Agilent Technologies E7474A Getting Started Manual page 153

Solving Problems and Updating Your System
Troubleshooting Resource, GPS, or, COM Errors Problems
settings and tape the list to the unit. The primary cause of COM errors
between the PC and the GPS receiver is usually incorrect port settings.
The following procedure is suggested for locating and eliminating GPS errors
and problems when using the Agilent Wireless Solutions system.
Do This
1 Check hardware connections (verify cabling
and power supply).
2 Start the Agilent Wireless Solutions Software,
select your project, select Collection mode,
and note what error messages occur.
Agilent Wireless Solutions
Additional Information
If you have hardware configuration errors and/or
communications errors, exit the Agilent Wireless
Solutions Software. Cycle the power on the GPS
receiver and the Agilent E645x receiver, then
check both RS-232 connections and DC
connections. Run the Agilent Wireless Solutions
Software again.
If there are no error messages, the hardware
connections are OK. Skip to step 3.
If there are error messages, write them down
and review the entire Troubleshooting section. If
you are unable to resolve the error messages,
refer to "Calling for Assistance" on page
There are three main messages when something
is wrong:
• Hardware Error
• Application Error
• Communications Error
If there is an application error, it is likely that the
GPS receiver configuration in the Hardware
Editor of the configuration is different than the
actual settings of the Trimble GPS receiver.
A common error is "Application Error: Failed to
read serial device. Please make sure the
hardware configuration is correct and the
hardware is connected and turned on. Device =
COM 1".
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