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Dear, Modbus is about reading registers values by calling them by thier addresses. So you have to find a dll library (or u can design your own) which work on your required interface and connect to delta dvp plc then use thier protocol to read registers.
u can find info about thier modbus protocol in below link.
file:///C:/Users/HASEEB/Downloads/DVP_%20communication%20Protocol.doc
