85
Figure 38. NAVconfig serial 1 output properties window
Note: NMEA tab only appears when NMEA is selected from the Packet drop-down list.
Select the message type to output from the Packet drop-down list and select the baud
rate and data rate to output at. Table 33 gives details of the different messages.
Table 33. Serial output options
Option Description
Disabled The serial output is disabled. This option can be used to reduce the computational
load and ensure that the Kalman filter runs quicker.
NCOM
Normal output of the RT. NCOM data is transmitted at up to 100 Hz or 125 Hz
(for 250 Hz systems; RS232 does not support 250 Hz). The format is described in
the NCOM Description Manual. Software drivers exist for decoding the NCOM
data.
IPAQ NCOM output at a reduced rate. The baud rate of the serial port is set to 19200
and the update rate is 25 Hz. It is used because the IPAQ cannot manage to
receive the data reliably above 25 Hz.
IPAQ+ NCOM output at a reduced rate and polled. Windows Mobile 5 on IPAQs crashes
if the RT is sending data when the IPAQ is turned on. Using IPAQ+ the IPAQ
will poll the RT; the RT will not send data while the IPAQ is off, preventing the
turn-on crash of the IPAQ.
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