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000309_news@newsmaster….columbia.edu _Wed Jul 29 07:30:06 1998.msg
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From: martinja@exis.net
Newsgroups: comp.protocols.kermit.misc
Subject: Serial ports, cables, and terminals
Date: Wed, 29 Jul 1998 11:21:25 GMT
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Hello,
I have been trying to set up a terminal for my dad. He is using an old
386 with a bootdisk running C-Kermit for MSDOS. I am running Linux 2.0.34
(Slackware 3.4). I am trying to use a null modem cable to connect out two
serial ports together. We are using the 25 pin serial ports. The null modem
adapter I bought at CompUSA did not work, so my dad took apart the serial
cable and rewired it to these specs:
PC male DB25 Terminal DB25
TxD Transmit Data 2 --> 3 RxD Receive Data
RxD Receive Data 3 <-- 2 TxD Transmit Data
RTS Request To Send 4 --> 5 CTS Clear To Send
CTS Clear To Send 5 <-- 4 RTS Request To Send
DSR Data Set Ready 6
|
DCD Carrier Detect 8 <-- 20 DTR Data Terminal Ready
SG Signal Ground 7 --- 7 SG Signal Ground
6 DSR Data Set Ready
|
DTR Data Terminal Ready 20 --> 8 DCD Carrier Detect
The connect still does not work! I have Linux using agetty for the serial
connection. It ran for half an hour without any errors, but the terminal
showed nothing on the screen. Is that the right config for a serial PC-PC
connection? How can I test if the serial ports and cable actually work?
Joseph Martin
--
martinja@exis.net **************
http://users.exis.net/ * Powered by *
* GNU Linux *
"Think different" **************
P.S
When I type "show modem" in C-Kermit this is the output:
Modem is not ready: DSR is off
no carrier detect: CD is off (set carrier is off)
no Clear to send: CTS is off
With the serial config shown above shouldn't I have a modem ready status?
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