GER 1500 USER MANUAL

Appendix FGPS Input SpecificationAPPENDICES 43The GER 1500 accepts and records GPS information presented on its COM1 input. TheGER1500pda software (option) also reads GPS data from a card inserted into the PDA’sinternal card slot.In order to be accepted, the GPS information must conform to the following specification:Signal LevelsThe GER1500 accepts EIA RS-232 Standard signal levels. The GPS device connects to theGER 1500 COM 1 port via the following pins:Signal Name GER 1500 COM 1(Standard)GER 1500 COM 1(Modified For Use WithThe Underwater HousingOption)GPS Data Tx Pin 2 Pin 8Signal Ground Pin 5 Pin 5All other pins on the COM 1 port must be left un-connected for proper operation.Serial SettingsThe GPS device must be configured to transmit data with the following serial settings:4800 Baud, 8 data bits, no parity, 1 stop bitProtocol SupportThe GER1500 accepts NMEA V1.5 and V2.1 format data sentences. The following NMEAsentence types are received and interpreted:GPGLLGPGGAAll other NMEA sentences are ignored.Examples of acceptable GPGLL and GPGGA sentences:$GPGLL,4140.67,N,07351.27,W$GPGLL,4140.6694,N,07351.2658,W,184904.117,A*24$GPGGA,202826,4146.5358,N,07341.8315,W,1,05,02.0,+00137,M,,M,,,*6BNote that NMEA V2.1 is the preferred data format, since some V1.5 data sources havelower resolution on the latitude/longitude fields, and may not contain a time field.GER 1500 USER MANUAL, REVISION 3.7