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485 Programming to V-350 PLCs

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I have an issue where I am trying to use the Visilogic to program to 10 remote PLCs. The PC is using Com 1 port. I am using a 232 to 485 converter out of the port. I have all of the Unitronics PLCs set to addresses 64 to 74. I can use Citect and KepServer and other Modbus drivers to talk to the PLCs NO PROBLEM. These seem to work fine. I cannot however get the Unitronics software that is installed on the same PC to communicate to any of these PLCs. Any ideas. Unitronics says it will work. Thanks DLR

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