 volts.
Interconnection between devices may be by means of two-conductor shielded twisted-pair cable.
Multiple listeners may be connected to a single talker. The receivers are connected in parallel. The shield
should be connected to the navigator chassis and should not be connected at any listener. However the
shield should be continuous (unbroken) between all listeners.
Supported sentences:
GLL (longitude, lattitude, utc, status, mode)
GGA (longitide, lattitude, utc, quality )
RMC (longitude, lattitude, utc, status, mode)
GNS (longitude, lattitude, utc, mode)
ZDA (utc, day, month, year)
Only the mentioned fi elds are used - the rest are discarded.
NMEA data on the LAN-connection is also accepted. This data should comply with IEC 61162-450.
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