Serial communication with Mitsubishi A system PLC

Hi!

I am having some problems to connect Ignition to a Mitsubishi A system PLC via serial COM port communication.
The set-up looks like this:
PLC serial module - Moxa RS232/TCPIP - Moxa Nport (convertion to COM) - SCADA
This setup is running with the old scada.

Can both scada use the same COM port?
I have tested disconnect the old scada and connect using Kepware Mitsubishi serial driver as a hub but with no success.
Thanks!

No, only one master can run a serial port. Kepware should be able to support multiple SCADA clients through the one serial driver, but performance will suck.