Do the Sun serial ports support RTS/CTS flow control?
The serial port hardware can do CTS-based control of the flow of data *from* the Sun *out* the serial port automatically. The tty driver option for that is the CRTSCTS option; it can be specified in: the “printcap” “ms” capability for a printer; in the “gettytab” “ms”, “m0”, “m1”, or “m2” capabilities for a dial-in port; the “STTY=” option for a dial-out line for UUCP or “cu” [check the UUCP documentation for details]; and can be specified with the “hf” capability in “/etc/remote” for “tip”. The hardware cannot directly do RTS-based control of the flow of data *into* the Sun, and the software does not currently support controlling the flow of data into the Sun with RTS. NOTE: the EEPROM options in newer Suns do not affect the flow control performed by the OS; in fact, the OS ignores the “ttya-mode”, “ttyb-mode”, “ttya-rts-dtr-off”, and “ttyb-rts-dtr-off” EEPROM options entirely. You don’t need to set them to change the way the OS handles the tty, and even if you do set them, it won’t c
