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Table Of Contents
SARA-R4 series-AT commands manual
UBX-17003787 - R16
14System features
Page 162 of 401
14.4.2RF test description
Sets the module in non-signalling (or test) mode, or returns to the signalling (or normal) mode.
In test/non-signalling mode, the module switches off the protocol stack for performing single tests which could
not be performed during signalling mode.
Improper usage of this command on a real network could disturb other users and the network itself.
When entering the test mode, it is possible to sequentially trigger the following actions for testing purposes
(also depending on the RATs supported by the module):
• 2G transmission of a GSM burst sequence on the desired channel and power level (only one time slot
configuration is available)
• 2G transmission of an 8-PSK modulation burst sequence on the desired channel and power level (only one
time slot configuration is available)
• 4G transmission of an LTE SC-FDMA OFDM signal (5 MHz bandwidth) in the desired channel in the FDD
band and power level
• 4G transmission of LTE SC-FDMA OFDM signal (5 MHz bandwidth) in the desired channel in TDD band and
power level
• Receiving signal detection and RF level measurement on the desired 2G or 4G (LTE) channel
• Receiving signal detection at diversity or secondary antenna input and RF level measurement on the desired
2G or 4G (LTE) channel
The command only accepts the parameter set supported by the specific module version. When an
unsupported parameter is issued, an error result code will be provided ("+CME ERROR: operation not
supported" or "+CME ERROR: 4" depending on the +CMEE AT command setting).
The execution of these actions is performed in non-signalling mode. In non-signalling mode:
• The module accepts some non-signaling related commands. Although it is recommended that only +UTEST
commands are used.
In normal mode:
• The only allowed +UTEST command is the AT+UTEST=1 used to enable the testing interface
• All other +UTEST commands return an error result code ("+CME ERROR: operation not allowed" or "+CME
ERROR: 3" depending on the +CMEE AT command setting)
The module must not be registered with the network (+COPS: 2) before entering the non-signalling mode,
otherwise an error result code ("+CME ERROR: operation not allowed" or "+CME ERROR: 3" depending on
the +CMEE AT command setting) is provided.
The +CMEE command can only be set in normal mode.
To return to the normal mode, perform one of these actions:
• issue AT+UTEST=0 and then reboot (by means of AT+CFUN=15) or power off the module.
• reset or power off the module. After the module reboot or at the next power on, issue an AT+CFUN=0 / AT
+CFUN=1 cycle.
• reset or power off the module. After the module reboot or at the next power on, issue the AT+UTEST?
command.
When the module returns the normal mode, the network registration status stored in the profile will be
restored.
See the SARA-R4 series application development guide [177] for further test command examples and
more information on module reboot.
14.4.3Syntax
Type Syntax Response Example
Generic syntax
Set AT+UTEST=<mode>[,[<param_
val1>][,[<param_val2>][,[<param_
val3>][,[<param_val4>][,[<param_
val5>]]]]]]
[+UTEST: [<param_val1>,<param_
val2>][,<param_val3>][,<param_
val4>,<param_val5>][,<min>,<avg>,
<max>]]
OK
AT+UTEST=0
OK