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6.
Diagnosing Modem Responses
. If the messages available in the Deployment \ Cellular tab do not help solve
it, real-time terminal messages from the modem may be viewed. From the
CR300>
prompt in terminal
mode, type
SET COMMS WATCH
and then select option 12 for the cellular modem. Modem commands will
scroll up the screen. The screenshot here shows the typical sequence for a good modem connection. The
datalogger will query the modem with AT+CREG? to check the network registration. The typical responses
are:
•
0,0 (Not registered, not currently searching)
•
0,1 (Registered on the home country network)
•
0,2 (Not registered, Searching for Operator)
•
0,3 (Registration Denied)
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•
0,4 (Unknown error, such as out of coverage)
•
0,5 (Registered on a roaming network)
Next it will query the network operator (AT+COPS?)
with the response of the network operator name (in
this case Telstra) and the Access Technology (in this
case 2 = UTRAN). and the signal strength
(AT+CSQ?).
7.
Capture Modem Responses
. Capturing the modem
responses allows them to be emailed to support for
further diagnosis. To capture, click
Start Export
while watching the diagnostics. Once started
Bytes
Received
will update as responses are captured.
Continue to let the responses run for enough time to
capture the portion of interest, and then click the
End Export
button
8.
Ai1 Data Table
. The Ai1 records important diagnostic details every SLOW_MEASUREMENT_INTERVAL
(typically every 15 to 60 minutes). This includes information such as battery voltage, temperature, enclosure
humidity, current, program signature, program counter, error codes, memory pointers, cell data and GPS
information. Changes in diagnostic information can indicate when an error was introduced and should be
referred to.
9.
If the GPS continuously responds with $PGACK, $PMTK011 and $PMTK010 then it is most likely resetting due
to power supply issues. Confirm that the voltage is a consistent 3.3V. Anything less than 3V and the GPS will
reset.
10.
If you need a terminal program, DevConfig can be used. Select “Unknown Device” from the device list, set
the Baud rate and open the COM port.
11.
If a problem is occurring reading a YSI sonde with the RS485 adapter, it is likely that the RS232 to RS485
adapter is not powered with 5V. The tell-tale sign is that the start-up message from the instrument does not
always contain the 7E byte to start, but rather
something like “
01 00 00 71 61 99 3A C0 00 00 00 00 00 16
D3
”
. The screenshot below is an example of successful communications:
35
Registration Denied typically relates to a SIM card that has not been activated. Registered on a roaming network is the standard response for a Global SIM.
Figure 43 - Successful communications, starting with 7E and mainly
00’s. If a lot of bytes are FF the RS485+/
- wiring may be reversed
