Campbell Scientific 9522B Iridium Satellite Modem and COM9522B Interface Modem - Manual (Page 29)

9522B Iridium Satellite Modem and COM9522B Interface Modem
7. Troubleshooting Tools and Tips
Problem: I have intermittent successful connections between the remote and
base station modem. The signal strength is weak and the data transfer speeds
are slow.
Solution: The antenna may not have a complete 180° view of the sky. Some
objects and debris such as snow and trees can interfere with communications.
Make sure there are no obstructions to the antennas when installing. You may
need to reposition or elevate your antenna to obtain the best reception.
The Signal Quality AT command can be used to confirm signal strength during
installation/repositioning of the antenna. This will require use of a laptop
connected to the COM9522B interface and a terminal emulator. Once the
terminal emulator is connected, the following command can be entered to
check signal strength:
AT+CSQ
The modem should return a value of between 0 and 5 within 10 seconds.
Attempt to get the largest value during your installation/repositioning.
Problem: LoggerNet immediately brings back an error message saying that
communications with the station have failed.
Solution: Sometimes PakBus© beacons sent to other stations by LoggerNet
interfere with successful communications using Iridium Satellite Modems.
Either turn PakBus© beaconing off or disable communications with your other
stations when you attempt to download using Iridium. This can be
accomplished in the Setup screen in LoggerNet. Finally, restart LoggerNet to
clear the communications queue of any tasks.
Problem: LoggerNet makes several attempts to connect to the remote station
with no success. The failure is not immediate and the LoggerNet LogTool may
show a “No Carrier Detected” error.
Solution: It is possible that the base modem has lost its configuration. Resend
the configuration as shown in Section 3.2, Setup of Iridium Modems, and
attempt communications again.
Problem: I am using Iridium to communicate through the CS I/O port on my
datalogger. Whenever I try connecting with the datalogger, LoggerNet reports
that communication with the station has failed. This message takes several
seconds to appear.
Solution: You may have connected your SC932A device backwards at the
remote station. When you install the SC932A, it is imperative to make sure
that the device is connected in the proper way. Follow the label on the device
for the proper connections.
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