Created Date: April 23,2018

Created by: Emilfn

Hello

I can for the life of me not connect to my PLCs anymore (through serial port 2). It has been working perfectly fine a couple of weeks ago, but now I can't access any of my PLCs through port 2. I am using a USB to Serial adapter (Brainboxes US-101), which was working just fine, as well, earlier on.

I have tried connecting to port 2 on the following CPUs: C0-10DRE-D, C0-00DR-DR and CO-11DRE-D. For some reason I can still connect to the Serial interface on port 1 on the C0-00DR-D. But not port 2. The other CPUs only have Serial on port 2, so I need to be able to connect through this.

I have tried;

- reinstalling/updating drivers etc.

- different COM ports.

- different USB ports.

- another serial cable.

- another computer (though similar in specs).

Have not tried another adapter (don't have access to one).

Nothing is connected to the I/O on the PLC, and it is getting 23.94V.

The settings are default: BAUD 38400, CLICK address 1, Parity Bit Odd, Stop Bit 1.

I'm on Windows 10.

I hope someone can help me with this. Thank you in advance. :-)

Kind regards,

Emil

Created Date: April 24,2018

Created by: Emilfn

Serial Port 1 has fixed settings, but the Port 2 settings can be changed. So you have to know the port settings in the current project, or try the auto detect. But that won't work if the Port 2 is set for ASCII. The other two part numbers you mention are Ethernet models, so you should always be able to connect your PC to the local Ethernet and discover their IPs.

Thank you very much for your reply. :-) The settings for port 2 should not have been changed. The PLCs are new and we haven't changed anything in regard to their connection method.

I am aware of the option to connect via ethernet to the other two, though I would very much like to be able to connect via the serial port still. So I hope to find a solution to my issue. :-)

Created Date: April 24,2018

Created by: Emilfn

Serial Port 1 has fixed settings, but the Port 2 settings can be changed. So you have to know the port settings in the current project, or try the auto detect. But that won't work if the Port 2 is set for ASCII. The other two part numbers you mention are Ethernet models, so you should always be able to connect your PC to the local Ethernet and discover their IPs.

So I went with your idea of using ethernet. I connected to the PLC and it worked flawlessly. I then proceeded to reset the PLC to factory settings, and after that I was able to connect via Port 2 and serial. I really can't see how this should have happened. Last time I was connected to the PLC through serial, I did not make any changes or upload anything to the PLC. Oh, well. :-)

Thank you for leading me to a solution!