Xylem Ai1 Product Manual page 85

a. Listen for Windows notifications when a USB device is connected or
disconnected when connecting through USB. This may indicate
power problems, datalogger resets or remote program changes. Use
Windows Device Manager to confirm the port allocated to the CR300
(COM3 in the example here)
b. If the datalogger fails to connect, yet gives the USB connection sound
when plugging in, it may be busy performing another process. For
particularly difficult connections, consider using a terminal program
and pressing enter to return the CR300> prompt.
c. If the datalogger is slow or unresponsive the USB cable may need to be unplugged and re-seated
d. If the datalogger is not recognized by Windows, it may be a corruption of the datalogger. The
hardware may still be operational. Contact support for instructions on booting logger into Safe
Mode (prevents program running).
5. Cellular Connection Problems:
a. If the program is running, but a connection is not established to PBRouter or other services, make
sure that the communication parameters are correct. Particularly the SIM card information. The
Access Point Name (APN) must match the SIM card service provider. The settings vary depending
on your service provider. For a Global SIM card issued from the factory the APN is super or
wireless.twilio.com depending on the model (refer to the shipping documentation, or the currently
running program). For other locally sourced SIM cards, refer to your provider for further
information. Find this line in your program to edit the APN:
b. The Ai1 provides extensive diagnostic information regarding the cellular service and internet
connection. View Deployment \ Cellular to see the status information including APN, power on, SIM
card messages, signal strength and registration status.
c. Signal Strength. Specifies the signal strength of the modem in -dBm, with RSRP for systems using 4G
or RSSI for systems using 3G. Note that the signal strength is highly rotation dependant due to the
orientation of the antenna. To estimate signal strength at your site, with various service providers,
the free service
Excellent
d. For complex cellular problems, from terminal mode, use "SHOW CELLULAR ERRORS" and "SHOW
CELLULAR LOG" to see the list of errors. "SHOW CELLULAR INFO" also provides detailed information.
If the error is related to IP stack errors, "SHOW IP MEM" should be used.
Page | 85
www.cellmapper.net is recommended.
4G. Reference Signal Received Power (RSRP)
-90dBm
Good
-70dBm
3G. Received Signal Strength Indicator (RSSI)
-105dBm
Fair
-85dBm
-115dBm
Poor
-100dBm