Westermo GS-01, Installation Manual

Page: 30 / 56

30 6195-2201
+IFC – DTE-DCE local flow control
This command is used to control the operation of local flow control between the DTE
and DCE.
AT+IFC=
<DCE_by_DTE>,<DTE_by_DCE>
* < DCE_by_DTE >:
0 none Supported
1 Xon/Xoff local circuit 103 Not supported
2 RTS Supported
3 Xon/Xoff global on circuit 103 Not supported
Important note: When this parameter is set to 2 (DTE invokes flow control through RTS)
the behavior of the DCE is the following:
If the DCE has never detected RTS in high (or ON) condition since
startup then it ignores RTS, assuming this signal is not connected.
As soon as DCE detects RTS high, then this signal acts upon it.
Therefore subsequent RTS transition to OFF will prevent DCE from
sending any further data in online and in offline as well.
This behavior allows the user to use the default settings (hardware flow
control) and let RTS disconnected. In the case RTS is connected and is
high at least once then it acts upon DCE.
< DTE_by_DCE >:
0 none Supported
1 Xon/Xoff circuit 104 Not supported
2 CTS Supported
When this parameter is set to 0 (none) then CTS is kept high all the time.
Application to GSM AT+IFC?
GSM to application +IFC: 2,2 Current values
OK
Application to GSM AT+IFC=?
GSM to application +IFC: (0,2),(0,2) Possible values
OK
Application to GSM AT+IFC=0,0
GSM to application OK New values