SARA-R4/N4 series-AT Commands Manual
UBX-17003787 - R09
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10V24 control and V25ter
Page 100 of 307
10.7.3î™–î™–î™–î™–Defined values
Parameter Type Description
<DCE_by_DTE> Number
• 0: none
• 1: DC1/DC3 on circuit 103 (XON/XOFF)
• 2 (default and the factory-programmed value): circuit 105 (RTS)
<DTE_by_DCE> Number
• 0: none
• 1: DC1/DC3 on circuit 104 (XON/XOFF)
• 2 (default and the factory-programmed value): circuit 106 (CTS)
10.7.4î™–î™–î™–î™–Notes
• <DCE_by_DTE> and <DTE_by_DCE> parameters must be provided with the same value in pairs (only (0,
0), (1,1) and (2,2) are allowed. The other combinations are not allowed and the "+CME ERROR: operation
not allowed" error result code is returned).
10.8î™–î™–î™–î™–Set flow control \Q
\Q
SARA-R404M SARA-R410M-01B SARA-R410M-02B SARA-R410M-52B SARA-R412MModules
SARA-N4
Syntax PIN required Settings saved Can be aborted Response time Error referenceAttributes
full No No No - +CME Error
10.8.1î™–î™–î™–î™–Description
Controls the operation of the local flow control between DTE and DCE. It is used when the data are sent or
received.
The SW flow control (XON/XOFF) activation is only allowed in case of the text transmission: the binary data
cannot be transmitted because it may contain the special flow control characters (XON/XOFF). For the SW
flow control enhancement, allowing its usage during a PSD call with PPP L2 protocol, see the SW flow control
enhancement for PSD data transfer with PPP L2 protocol in the AT&K command description.
When the software flow control (XON/XOFF) is used, the DC1 (XON, 0x11) and DC3 (XOFF, 0x13) characters are
reserved and therefore filtered (e.g. in SMS text mode these two characters can not be input).
Since the DTE-DCE communication relies on the correct reception of DC1/DC3 characters, the UART power
saving should be disabled on the module when SW flow control is used. If the UART power saving is active, the
DC1/DC3 characters could be used to wake up the module's UART, and therefore lost. In case a DC3 character
(XOFF) is correctly received by module's UART and some data is waiting to be transmitted, the module is forced
to stay awake until a subsequent DC1 character (XON) is received.
The software flow control (XON/XOFF) setting is not allowed on the USB interfaces, on the SPI interface
and on a multiplexer channel. See the Multiple AT command interfaces for all the behavior differences in
respect to the supported interfaces.
10.8.2î™–î™–î™–î™–Syntax
Type Syntax Response Example
Set AT\Q[<value>] OK AT\Q3
OK
10.8.3î™–î™–î™–î™–Defined values
Parameter Type Description
<value> Number
• 0: no flow control
• 1: DC1/DC3 on circuit 103 and 104 (XON/XOFF)
• 3 (default value): DCE_by_DTE on circuit 105 (RTS) and DTE_by_DCE on circuit 10
6 (CTS)
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