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"D0" is not a modbus address. "0" is though, so I'm not sure if the D is part of some weird addressing scheme the hardware is using or not. It might just mean decimal. If so, then you can just specify 0 in quickmod pro (after a restart because you already entered 40,001) for D0. It may not be working, however, because you have the wrong I/O type. I'd start with Read Holding S16, then move to Read Input S16, or if this is a digital, Read Status.

I'm sorry I can't give you more detail, but unfortunately, even though Modbus is technically a standard protocol, different manufacturers implement and document it in very different ways. Often times its good just to experiment, especially when simply trying to read values. If you still have troubles, I would need to see the manual for your hardware.

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