
Chapter 10 – V24-V25 Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands (PN S000294J)
59
DTE-DCE Local Flow Control +IFC
Description:
This command is used to specify the module DATA port flow control method. The factory default value is
2,2. The AT&F command restores the value that was active when the last AT&W command was used.
Values:
<Tx>
0
None
Transmit data flow control disabled.
1
XON/XOFF
Remove Xon (0x19) and Xoff (0x17) characters from data stream.
2
Hardware
Use RTS (Request To Send) signal (default)
3
XON/XOFF
Leave Xon (0x19) and Xoff (0x17) characters in data stream.
<Rx>
0
None
Receive data flow control disabled.
1
XON/XOFF
Remove Xon (0x19) and Xoff (0x17) characters from data stream.
2
Hardware
Use CTS (Clear To Send) signal (default)
Syntax:
Command syntax:
AT+IFC=<Tx>,<Rx>
Command
Possible Responses
AT+IFC=?
Note: Display valid parameter ranges.
+IFC: (0-3),(0-2)
OK
Note: Valid parameter ranges
AT+IFC?
Note: Display current settings.
+IFC: 2,2
OK
Note: Default values are 2,2 (hardware flow control).
AT+IFC=3
Note: Set Tx flow control to XON/XOFF.
OK
Note: New Tx flow control value set.
AT+IFC=,1
Note: Set Rx flow control to XON/XOFF.
OK
Note: New Rx flow control value set.
AT+IFC?
Note: Display current settings.
+IFC: 3,1
OK
Note: Settings displayed.
AT+IFC=2,2
Note: Set Tx and Rx flow control to
hardware.
OK
Note: New Tx and Rx flow control values set.
Set DCD Signal &C
Description:
This command is used to specify the behavior of the Data Carrier Detect (DCD) signal on the module DATA
port. The factory default value is 2. The AT&F command restores the value that was active when the last
AT&W command was used.
Values:
<
n
>
0
The DCD signal is always asserted.
1
The DCD signal is asserted in a call and de-asserted when not in a call.
Default is 1
2
The DCD signal is always asserted except at the end of a call. At the end of a call, the DCD signal is
de-asserted for 1 second.
Syntax:
Command syntax:
AT&C<n>
Command
Possible Responses
AT&C0
Note: DCD always on
OK
Note: Command valid
AT&C1
Note: DCD matches the true state of the call.
OK
Note: Command valid
AT&C2
Note: Wink DCD signal on call disconnect
OK
Note: Command valid