MNP and V.42

99

Flow control

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.