tt@euler.jyu.fi (Tapani Tarvainen) (05/21/91)
Does anyone know how high speeds the built-in RS232 interface fo a HP9000/345 can handle? At least it seems to work at 38400 baud; can it do more? What magic incantations would it take? (stty won't set speeds higher than 38.4k, and kermit's limit seems to be 19200 :-( ) What about a 425? -- Tapani Tarvainen (tarvaine@jyu.fi, tarvainen@finjyu.bitnet)
rjn@hpfcso.FC.HP.COM (Bob Niland) (05/24/91)
re: > tt@euler.jyu.fi (Tapani Tarvainen) writes... > > Does anyone know how high speeds the built-in RS232 interface fo a > HP9000/345 can handle? At least it seems to work at 38400 baud; can it do > more? What magic incantations would it take? (stty won't set speeds > higher than 38.4k, and kermit's limit seems to be 19200 :-( ) With the 7.05 driver, speeds up to ~400K may be declared, a 16-byte FIFO is enabled, and CTS/RTS hardware flow control is available. For 7.0 and 7.03, you need a patch shar, available from me via your local HP support person. Have them contact me if they don't have a copy. The shar is also useful for documentation at 7.05. > What about a 425? The higher speeds, FIFO and CTS/RTS flow control apply to the first (select code 9) serial port on all Model 400 machines including 425t, but excluding the new 425e. This type port, based on the Ns16550, has not been fully characterized at high speeds on a busy system. The other two ports (select codes 5 & 6) have the characteristics of the older Apollo DN-series ports; the 425e has only this type of port. Although this port has some buffer, it lacks CTS/RTS and has a fairly low max bps rate (perhaps 38,400). I have no further data on it. Regards, Hewlett-Packard Bob Niland Internet: rjn@FC.HP.COM 3404 East Harmony Road UUCP: [hplabs|hpfcse]!hpfcrjn!rjn Ft Collins CO 80525-9599