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Getting Started
Receiving "ERROR"
7.2.
The USR3500 returns an "ERROR" message (in reply to an AT command) in the
following cases:
The AT command syntax is incorrect. In this case, check the command syntax
(refer to the AT Commands Interface Guide at http://www.usr.com/support/3500).
The AT command syntax is correct, but was transmitted using the wrong
parameters
Enable the verbose error report method to see the error codes associated with the
command syntax.
Enter the AT+CMEE=1 command in order to change the error report method to
the verbose method, which includes the error codes.
Re-enter the AT command which previously caused the reception of an "ERROR"
message in order to get the Mobile Equipment error code.
When the verbose error report method is enabled, the response of the USR3500 in
case of error is either:
+CME ERROR: <error result code>
or
+CMS ERROR: <error result code>
Refer to the AT Commands Interface Guide at
more information on the error result code description and further details on the
AT+CMEE command.
Caution:
It is strongly recommended to always enable the verbose error report method to get the Mobile
Equipment error code (enter the AT +CMEE=1 command).
Receiving "NO CARRIER"
7.3.
If the USR3500 returns a "NO CARRIER" message upon an attempted call (voice or
data), refer to the following table for possible causes and their corresponding solutions.
Rev 1.1
Troubleshooting the USR3500
http://www.usr.com/support/3500
9/22/14
for
37
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