Westermo GDW-11 - Manual (Page 163)

V.24-V.25 commands 163 6615-2220
+IFC – DTE-DCE local flow control
Description:
This command is used to control the operation of local flow control between the DTE
and DCE.
Syntax:
AT+IFC=<DCE_by_DTE>,<DTE_by_DCE>
Parameters:
<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)
NOTE:
When this parameter is set to 2 (DTE invokes flow control through RTS) DCE behavior
is as follows:
If the DCE has never detected RTS in the high (or ON) condition since startup, then it
ignores RTS (assuming this signal is not connected).
As soon as the DCE detects RTS high the signal acts on it. Therefore subsequent RTS
transition to OFF will prevent the DCE from sending any further data in both online and
offline modes.
This behavior allows the user to use the default settings (hardware flow control) and
leave RTS disconnected. In the case where RTS is connected and is high at least once, it
acts on the 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.
Command example Possible responses Note
AT+IFC? +IFC: 2,2 Current values
OK
AT+IFC=? +IFC: (0,2),(0,2) Possible values
OK
AT+IFC=0,0 OK New values, No flow
control