[Info-vax] DEC3000->DECServer90TL->CMM comunication problem

[Bill Gunshannon]

In article <kkpqqu$etb$1 at dont-email.me>,
	David Froble <davef at tsoft-inc.com> writes:
> Steven Schweda wrote:
>>> - we tried to connect a PC with WinXP to the DECServer ports
>>> through RS232 and "listen" on the Hyperterminal software to
>>> the ports (setting appropriate transmission parameters) but
>>> without any success. On the other hand, we are not sure about
>>> the wiring between the RJ45 -> RS323 (9 pins).
>> 
>>    Sounds reasonable, if you could trust your cable.
>> 
>>    I normally use null-modem cables with 25-pin connectors,
>> and then 25-pin-to-9-pin adapters when I want to connect to a
>> 9-pin serial port on a computer.  The result seems to be as
>> follows (which will look better with a fixed-width font):
>> 
>>                   DS90TL port (F)
>> 
>>     i     i     o     -     o     o     o     i      in/out
>>     1     2     3     4     5     6     7     8
>>    Rgnd  RXD   Tgnd  CTS   RTS   TXD   DTR   DSR
>>                Gnd   (nc)   +-----------+
>> 
>>    ---------------------____--------------------
>> 
>> 
>>       D-9 (F)
>>    5  4  3  2  1
>>     9  8  7  6
>> 
>> 
>>          DCE   DS90
>>          D9F    RJ
>>    +-- DCD 1 - 8 DSR
>>    |   TXD 2 - 6 TXD
>>    |   RXD 3 - 2 RXD
>>    |   DSR 4 - 7 DTR ----+
>>    |   GND 5 - 1 Rgnd    |
>>    |           3 Tgnd    |
>>    +-- DTR 6 - 8 DSR     |
>>        CTS 7 - 5 RTS ----+
>>        RTS 8 - 4 CTS
>>        RI  9 - nc
>> 
>>    Pins 1 and 6 of the D-9 connector are joined in my
>> (null-modem) cable.  Pins 5 and 7 of the DS90 are joined by
>> the DS90.  I don't claim that it's all correct, but it seems
>> to work here, so it should be adequate for your testing.
> 
> The major problem with this description is, from what direction is the 
> plug (DB9) (RJ45) being observed ....
> 
>:-)
> 
> Ask me how I know this ....

What difference wold that make?  Every DB9 I have ever seen had the
numbers embossed on the connector.

bill

-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>