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000070_news@columbia.edu_Tue Jun 6 02:39:10 1995.msg
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From: roberson@hamer.ibd.nrc.ca (Walter Roberson)
Newsgroups: comp.protocols.kermit.misc,comp.sys.sgi.admin
Subject: Re: Using C-Kermit thru a tty port to a PC
Date: 6 Jun 1995 02:39:10 GMT
Organization: National Research Council of Canada
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In article <3qvbm1$av4@cuboulder.colorado.edu>,
Rick Grubin <grubin@spot.Colorado.EDU> wrote:
:Having followed the advice in "Using MS-DOS Kermit" to get
:two PCs to talk via a null modem cable, I'm being asked to
:do a similar task using an SGI and a PC. I have the book
:"Using C-Kermit" and have been successful in using kermit
:from the PC to talk to the SGI; now I'd like to go the other
:way, using C-kermit on the SGI to talk to the PC via a null
:modem cable. The SGI is an Indy running IRIX v5.3.
:I fear that the tty ports on the SGI are not configured
:correctly, and do not know what is necessary to set up to
:do this task. Any pointers/recommendations/examples (!)
:would be greatly appreciated. Thanks in advance.
There is very little to it. Just make sure that the port has been
turned 'off' in /etc/inittab. When you get into kermit, 'set line'
to whichever port you want (eg, set line /dev/ttyd2 ) and
'set speed' to whatever rate you want (eg, set speed 38400 ).
Kermit does the rest of the configuring itself.
You mention in one of your other postings that you do not have the manuals
for your system. As such, you might not be aware that the serial port
pin-out on the SGI is different than that on the PC. The DB-9 type
connectors on an SGI are configured practically the same way as you would
a DB25 connector, with the exception that what would be on pin 20 of the
DB25 is carried on pin 9 of the DB9. Mini-DIN-8 connectors on the SGI are
fairly different, and follow the MAC pin-outs:
| 1 | DTR | Data Terminal Ready |
| 2 | CTS | Clear To Send |
| 3 | TD | Transmit Data |
| 4 | SG | Signal Ground |
| 5 | RD | Receive Data |
| 6 | RTS | Request To Send |
| 7 | DCD | Data Carrier Detect |
|__8____|_SG______|_Signal_Ground__________|
If you are using rates above 9600 bps, you should definitely use hardware
flow control by wiring the appropriate pins and using /dev/ttyf* instead
of /dev/ttyd* . Hardware flow control is a superset of modem control
(/dev/ttym*), so you would need to cross-wire the CD (carrier detect) line
to hold it high for your application.
Walter Roberson roberson@ibd.nrc.ca