Pinout of Modbus between AC800m & AC450
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Use the AC800 programming cable.
The pinouts are given in the relevant hardware manuals for the AC800 and the programming manual for the Modbus MVI with CI532
However, both the AC450 and AC800M must be modbus masters so cannot communicate with each other unless you use a gateway. Another option is to use the AC800M modbus slave application here on AKS. Note that the modbus slave MUST respond to a FC7 poll request from the AC450 master.