F4-MAS-MB(R) (405 Modbus Master Module)
 
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.pdf F4-MAS-MB-M
 
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arrow   FAQ:
    Q. Can both ports be used as Modbus Masters?
A. No, only one port can be Modbus master. If port 2 is used as the Modbus master port then port 1 can be enabled as a diagnostic port.