Autonnic A4032 Manuale d'uso - Pagina 3

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1. Description

The Autonnic A4032 is a complete sensing and processing sub-system for

a compass indicating system which gets its heading information from a

main or 'master' compass. It derives its output from the position of the

powerful permanent magnet inside the main compass.

The A4032 contains a dual-axis fluxgate magnetometer surrounded by

high-precision interface circuits which, together with the special

clockwise/anticlockwise and a sequence to null offsets allow a

microprocessor to acquire a binary value from the two orthogonal sensors

of the direction of the field created by the main compass. The processor

calculates the vector from these values 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.

The embedded software can be uploaded by command so that special or

updated versions releases can be put into the A4032 to replace the

previous software. These data files may be sent from Autonnic by email

or downloaded from our website.

2.1

The A4032 is fixed to the base of the ship's compass using the fixing holes

shown in the data sheet. The cable hangs down directly from the labelled

side of the housing.

It does not matter which way it faces as the azimuth can be set to North

at any time. But some installers prefer to align the internal sensor to

magnetic North and to facilitate this the A4032 is provided with an

alignment mark and a rotatable housing assembly.

NOTE 1 The heading data is suppressed when the field is low – see the

RXY command in section 4.2.14

NOTE 2 The heading data is also suppressed when the field is high. See

4.2.14

2.2

The compass is compatible with any DC power supply of between 8 and

30 V but note that for nominal 24V operation a 1W resistor of 330ohms

should be inserted in the supply wire. This applies to any power supply of

greater than 18V. Note that the maximum voltage must not be greater

than 30V.

Typical supply current during operation is approx. 25mA. The compass is

protected against reversed polarity.