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Part 1 – AT Commands for All Universal IP Devices Chapter 1 – General AT Commands for All Universal IP Devices
Universal IP AT Commands Reference Guide (Document S000457K) 11
Z – Default Configuration
Description: This command restores the configuration profile from NVM. Settings are recalled on power up.
Syntax: ATZ
Response: OK (Command valid)
&C – RLSD (DCD) Option Turn On or Off
Description: The modem controls the RLSD output in accordance with the parameter supplied. This
command sets the DCD On or Off.
Syntax: AT&C[<value>]
AT&C? Read or show the current value.
Values: 0 – Sets DCD to remain On at all times.
1 – Sets DCD to follow the physical connection.
2 – DCD follows the state of the TCP/UDP connection.
Default: 1
Response: OK
Otherwise ERROR
&D – DTR Option
Description: The modem reads the DTR to determine if the Data Terminal is Ready. This command allows the
modem to act on the DTR.
Syntax: AT&D[<value>]
AT&D? Read or show the current value.
Values: 0 – DTR is ignored (AT&D with no parameter).
1 – An Active to Inactive transition disconnects an active TCP/UDP connection
2 – (For Non-MT100SEM) An active to inactive transition disconnects the physical connection
Default: 0
Response: OK
Otherwise ERROR
&F – Reset Factory Defaults
Description: For MT100SEM: This command replaces all settings with the factory defaults but does not store
them to memory. Use &W to store them to the memory.
For NON-MT100SEM: This command replaces the factory defaults of &D, &S, &C, E, and V only.
Note: The module must be RESET to put this command into effect.
Syntax: AT&F
Values: None/No parameters
&S – DSR ON or OFF
Description: This command sets the DSR to ON of OFF.
Syntax: AT&S[<value>]
AT&S? Read or show the current value.
Values: 0 – Sets DSR to remain ON at all times
1 – Sets DSR to follow DCD
2 – DSR follows the state of the TCP/UDP connection
Default: 1
Response: OK
Otherwise ERROR