Specifications

Chapter 4 – Serial Interface Control Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 66
4.5 AT\Q Flow Control
Syntax: Exec Command: AT\Q[<n>]
Responses: OK
If RTS/CTS flow control is not supported by interface and <n> is 2 or 3:
ERROR
Parameter:
<n>
0 Disable flow control. Default (This is the default value if the parameter is
omitted. It is also the factory default value and can be restored to 0 with AT&F)
1 XON/XOFF software flow control
2 Only CTS by DCE (TA)
3 RTS/CTS hardware flow control
Recommended for the following procedures: incoming or outgoing data calls.
The value can be stored with AT&W.
The value can be displayed with AT&V.
Notes:
When using XON/XOFF flow control (AT\Q1) in online mode, +++ should not be used while the data
transmission is paused with XOFF. Before entering the command mode with +++ the paused transmission
should be resumed using the XON character.
With AT+IFC, flow control can be set separately for each data direction, while AT\Q applies to both
directions.
The two commands influence each other, i.e. settings made with AT\Q apply to AT+IFC and, vice versa,
AT+IFC changes the AT\Q setting.
This command is not PIN protected.
This command is supported in airplane mode.