Specifications

TC35i AT Command Set
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TC35i_ATC_V01.05 Page 50 of 278 04.08.2003
2.45 AT+IFC Set Flow Control separately for data directions
The command AT+IFC can be used to set or query the type of flow control separately for each data
direction.
Test command
AT+IFC=?
The Test command returns the values of the supported methods of flow control.
Response
+IFC: (list of supported <TEflowcontrol>s), (list of supported <TAflowcontrol>s)
OK
Parameter
See write command
Read command
AT+IFC?
The Read command returns the currently selected method of flow control.
Response
+IFC: <TEflowcontrol>, <TAflowcontrol> OK
Parameter
See write command
Write command
AT+IFC=
<TEflowcontrol>,
<TAflowcontrol>
The parameter setting determines the data flow control on the serial interface.
Response
OK
ERROR
Parameter
<TEflowcontrol> (numeric)
Specifies the method that will be used by the TE when data is re-
ceived from the TA.
[0] none
1 XON/XOFF. Terminate flow control in the cellular engine.
2 RTS line
3 XON/XOFF. Evaluate flow control in the cellular engine and
pass it through (over the air) to the opposite TE.
<TAflowcontrol> (numeric)
Specifies the method that will be used by the TA when data is re-
ceived from the TE.
[0] none
1 XON/XOFF
2 CTS line
Reference
V.25ter
Note
· The setting of AT+IFC is stored volatile. For use after restart it should be
stored to the user defined profile (AT&W).
· The type of flow control set with AT\Qn is valid in both data directions. See
Chapter 2.3.
· When using XON/XOFF flow control ( AT+IFC =1,x or AT+IFC =3,x) in data
mode, +++ should not be used while the data transmission is paused with
XOFF. Before entering the command mode with +++ the paused transmis-
sion should be resumed using the XON character.