brook@ut-emx.UUCP (Brook Milligan) (02/24/90)
I am trying to connect the modem port of a DS3100 (Ultrix v3.1/UWS v2.1) to a hardwired serial line for uucp/tip use via a Micom linedriver. At this point all I can get when I `tip micom' is the message `connected (/dev/ttyd0)' followed by nothing. The linedriver and serial line work fine with a PC so I suspect either my cable connection to the linedriver or my /etc/remote file or ... Has anyone done this or something similar? Can you offer suggestions? I wish to use this for outgoing connections only so I have no gettys on this port. The relevant portion of /etc/ttys is ttyd0 "/etc/getty std.9600" dialup off # modem line and the relevant portion of /etc/termcap is sd|du|dialup:\ :tc=unknown: su|dumb|un|unknown:\ :am:bl=^G:co#80:cr=^M:do=^J:nl=^J: The relevant portion of /etc/remote is micom|hardwire:\ :dv=/dev/ttyd0:\ :br#9600:\ :el=^C^S^Q^U^D:\ :ie=%$:\ :oe=^D: The cabling goes from the DS3100 to Dec H8571A adapter to convert the 6 wire cable to a regular DB25 connector. This adapter is to connect the following pins: Dec MMJ connector DB25 ` 1 DTR 20 DTR 2 Trans. data + 2 Trans. data 3 Trans. data - 7 Signal ground 4 Recv. data - 7 Signal ground 5 Recv. data + 3 Recv. data 6 DSR { 6 DSR and { 8 DCD The linedriver expects only the signals trans. data, recv. data, signal ground, and DTR (i.e., pins 2, 3, 7, and 20). At the advice of local communication gurus I connected pins 6, 8, and 20 between the Dec adapter and the linedriver; however, the same thing (i.e., nothing) seems to happen if I connect them straight through. Have I miswired these cables? Am I using the wrong device file (/dev/ttyd0)? Is /etc/remote misconfigured? Is there another file I must configure? ... Any suggestions would be greatly appreciated! Thanks. -- ==================================================================== Brook G. Milligan Internet: brook@emx.utexas.edu Department of Botany Bitnet: bohk313@utaivc University of Texas at Austin UUCP: ...!ut-emx!brook Austin, Texas 78713 U.S.A. (512) 471-3530 ====================================================================
chris@mimsy.umd.edu (Chris Torek) (02/24/90)
In article <24976@ut-emx.UUCP> brook@ut-emx.UUCP (Brook Milligan) writes: >I am trying to connect the modem port of a DS3100 .... What modem port? The built-in tty ports on the DS3100 are virtually useless for anything but hardwired lines, as they implement only receive and transmit signals. (They also, it seems, cheat on the output levels.) Although you could connect these ports to a dial-out modem, you would never be able to tell if it lost its connection (no DTR). -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163) Domain: chris@cs.umd.edu Path: uunet!mimsy!chris
grr@cbmvax.commodore.com (George Robbins) (02/25/90)
In article <22728@mimsy.umd.edu> chris@mimsy.umd.edu (Chris Torek) writes: > In article <24976@ut-emx.UUCP> brook@ut-emx.UUCP (Brook Milligan) writes: > >I am trying to connect the modem port of a DS3100 .... > > What modem port? > > The built-in tty ports on the DS3100 are virtually useless for anything > but hardwired lines, as they implement only receive and transmit signals. From reading the DS3100 manual it appears that one of the ports on the DS3100 may implement "DTR" and "DSR" style signals. This would be somewhat better than nothing. I'm not sure why there's confusion on this point, perhaps the VS3100 doesn't have this cabability and the similarity between the two has been overplayed. -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)
jg@max.crl.dec.com (Jim Gettys) (02/25/90)
The right way to think about the DECstation 2100/3100 relative to the VAXstation 3100 is that they share the same box (and therefore external connectors) and SCSI peripherals. Beyond that, they are completely different machines. All other bets are off... Unfortunately, I don't know the answer to the question, but it is certainly possible that DTR and DSR is implemented. - Jim