Technical data

WMO2 G900 / G1800 / G1900

WCOM/GSM/WMO2/WMO2ATDOC Friday 21 May 1999

WAVECOM confidential © 71

4.9.3 DTE-DCE local flow control +IFC

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

Application to GSM AT+IFC=?

GSM to application +IFC: (2),(2)

possible values.

Application to GSM AT+IFC=0,0

GSM to application OK new values

4.9.4 Set DCD signal &C

This commands controls the Data Carrier Detect (DCD) signal.

Application to GSM AT&C0 DCD always on