Thanks Doug,
The IPC has an 8-pin mini DIN similar to the Mac. In fact the pin-outs
appear to be the same. I had read about the different printer cables
which prompted my question since I've got a spaghetti bowl full of
cables.
I have a 8-pin to DB-9 which works as a null modem (for a PC)...would
another 8-pin to DB-9 (properly gendered) like a Teleport modem cable
work?
Jack
On Sep 9, 2005, at 2:47 PM, Doug McNutt wrote:
At 17:12 -0500 9/8/05, Jack Gallemore wrote:
Actually, I'm wanting to use my CC (or even a plain, old Classic) to
act as a serial console for a couple of Sparc IPCs that I picked up
recently rather than a Mac to Mac type connection.
Now we're making more sense. We need the actual specifications for the
Sparc interface. Knowing Sun I suspect that they followed RS232 specs
pretty carefully providing either a DCE (Data computing equipment) or
DTE (Data terminal equipment) standard 25 pin "D" connector. The last
time I actually did it I was connecting to a Heathkit Z80 which had
both kinds of connectors available on different ports.
Apple to RS232 modem cables are OK for that but the modem will have
sockets and the cable will have pins. If they fit the Sparc it should
be OK. A line in the RS232 spec says that it must be possible to
connect any pin to any other pin without damage to anything.
Note that Apple to RS232 printer cables will NOT work. It seems that
early printer manufacturers ignored the RS232 spec and used the wrong
sex connector for the way they wired the pins. Others followed. Sigh.
If the Apple modem cable doesn't fit because of the wrong sex you can
solder up a 25 pin connector or you can get a "gender changer" but all
of those are NOT the same. Some swap the transmit and receive pins and
others don't.
The modem cable will look like this:
Modem Mac
6 DSR 2 Hsk in Handshake to Mac
20 DTR 1 Hsk out Handshake from Mac
3 TxD 5 RxD- Data to Mac
7 GND 4 GND Logic ground
2 RxD 3 TxD- Data from Mac
7 GND 8 RxD+ Ground the Rs422 RxD+ line
nc 6 TxD+ Ignore RS422 TxD+ from the Mac
1 DCD 7 GFI Carrier detect if Mac is a server
shell CHASSIS Overall shield
Note that the minus items in the Mac are tied to the single ended
RS232 lines.
Software may need to do things like "toggle DTR" to wake up the Sparc
interface. Synergy Software's Versaterm was good at things like that.
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