RJ45 to RS232

I need to put together an adapter that will take the DCE end
of a rollover cable and allow me to connect to a DB25, RS232, DCE type
device.

I've made a drawing for it that can be viewed at
http://paws.wcu.edu/fatkinson/APRS/RS232_RJ45.pdf.

I'd appreciate any feedback on it. Jameco has the adapter but
you have to set the pins yourself. That's why I need the drawing.

Regards,



Fred

 

I've revised the drawing showing the proper color code for the
pinout in the RJ45/RS232 adapter. However, I've put this adapter
together accordingly and connected it to a Cisco rollover cable and
plugged it into a DCE type device (that I am confident is working).

I'm not getting any data from the unit. I've checked my
settings and it seems to be right.

You can take another look at the pinout at
http://paws.wcu.edu/fatkinson/APRS/RS232_RJ45.pdf. Does anyone see
any problems with it?

Regards,




Fred Atkinson

 

Just curious what are the devices at each of this specil cable ?

 

Are you trying to build the equivalent of a Cisco
RJ-45-to-DB-25 male DCE adapter (labeled "MODEM") CAB-25AS-MMOD


RJ-45 Pins MMOD Pins
1 5
2 8
3 3
4 7
5 7
6 2
7 20
8 4

 

That did it. I tested the leads that way and they work.

The only problem is that both pins four and five are supposed
to plug into pin 7 on the DB25. That is not easily doable without
some soldering or something.

Do you think I might be able to find another pin for a ground?
Regards, and my thanks,



Fred

 

I see CAB-25AS-MMOD for sale on ebay and from a number of suppliers if
you are not able to find an extra pin

 

That's not what I meant. I meant a pin on the DCE unit that
carried a ground.

No matter. I've got it working.

Regards, and thanks.



Fred Atkinson

 

The Fix

I used just one of the grounds for my console cables I made up..... they are "usually bridged signal grounds". What was your fix, and can you post pin-out used ?





Thx,
Eric Peyser