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GFX Manual
EATON
GFX Installation and Operation Manual April 2020 www.eaton.com
GSA
GPS DOP and active satellites
The GSA messages indicates the GPS receiver's operating mode and lists the satellites used for navigation and the DOP values of the position solution at 1 hz update rate.
Field
Description
0
Message ID $GPGSA
1
"Mode: M = Manual, A = Automatic. In manual mode, the receiver is forced to operate in either 2D or 3D mode. In automatic mode,
the receiver is allowed to switch between 2D and 3D modes subject to the PDOP and satellite masks."
2
Mode 2, Fix type, 1 = not available, 2 = 2D, 3 = 3D
3 - 14
"PRN numbers of the satellites used in the position solution. When less than 12 satellites are used, the unused fields are null"
15
Position dilution of precision: 0.5 through 99.9
16
Horizontal dilution of precision: 0.5 through 99.9
17
Vertical dilution of precision: 0.5 through 99.9
hh
The checksum data, always begins with *
VTG
Track made good and speed over ground
The VTG message conveys the actual track made good (COG) and the speed relative to the ground (SOG) at 1 hz update rate.
Field
Description
0
Message ID $GPVTG
1, 2
Track made good relative to true north
3, 4
Track made good relative to magnetic north
5, 6
Speed over ground (SOG) in knots
7, 8
Speed over ground in kilometers/hour (kph)
9
Mode indicator:
A=Autonomous mode
D=Differential mode
E=Estimated (dead reckoning) mode
M=Manual input mode
S=Simulated mode
N=Data not valid
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The checksum data, always begins with *
RMC
Position, velocity, and time
The RMC message contains the time, date, position, course, and speed data provided by the GPS navigation receiver at 1 hz update rate. A checksum is mandatory for this
message and the transmission interval may not exceed 2 seconds. All data fields must be provided unless the data is temporarily unavailable. Null fields may be used when
data is temporarily unavailable.
Field
Description
0
Message ID $GPRMC
1
UTC of Position Fix (when UTC offset has been decoded by the receiver).
2
Status:
A - Valid
V - Navigation receiver warning
3, 4
Latitude, N (North) or S (South).
5, 6
Longitude, E (East) or W (West).
7
Speed over the ground (SOG) in knots
8
Track angle in degrees true
9
Date: dd/mm/yy
10, 11
Magnetic variation in degrees, E = East / W= West
12
"Position System Mode Indicator:
A = Autonomous
D = Differential
E = Estimated
M = Manual input
S = Simulation mode
N = Data not valid"
hh
The checksum data, always begins with *
