If the external power to the unit fails for any reason, the navigator will
remember if it was on or off for about 20 minutes. That is if the navigator was
on when the power failed and the power comes back within 20 minutes, the
navigator will turn itself on again. Otherwise, it will stay turned off until the
key is pressed.
Equipment Interfacing
Introduction
The MX510 has two user NMEA ports while the MX512 has nine. Any of these data
ports can be used to communicate with other external equipment using the standard
NMEA 0183 protocol. All NMEA interface ports are configured for RS-422 standard. This
configuration complies with all NMEA 0183 hardware versions. The RS-422 electrical
interface will almost always work with the older NMEA 0183 version 1.5 electrical
interface; both of which are balanced line interfaces. If for some reason you can’t get
this interface to work, use an RS232 -to-RS422 interface converter.
Other features available from the MX51x are:
External Man-Over-Board (MOB) switch input (also used for quick save of waypoint) •
Pulse speed log input
•
Pulsed speed log output
•
External alarm
•
Compass row displays (when connected to an MX575 GPS Compass)
•
Refer to Section 5 of this manual for wiring information.
External Man Over Board & Event
An external push button (normally open) switch can be connected between the pin 1
(MOB/Event) input and REF GND of the AUX cable to activate the MOB/Mark function.
The Man-Over-Board (MOB) function is activated when the external switch is pressed
and held for 3 seconds. Once activated, the MOB condition can only be canceled from
the MX51x front panel display. Refer to the Operation section of the manual for this
operation and more details on the Man Over Board function. When this switch is pressed
for 1 second, this causes your present position and time to be stored as a waypoint
in the waypoint bank. A message indicating which waypoint number is used will be
displayed on the MX51x screen for up to 5 seconds.
Speed Over Ground Pulse Output
The MX51x can output the GPS calculated speed over ground in a pulse format.
The pulse output is derived from pins 7 (orange) & 2 (green) of the AUX cable. The speed
log out (+) is the orange wire, while the speed log (-) is on the green wire. It is a 0-12
Volt signal pulse.
To setup the MX51x speed pulse output, press the CFG key then scroll down to Log
Pulses menu. Press the E key, then press the ENT key to change the Emulation enabled
to Yes (default value is No). This menu also controls the number of pulses per nautical
mile (200 is the pre-selected value). Press the E key when you are done with editing.
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