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From: rjn@hpfcso.FC.HP.COM (Bob Niland)
Newsgroups: comp.sys.hp
Subject: Re: Hardware handshaking on the built-in serial port on a 400s?
Message-ID: <7370352@hpfcso.FC.HP.COM>
Date: 30 Mar 91 17:39:18 GMT
References: <1991Mar27.230741.5778@fwhnm02.fwrdc.rtsg.mot.com>
Organization: Hewlett-Packard/FSY Ft.Collins,CO,USA
Lines: 25

re: > I have set up uucp on an 400s (50 MHz '030 version) computer system
    > running HP-UX 7.03.  I have connected a Telebit T2500 via the built in
    > serial port (select code = 9).

> I have noticed that when using cu to the modem and asking for the register
> set (for example), that at times characters are dropped.  My immediate
> solution was to turn on XON/XOFF handshaking.  The problem is, this
> doesn't work well with my uucp feed.

You need to turn on the 16 byte FIFO and maybe CTS/RTS flow control on port
9.  Prior to release 7.05 (i.e., in 7.0 or 7.03) you need a patch.  At 7.05,
the patch (shar) is still useful because of the documentation it provides.

> If so, what can I do about it?  Is there a special driver or a specific
> method of setting up the device special file (other than specifying a
> modem connection) to resolve this problem?  I have heard (through the
> grapevine ;-) that release 7.05 will resolve this problem.  Is THIS true?

Request a copy of the "Centronics/Serial" patch from your local HP support
rep.  If they don't have it, have them contact me, as I am the supplier (it
is not on our normal field support patch system).

Regards,                                              Hewlett-Packard
Bob Niland      Internet: rjn@FC.HP.COM               3404 East Harmony Road
                UUCP: [hplabs|hpfcse]!hpfcrjn!rjn     Ft Collins CO 80525-9599