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From: Andrew McDonald <andrewm@aone.com.au>
Newsgroups: comp.sys.apple2
Subject: Re: Null Modem Question
Date: Wed, 27 Aug 1997 10:43:20 +1000
Organization: Customer of Access One Pty Ltd, Melbourne, Australia
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Message-ID: <34037828.41C67EA6@aone.com.au>
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Cary Guy wrote:
>
> I'm trying to transfer files from my PC to my Apple //e and can't seem
> to get it to work. I was wondering if possibly I'm using the wrong
> cable. I'm using a standard PC serial cable to connect the two
> machines. If this is the wrong thing to do, could some benevolent soul
> be persuaded send me the pinouts for both ends of the cable so that I
> can rewire it?
>
> thanks,
>
> -cary
What you need there Cary is a null modem cable/ null modem adapter. A
standard serial cable won't work. A null modem cable often LOOKS no
different from a standard serial, however the receive data pin on one
end is connected to the send data on the other end and vice versa.
I copied this from http://www.teletechnics.com/cable_null.html
(Didn't see the point of doing it myself considering how many times this
has been already done on the net)
25 pin D to 25 pin D
SIGNAL PIN No. PIN No.
FG 1 ---------------- 1 1 to 1
TD 2 -------\/------- 2 2 to 3
RD 3 -------/\------- 3 3 to 2
RTS 4 -------\/------- 4 4 to 5
CTS 5 -------/\------- 5 5 to 4
DSR 6 --| |-- 6 6 & 8 to 20
SG 7 --+----------+-- 7 7 to 7
DCD 8 ------\/------ 8 see 6
DTR 20 -------/\------- 20 20 to 6 & 8
9 pin D to 9 pin D
PIN No. PIN No.
2 ------\/------ 2 2 to 3
3 ------/\------ 3 3 to 2
4 -----\ /----- 4 4 to 6
5 -------------- 5 5 to 5
6 -----/ \----- 6 6 to 4
7 ------\/------ 7 7 to 8
8 ------/\------ 8 8 to 7
Case ---------- Case
Also described as such:
Connector 1 to Connector 2
DTR DSR/DCD
DSR/DCD DTR
RTS CTS
CTS RTS
TXD RXD
RXD TXD
GND GND
25 pin D to 25 pin D - alternative when 2 computers are both DTE
SIGNAL PIN No. PIN No.
FG 1 ---------------- 1 1 to 1
TD 2 -------\/------- 2 2 to 3
RD 3 -------/\------- 3 3 to 2
RTS 4 -----\ /----- 4 4 & 5 to 8
CTS 5 ------\ /------ 5 see 4
DSR 6 ------\\//------ 6 6 to 20
SG 7 ---------------- 7 7 to 7
DCD 8 ------//\\------ 8 8 to 4 & 5
DTR 20 ------/ \------ 20 20 to 6
--
Andrew McDonald andrewm@aone.com.au
TECHNICAL SUPPORT Why do people who know the least
ACCESS ONE know it the loudest?