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650 MDS Section 3
YSI Environmental Monitoring Systems Operations Manual 3-53
3.8 USING GPS WITH THE 650
3.8.1 SETTING UP THE GPS-650 INTERFACE
The 650 allows the user to display GPS readings of latitude and longitude from a commercially-available,
user-supplied unit in the Status Bar of the 650 display. The interface of the GPS unit to the 650 is
accomplished via the 6115 GPS cable that can be purchased as an optional accessory. Using the 6115 cable,
GPS readings can also be logged to the 650 memory along with sonde sensor readings taken at a particular
geographical location, which can then be relocated for subsequent studies.
The use of the GPS interface is easy, but the user must configure the hardware and software of the GPS unit as
follows before proceeding:
 Consult the user manual of the GPS unit and configure the instrument so that readings in the NMEA 0183
protocol are generated.
 Purchase from your GPS manufacturer a cable that connects at one end to the GPS unit and has at its
other end a female DB-9 connector for interface with the YSI 6115 GPS cable.
Once these requirements are met, proceed according to the following instructions, consulting Figure 2 in
Section 3.2.3 above for assistance:
 Connect the 6115 GPS cable to the 650 via the MS-8 connector.
 Connect the other MS-8 connector of the 6115 GPS cable to the MS-8 connector or your sonde cable.
 Attach the male DB-9 connector of the 6115 GPS cable to the mating female connector of your GPS unit.
 Turn on the 650 and make certain that appropriate GPS readings are displayed in the upper left corner of
the Status Bar as shown in the following display.
3.8.2 LOGGING GPS READINGS
To log latitude and longitude readings from a user-supplied GPS unit, the following conditions must be
met:
 GPS readings can ONLY be logged to 650 memory – the system does NOT support logging to sonde
memory.