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4 Restoring Default Configuration
4.1 Serial Settings
In some situations it is necessary to restore all settings to their default values. Default values for
all settings are listed in the AT Command Reference chapter. The default values of the most im-
portant settings are:
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Serial settings: 57600 baud, 8 data bits, no parity, 1 stop bit, hardware flow control.
Serial interface type: RS232.
AT escape sequence: “///” (three forward slashes).
Escape sequence timing: 1 second of no data transmission required before and after
the escape sequence for the escape sequence to be valid.
S2: ‘/’ ASCII value of 47
S3: ASCII value of 13
S4: ASCII value of 10
S5: ASCII value of 8
The default settings can be restored in two ways.
One way is to apply a logic low signal on the Switch-1 input on the module during startup. If
the module is mounted on a Module Adapter, this is done in the following way:
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Disconnect power from the Module Adapter.
Press and hold the default settings button input (the one closest to the RS232 connec-
tor).
Connect power to the Module Adapter.
When the module powers up, all settings will be restored to their default values.
The other way is to enter AT mode on the module and use the AT command AT&F Restore to
Factory Settings.
A second alternative to restore UART settings is to enable UART fallback mode (ATS4014=1).
Firmware will check switch-0 every second when UART fallback mode is enabled. If switch-0 is
pressed/activated UART settings are temporarily changed to 57600 baud, 8n1, and hardware
flow control. Settings are restored when button is released.
Version 1.6.6 - 2009-11
12
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