Re: //c serial cable

[daimyo@powersurfr.com]

On Mon, 2 Nov 1998 01:48:42 +1300, dempson@actrix.gen.nz (David
Empson) wrote:

<redundant stuff snipped>
>Try this combination:
>
>D-9        DIN-5
> ?          1         (Flow control from IIc)
> 2          2         (Data from IIc)
> 5          3         (Ground)
> 3          4         (Data to IIc)
> 4          5         (Flow control to IIc)
>
>Pin 1 from the IIc probably doesn't need to go anywhere.  You might like
>to connect it to any of pins 1 (DCD), 6 (DSR) or 8 (CTS) on the PC,
>depending on what the software on the PC requires.  You could leave it
>unconnected.
>
>Pin 5 from the IIc can go to either pin 4 (DTR) or pin 7 (RTS) on the
>PC, depending on what the software wants to do.  It must be connected to
>an active flow control signal on the PC, or the IIc won't receive
>anything.
>
>As far as the IIc is concerned, the flow control signals are nominally
>DTR (pin 1) and DSR (pin 5), but they are actually connected to the RTS
>and DCD pins on the 6551 serial chip.  This means that deactivating the
>output flow control signal (RTS) will prevent the IIc transmitting, and
>deactivating the input flow control signal (DCD) will prevent the IIc
>receiving.

I'll confess, the different types of flow control are over my head.
however, I tried all 6 possible permutations of the cable wiring and
still no success.

1-6/8/1
5-4/7

i've tested my pins with a multimeter so i know the individual leads
are good.  any suggestions on how to further test the cable?  perhaps
i'm screwing up elsewhere.  as per the ADT README documentation, i am
using a modem program (specificallly telix, configured to the serial
port in question) with ascii uploads to the //c after typing "IN #2"
at the //c DOS prompt (incidentaly, i am using prodos when the readme
suggests DOS 3.3 - problem? i can't imagine how).  i also tried
redirecting output with "PR#2" but i have yet to see evidence of any
communication between the two machines.

thanks, 
joe
 

>
>> I've searched the web for this information and the DIN5 wiring pinout
>> is not included in RS232C information
>
>Not surprising, since the DIN-5 connector is nonstandard for RS-232
>connections.  This connector and pinout is unique to the serial ports of
>the Apple IIc.  It is documented in the IIc technical reference manual.
>
>-- 
>David Empson
>dempson@actrix.gen.nz
>Snail mail: P.O. Box 27-103, Wellington, New Zealand