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From: cstar@marlin.jcu.edu.au (Terry Rawlings)
Newsgroups: comp.sys.mac.comm
Subject: Help needed connecting black box with Mac serial port.
Message-ID: <1991Mar21.062024.23159@marlin.jcu.edu.au>
Date: 21 Mar 91 06:20:24 GMT
Article-I.D.: marlin.1991Mar21.062024.23159
Organization: James Cook University
Lines: 35

Hi,

I need some help connecting a black box with a Macintosh serial port.

This box is currently being used on an IBM-PC connected with a home-made cable.
The plug on the IBM-PC is a DB-9 and the connection on the black box is a DB-25.
The cable setup is as follows:

       DB-9	  DB-25

DCD	1 ---|
RTS	7 ---|
CTS	8 ---|

DTR	4 -----|
DSR	6 -----|

RD	2 --------- 2
SD	3 --------- 3
GND	5 --------- 7

I'm trying to use this black box on a Macintosh with a mini-DIN 8 plug.
What I need to know is if it is necessary to do the same fooling around 
connecting DCD, RTS and CTS as well as DTR and DSR on the 8 pin plug.  I've
read the bit in the Family Hardware Reference about connecting the RxD+ and
the GND and reading and sending the data through TxD- and RxD- but am unsure
about what needs to be done with the rest of the signals.

Any help would be greatly appreciated,
Terry.

--
Terry Rawlings				cstar@marlin.jcu.edu.au
Cyclone Structural Testing Station
James Cook University