Hemisphere GPS Crescent V100 Series, Руководство пользователя

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Crescent V100 Series User Guide
37
Since RS-422 is a balanced signal with positive and negative
signals referenced to ground, ensure that you maintain the correct
polarity. For instance, when connecting the transmit data output
positive signal to the receive line of the other device, it should be
connected to the receive positive terminal. The negative transmit
data signal from the Crescent V100 is then connected to the
receive data negative input of the other device.
There is likely not much reason to connect the receive data input of
the Crescent V100 to another device unless it is able to send
configuration commands to the V100. Since the V100 uses
proprietary NMEA 0183 commands for control over its
configuration, the vast majority of electronics will not be able to
configure its settings unless the other device has a terminal setting
where you can manually issue commands.
Default Parameters
This section outlines the default parameters of the Crescent V100.
Table 1-6 to Table 1-11, on pages 38 to 41, provide details on the
firmware types, port settings, default NMEA messages, elevation
mask, differential age mask, default differential mode and beacon
receiver settings.
Note: Any changes you make to the Crescent V100
configuration need to be saved with the $JSAVE command
in order to be present for a subsequent power-cycle.