| From: | Don Cox |
| Date: | 9 May 2000 at 11:39:03 |
| Subject: | Re: well? |
On 09-May-00, Colin Wenzel wrote:
>> I have tried a null modem cable, but to no avail. Anyone know the
>> pinout of the 3000 Tower for the serial port?
>>
>> Thank you,
>> Gene
>
> I believe you will need a cable that has the TXD & RXD reversed on one
> end, so that TXD from one end goes to RXD on the other end &
> visa-versa, off hand I think that was pins 2 & 3 on a D25 connector.
If you are using X-on X-off handshaking, you only need 3 wires. On a
25-pin connector, that is 2 to 3, 3 to 2 and 7 to 7. If that doesn't
work, try 2 to 2 and 3 to 3. 7 is ground.
You can make one up with 2 plugs and some 3-core lighting flex. RS232 is
not critical electrically, so long as you have the right connections.
The problem comes from the lack of an agreed standard for hardware
handshaking connections.
There are some good suggestions in "The Art of Electronics" by Horowicz
and Hill.
Regards
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