i want to communicate acs 880 using modbus rtu and ac800 m
<how communication between ac800 m and acs880 vfd will take place>?
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Could you please give us more information about your hardware architecture? For example would you like to use Com3 port of CPU (for single CPU) or CI853 Card(For redundanr CPUs).
If you will use CI853 card for modbus RTU protocol there is an application exist.
Please see below link for more detail:
Hope it helps you.