Astra A5040 Manuale d'uso - Pagina 3

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1. Introduction and description of fluxgate compass.

1.1 Description of compass.

The Astra Yacht NMEA compass unit is a complete component for a compass system indicating,
RADAR 'North-up' input or autopilot. It is housed in a water-resistant enclosure so it can be
mounted outside a steel hull. It delivers heading data in two industry-standard forms.
The A5040 contains a fluxgate with floating core surrounded by high-precision interface circuits, which,
together with the special clockwise/anticlockwise and offset nulling sequence allow a
microprocessor to acquire a binary value from two orthogonal sensors of the horizontal component
of the Earth's magnetic field. The processor calculates the vector from these values, uses a
calibration table to correct for local field disturbance errors, offsets the result and then presents the
data in a manner which has been requested. Such requests alter the frequency of the data, the
degree of filtering and the offset value. Calibration sequences can also be commanded.

1.2 Connections

1.2.1

Normal

Conductor
Colour
1
Red
2
Yellow
3
Brown
4
White
5
Black
6
Green
7
Blue
8
Violet
9
Screen
NOTE Conductors 5 and 7 are connected together inside the A5040
1.2.2
Variants with suffix -CP
Conductor
Colour
1
Red
2
Yellow
3
Blue
4
Green
NOTE Cable foil and drain wire internally connected to GND
Type
Function
P
+Supply
O
Furuno AD-10 Clock
I
NMEA IN-
I
NMEA IN+
P
GND
O
NMEA OUT+
P
GND
O
Furuno AD-10 Data
Type
Function
P
+ Supply
I
NMEA IN +
P
GND and NMEA IN -
O
NMEA OUT +
8-30v
3