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Acutime 2000 Synchronization Kit User Guide ix
Contents
B Timing Receiver Monitor
B.1 Start-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
B.2 Main screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
C NMEA 0183
C.1 The NMEA 0183 Communication Interface . . . . . . . . . . . . C-2
C.2 NMEA 0183 Message Format . . . . . . . . . . . . . . . . . . . C-2
C.3 NMEA 0183 Message Options . . . . . . . . . . . . . . . . . . . C-4
C.4 NMEA 0183 Message Formats. . . . . . . . . . . . . . . . . . . C-5
C.4.1 GGA – GPS Fix Data . . . . . . . . . . . . . . . . . . .C-5
C.4.2 GLL – Geographic Position – Latitude/Longitude . . . .C-6
C.4.3 GSA – GPS DOP and Active Satellites . . . . . . . . . .C-7
C.4.4 GSV – GPS Satellites in View. . . . . . . . . . . . . . .C-8
C.4.5 RMC – Recommended Minimum Specific
GPS/Transit Data . . . . . . . . . . . . . . . . . . . . .C-9
C.4.6 VTG – Track Made Good and Ground Speed. . . . . . .C-10
C.4.7 ZDA – Time & Date . . . . . . . . . . . . . . . . . . . .C-11
D Specifications and Drawings
D.1 Acutime 2000 GPS Smart Antenna Specifications. . . . . . . . . D-1
D.2 Acutime 2000 Standard Interface Cable Diagram . . . . . . . . . D-5
E NTP Diagnostics and Debugging
E.1 Diagnostics and Debugging . . . . . . . . . . . . . . . . . . . . E-1
E.1.1 System Log Entries . . . . . . . . . . . . . . . . . . . .E-1
E.1.2 Error Log Entries . . . . . . . . . . . . . . . . . . . . .E-3
E.2 Running NTP in Debug Mode . . . . . . . . . . . . . . . . . . . E-8
E.2.1 Debug Mode Not Available . . . . . . . . . . . . . . . .E-9
E.2.2 NTP Startup and Acutime Poll . . . . . . . . . . . . . .E-9
E.2.3 Acutime is not Responding . . . . . . . . . . . . . . . .E-11