Summary of Contents for Red Line Instruments FG1
- Page 1 FG1 FLUXGATE COMPASS USER MANUAL FG1 manual 01 November 2012 Software releases: 1.2.3 31oct2012 Hardware versions: V3 26jun2012 1 of 12...
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Page 2: Table Of Contents
1. Introduction and description of fluxgate compass. 1.1 Description of compass. The FG1 NMEA compass unit is a complete component for a compass indicating system, R ADAR ‘North-up’ input or autopilot. It is housed in a water-resistant enclosure so it can be mounted outside a steel hull. -
Page 3: Connections
NMEA IN- White NMEA IN+ Black Green NMEA OUT+ Blue Violet Furuno AD-10 Data Screen NOTE Conductors 5, 7 and 9 are connected together inside the FG1 1.2.2 Variants with suffix -CP Conductor Colour Type Function R ed + Supply Yellow... -
Page 4: Switches
Switch 1: Start the auto-calibration process Switch 2: Set reference NORTH heading. The FG1 must be mounted upright but at any azimuth. Pressing S2 sets the heading to zero and so can be done when the whole installation is headed North. -
Page 5: Power Supply
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 –... -
Page 6: To A Pc Serial Port
M agnetic Heading, Deviation, and Variation. But note that the information of Deviation and Variation is not sent and so blank fields are defined by consecutive commas. In the FG1 the sentence may have one of several forms typically of the general form: $HCHDG,hhh.h etc Where hhh.h is the magnetic heading from 000.0 to 359.9 degrees... -
Page 7: Why The Compass Needs Calibrating
1/6 of a degree. At the same time the FG1 would be also sending the NMEA data to a precision of 1/10 of a degree. Clock Data Duration of data is x16 clocks each 480µs high=low=30 µs. Total = 480µs. -
Page 8: Setting Reference North Heading
NOTE that there should be a delay of at least 5 seconds after termination before a new calibration process is initiated. 4 .4 Setting reference NORTH heading Switch 2 (and also a NMEA command) is provided to set ‘zero’. The FG1 should first be auto-calibrated then be aligned to North 4 .5 Set-up suggestions... - Page 9 0183 input. Once configured, the compass will remember those settings every time it is powered up. Response: When any of the following input sentences are received the FG1 will reply with an ‘ acknowledge’ output sentence of the format: $PATC,HCHDG,ACK<CR><LF>...
- Page 10 5.6 Set the internal filtering: ('damping') $PATC,IIHDG,DHD,ddd.d<CR><LF> Valid range for d is 0 to 100.0% 5.7 Enable LED: $PATC,IIHDG,ELED<CR><LF> R eplies with the standard acknowledge sentence ($PATC,HCHDG,ACK<CR><LF>). Default: LED enabled. 5.8 Disable LED: $PATC,IIHDG,DLED<CR><LF> R eplies with the standard acknowledge sentence ($PATC,HCHDG,ACK<CR><LF>). Note : LED will be automatically enabled during calibration process.
- Page 11 5.11 Configure the output sentence structure and type: $PATC,IIHDG,CFG,abc<CR><LF> [Replies with the standard acknowledge sentence $PATC,HCHDG,ACK<CR><LF>. ] Where 'a' is heading sentence type as follows: a=0 : $HCHDG,hhh.h,,,,<CR><LF> a=1 : $HCHDT,hhh.h,T<CR><LF> a=2 : $HCHDM,hhh.h,M<CR><LF> a=3 : $HCHCC,hhh.h<CR><LF> a=4 : $HEHDT,hhh.h<CR><LF> a=5: no heading data sent hhh.h is the compass heading in degrees...
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Page 12: References
+ (or missing) turning to starboard (i.e. heading value is increasing) turning to port (i.e. heading value is decreasing) and cc = checksum xxx.x = Rate of Turn in degrees per minute References FG1 data sheet NMEA-0183 specification 12 of 12...