Red Line Instruments FG1 User Manual
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1.5 Power supplyThe compass is compatible with any DC power supply of between 8 and 30 Vdc. Typical supplycurrent during operation is approx. 25mA. The compass is protected against reversedpolarity.Note that the operation of the LED adds another 10mA and that during auto-calibration theconsumption can be as high as 60mA.Care should be taken to make sure the compass is not situated too close to the power supply, asit’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 thecompass.Note that the output from the FG1 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 MountingThe compass is fixed to the chassis of the vessel or vehicle in the upright position using the fixingholes shown in the data sheet. It does not matter which way it faces as the azimuth can beset to North at any time the chassis is orientated North. Alternatively if the azimuth of thechassis is known, then the FG1 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 Connecting the compass to your application2.1 Compass to a NMEA-0183 instrumentThe hardware on which the NMEA-0183 standard is based on is a balanced serial protocol calledRS422. This means that two wires are need for send and two for receive.Fig 25 of 12E ternal NMEA device6 NMEA OUT +4 NMEA IN+3 NMEA IN-5 GNDNMEA currentsource+- |
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