Dte-Dce Local Flow Control; Set Dcd Signal &C; Set Dtr Signal &D - Wavecom WMO2 Manual

WCOM/GSM/WMO2/WMO2ATDOC

4.9.3 DTE-DCE local flow control

Application to GSM
GSM to application
Application to GSM
GSM to application
Application to GSM
GSM to application
4.9.4 Set DCD signal &C
Application to GSM
GSM to application
Application to GSM
GSM to application
4.9.5 Set DTR signal &D
Application to GSM
GSM to application
Application to GSM
GSM to application
Application to GSM
GSM to application
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
1 Xon/Xoff local circuit 103
2 RTS
3 Xon/Xoff global on circuit 103
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
1 Xon/Xoff circuit 104
2 CTS
When this parameter is set to 0 (none) then CTS is kept high all the time.
AT+IFC?
+IFC: 2,2 current values
OK
AT+IFC=?
+IFC: (2),(2) possible values.
OK
AT+IFC=0,0
OK new values
This commands controls the Data Carrier Detect (DCD) signal.
AT&C0 DCD always on
OK command valid
AT&C1 DCD matches state of the remote modem's data carrier
OK command valid
This commands controls the Data Terminal Ready (DTR) signal.
AT&D0 the DTR signal is ignored
OK command valid
AT&D1 Modem switches from data to command mode when DTR
switches from ON to OFF
OK command valid
AT&D2 Upon DTR switch from ON to OFF, the call is cleardown
OK command valid
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WMO2 G900 / G1800 / G1900
+IFC
supported
not supported
supported
not supported
supported
not supported
Supported
Friday 21 May 1999
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