# Serial communication with Mitsubishi A system PLC

**URL:** <https://forum.inductiveautomation.com/t/serial-communication-with-mitsubishi-a-system-plc/104712>\
**Category:** Ignition\
**Created:** [April 4, 2025, 1:44pm UTC](https://forum.inductiveautomation.com/t/serial-communication-with-mitsubishi-a-system-plc/104712 "2025-04-04T13:44:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![alban.m](https://avatars.discourse-cdn.com/v4/letter/a/aca169/32.png) [@alban.m](https://forum.inductiveautomation.com/u/alban.m)\
**Post date:** [April 4, 2025, 1:44pm UTC](https://forum.inductiveautomation.com/t/serial-communication-with-mitsubishi-a-system-plc/104712/1 "2025-04-04T13:44:17Z")

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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!

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [April 4, 2025, 1:51pm UTC](https://forum.inductiveautomation.com/t/serial-communication-with-mitsubishi-a-system-plc/104712/2 "2025-04-04T13:51:52Z")

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> [@alban.m](#):
>
> Can both scada use the same COM port?

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.