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Chapter 12 – V.24 and V.25 Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 104
Auto-Tests &T
Description: This command runs various auto-tests.
Values: <n>
0 Perform software auto-tests
The response will be OK if no software problem is detected (EEPROM, RAM, and ROM
checksums); otherwise, a simple ERROR response is sent.
1 Perform the audio loop test (close)
This is used to validate the audio loop (microphone to speaker)
2 Stop the audio loop test (open)
This is used to validate the audio loop (microphone to speaker)
Syntax: Command syntax: AT&T<n>
Command Possible responses
AT&T0
Note: Perform software auto-tests
OK
Note: No software problem detected, all checksums are
correct
AT&T1
Note: Do the audio loop test (close)
OK
Note: Command valid
AT&T2
Note: Stop the audio loop test (open)
OK
Note: Command valid
Echo E
Description: This command is used to determine whether or not the modem echoes characters received by an
external application (DTE).
Values: <n>
0 Characters are not echoed
1 Characters are echoed
Syntax: Command syntax: ATE<n>
Command Possible responses
ATE0
Note: Characters are not echoed
OK
Note: Done
ATE1
Note: Characters are echoed
OK
Note: Done
Restore Factory Settings &F
Description: This command is used to restore the factory settings from EEPROM.
It only restores the parameters that can be found in the Parameters Storage table with column AT&F
checked. Those parameters are restored in RAM and in E2P, overwriting the profile set with AT&W.
Values: <n>
0 Restore factory settings
Note: No other value is supported.
Syntax: Command syntax: AT&F<n>
Command Possible responses
AT&F
Note: Ask for restoring the factory settings
OK
Note: Done
AT&F0
Note: Ask for restoring the factory settings
OK
Note: Done