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MNP and V.42
Flow control
5.375 x 8.375 ver 2.4.0
Since these two codes, XON and XOFF, are used as flow
control characters, binary data that includes these two codes
cannot be transmitted or received.
CTS/RTS two-way flow control (hardware)
Flow control is performed by turning on and off the control
lines CTS (clear to send) and RTS (request to send) between
the modem and the computer. A transmission halt or restart
request is made from the modem to the computer using the
CTS signal.
A transmission halt or restart request is made from the
personal computer to the modem using the RTS signal.
Commands (\Qn, &Kn)
Select flow control between the modem and computer (serial
port) as follows:
❖ When CTS/RTS flow control is supported by the
communication software
\Q3, &K3 Communication in reliable mode or normal
mode
❖ When XON/OFF flow control is only supported by the
communication software
\Q1, &K4 Communication in reliable mode or normal
mode
For details, refer to “AT Commands” on page 51.