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Simrad MX500 | 175

Equipment Interfacing

Introduction

The MX500 has two user NMEA ports. Anyone of these

ports can be used to communicate with other external

equipment which utilize the NMEA 0183 standard. All

NMEA interface ports are configured for RS-422 stan-

dard. This configuration complies with NMEA 0183 ver-

sion 3.0 and earlier. 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 MX500 are:

External Man-Over-Board (MOB) switch input (also •

used for external Event input)

Pulse Counter inputs for the speed log, •

Pulsed Log output. •

External alarm •

Compass row displays (when connected to an MX575A •

GPS Compass)

Refer to the Installation Section of this manual for inter-

face instruction.

External Man Over Board & Event

An external push button switch can be connected be-

tween the pin 1 (MOB/Event) input and REF GND of the

AUX cable . Connect the appropriate MOB/Event pins to a

normally open push-button switch.

The Man-Over-Board (MOB) function is activated when

the external switch is pressed for 3 seconds. Once acti-

vated, the MOB condition can only be canceled from the

MX500 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 dis-

played on the MX500 screen for up to 5 seconds.

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Memorex RX 1 Smart Installationshandbuch Seite 176