flow

The flow command tells Autolog which hardware (or software) signal to use for flow control, which is used as a signal between the modem and your computer to indicate when it is okay to accept or send incoming or outgoing data. flow in specifies flow control for incoming data, and flow out specifies flow control for outgoing data. Use flow after you've used link to specify which communications port you'll be using.

Note It is strongly recommended that you use hardware (port, modem, and modem cable) that supports hardware flow control for the best performance. Most file transfer protocols (XMODEM, YMODEM, ZMODEM, SMT) will not work with software flow control.

If you are using a recommended modem cable that supplies hardware flow control connections, use the commands:
 

flow in rts
and
flow out cts

to use the RTS and CTS connections for hardware flow control.

Other options for the flow in command are dtr, xon, or off. dtr uses a nonstandard connection (the DTR connection) for incoming flow control. xon enables XON/XOFF (or software rather than hardware) flow control and is not recommended. off turns incoming flow control off.

Similarly, other options for the flow out command are dsr, xon, and off.