Autonnic A5022 사용자 설명서 - 페이지 5

{카테고리_이름} Autonnic A5022에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Autonnic A5022 12 페이지. Fluxgate compass

1.5

Power supply

The compass is compatible with any DC power supply of between 8 and 30 Vdc. Typical supply

current during operation is approx. 25mA. The compass is protected against reversed

polarity.

Note that the operation of the LED adds another 10mA and that during auto-calibration the

consumption can be as high as 60mA.

Care should be taken to make sure the compass is not situated too close to the power supply, as

it's accuracy may be affected by either the iron in the mains transformer, or by magnetic field

'noise' from a switching power supply. It is not possible to cover all possible scenarios here,

and it remains up to the user to determine the suitability of a possible location for the

compass.

Note that the output from the A5022 takes several seconds to stabilize after a power is applied;

the time taken depends on the damping settings. There is a command - see section 5 –

which can be used to suppress the output after power-up.

1.6

The compass is fixed to the chassis of the vessel or vehicle in the upright position using the fixing

holes shown in the data sheet. It does not matter which way it faces as the azimuth can be

set to North at any time the chassis is orientated North. Alternatively if the azimuth of the

chassis is known, then the A5022 may be rotated before fixing to North using a protractor.

S2 is then pressed and then the compass can be mounted on the chassis.

2.1 Compass to a NMEA-0183 instrument

The hardware on which the NMEA-0183 standard is based on is a balanced serial protocol called

RS422. This means that two wires are need for send and two for receive.

6 NMEA OUT +

GND

4 NMEA IN+

NMEA current

source

3 NMEA IN-

External NMEA device

Fig 2

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