MC55_ATC_V04.00 Page 144 of 475 3/17/06
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7.17 +++ Switch from data mode to command mode
Syntax
Command Description
This command is only available during a CSD call or a GPRS connection. The +++ character sequence causes
the TA to cancel the data flow over the AT interface and switch to command mode. This allows you to enter AT
commands while maintaining the data connection to the remote device or, accordingly, the GPRS connection.
To prevent the +++ escape sequence from being misinterpreted as data, it must be preceded and followed by a
pause of at least 1000 ms. The +++ characters must be entered in quick succession, all within 1000 ms.
Notes
• To return from command mode to data or PPP online mode: Enter ATO.
• In Multiplex mode the +++ sequence does not work. Therefore, if required in Multiplex mode, the escape
sequence needs to be implemented in the customer's external Multiplex application. Design solutions, for
example using the DTR signal or a modem status command (MSC), can be found in [5], Section "Escape
Sequence". See also Section 4.8, AT+CMUX.
• On ASC1 the +++ sequence can be used in GPRS connections for switching from PPP online to command
mode.
Exec Command
+++
Response(s)
OK
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last
V.250 ! % § ! ! ! ! ! !
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