EC0N@TE.CC.CMU.EDU (Eric R. Crane) (10/14/85)
I am running a Vax 750 with a single DZ11 attatched to a Micom Port Selector. We want the system to be set up such that when a user logs out the driver drops the line and the user is returned to the Micom. When we had the lines set as dialups everything would work fine except for once a tty was disconnected it would not respond to a ring, we could connect 8 times and then no more. I noticed an option in vaxif/dz.c of something like PORTSELECTOR. Are any of you familiar with this or know if it might solve my problem? - Eri R. Crane Carnegie-Mellon University Computation Center Eric.Crane@CMU-CC-TE.ARPA -------
piet@mcvax.UUCP (Piet Beertema) (10/18/85)
>I am running a Vax 750 with a single DZ11 attatched to a Micom Port Selector. >We want the system to be set up such that when a user logs out the driver >drops the line and the user is returned to the Micom. When we had the lines >set as dialups everything would work fine except for once a tty was >disconnected it would not respond to a ring, we could connect 8 times and >then no more. >I noticed an option in vaxif/dz.c of something like PORTSELECTOR. Are any >of you familiar with this or know if it might solve my problem? Port type 9 (dialup) is slow and is put out of service too frequently; we use only port type 8 (DTR). It requires two things: 1. By default HUPCL must be set, so upon close DTR to the Micom is dropped; 2. The Micom requires (on both port types) DTR to stay low for a while (very short actually, something like 200nsec seems enough, so a small capacitor allows you to connect up e.g. lineprinters to the same port type...); all you need to do is to keep DTR low in the dzclose() routine: after dropping DTR sleep e.g. .5 sec.: { extern int wakeup(); (void) dzmctl(dev, DZ_OFF, DMSET); /* Hold DTR low for 0.5 seconds */ timeout(wakeup, (caddr_t) &tp->t_dev, hz/2); sleep((caddr_t) &tp->t_dev, PZERO); } -- Piet Beertema, CWI, Amsterdam (piet@mcvax.UUCP)