You can also use the pseudo-send STTY=value string to set modem characteristics. For instance, STTY=crtscts enables hardware flow control. STTY accepts all stty modes. See the stty (1) and termio (7I) man pages for complete details.
The following example enables hardware flow control in a Systems file entry:
unix Any ACU 2400 12015551212 "" \r ogin: Puucp ssword:Passuan "" \ STTY=crtscts
This pseudo-send string can also be used in entries in the Dialers file.