modicon quantum to scada pack 357 rs232


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I need these two PLC's to communicate and have had zero success. Its mission critical now. Modicon quantum 140cpu43412a to scada pack 357 com2 rs 232.

I've been on a power generation project for two weeks and this is my last hurdle to overcome. I have repeatedly tried to establish comms but thus far to no avail. I cannot access the modicon logic so that side i'm flying blind, but have full access to the 357. any help is massively appreciated.