[SI-LIST] Re: RJ45 interfacing with RS232

Soap Box Time -> there is no such thing as a DB9. The 9 contact =
connector is an "E" size shell thus it would be a DE9. In the standard =
density connectors, the "A" size shell has 15 contacts, the "B" size has =
25, the "C" size has 37 and the "D" size has 50. Thus DA15, DB25, DC37 =
and DD50 as well as the DE9. (Looks like the "E" size was added after =
the original four sizes.) This is apparent from datasheets for =
traditional connector companies. To avoid some of the confusion, some =
manufacturers have switched to using numerical sizes.

My guess is that the confusion with DB9/DE9 came when computer makers =
replaced the DB25 with a DE9 but did not properly update their =
documentation (or users wouldn't change). But that's conjecture on my =
part.


-----Original Message-----
From: steve weir [mailto:weirsp@xxxxxxxxxx]
Sent: Tuesday, 30 September, 2003 12:52 AM
To: bvg_1@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: RJ45 interfacing with RS232


Venu,

Are you asking how to connect from a serial interface that uses RJ45=20
connectors such as CISCO to a DB9 female connector to a PC?  If so, the=20
problem is that there are no set standards for RS232 wiring assignments =
on=20
an RJ45 as there are for DB9 and DB25 connectors.  I know of at least =
five=20
different configurations.  About the only thing they tend to agree on is =

the ground pin assignment.

If you have an existing cable with a DB9 or DB25 connector, then you can =

use an ohmmeter to determine the connections.  Otherwise, if you are =
making=20
a cable to go to existing equipment, you will need to obtain =
documentation=20
about that manufacturer's variation on the theme.


At 10:35 PM 9/29/2003 -0700, venu wrote:
>hi all,
>can any body plz. explain me how to creat an interface between
>RS232 to RJ45 efficiently?
>thanx in advance,
>venu.
>
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