A Appendix A
Flow
Should match the flow control set in the device you are communicating with.
Parity
Should match the parity set in the device you are communicating with.
Stop bit
Should match the stop bit set in the device you are communicating with.
NMEA Msg
This section allows you to control which NMEA messages are output by your unit’s GPS receiver and
the rate at which they are output.
The GGA NMEA message is automatically enabled by default and cannot be disabled. You may
change the frequency of output for the GGA NMEA message, but you may not disable it.
Other NMEA messages listed may be disabled as well as changing the frequency of output. The
ability to change the frequency of output and to disable certain messages is useful when
communicating at a very low baud rate to prioritize which NMEA messages are sent. Each field
allows you to select a value from one to five (measured in seconds), or to select OFF.
For example, selecting 3 instructs the receiver to output the corresponding NMEA message once
every three seconds. Selecting OFF instructs the receiver to never output the corresponding
message. This setting is only applicable when you need to specify your unit’s GPS receiver to send
out very specific NMEA messages at specific times for your GPS application. Most users will not need
to change this, as the default NMEA settings will work for most GPS applications trying to display
common GPS information (e.g. position, velocity, direction).
DGPS tab
Differential GPS (DGPS) positioning involves subtracting a combination of ranges measured to
various satellites from two or more receivers measuring the same satellites simultaneously. When
the signals are subtracted, the major error sources cancel each other out.
Ranger Series Handheld Computer 69
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