allen-bradley L552/C rs232 won't connect

[rudydeez]

Hello,
I'm not very experienced with plc's. Starting out.
Is there a way to connect with Ethernet without using rs232. Unkown ip address. I can't go online with rs232. My other plc works fine. So I guess sothing wrong with the port.
Thank you

 

[dmroeder]

You can in fact connect via RS232 in order to configure and/or determine the IP address of the controller. Assuming that the serial port of the SLC is at it's default configuration of DF1. You must use what is called a Null Modem cable like the 1747-CP3 or 1756-CP3.

Can you share some information about what you have to work with here? RSLinx version, cables/adapters you have, operating system?

edit: When you say that your other PLC works fine, does that mean that you can connect fine over the RS232 port?

 

[rudydeez]

I can connect to another plc with the cable I have.

Thank you

 

[dmroeder]

What model is the other PLC and what cable are you referring to?

Could you answer my other questions?

 

[rudydeez]

Thanks for your help.
I did the ground to VBB procedure, now works fine.