SW per verifica RS485

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salve tutti,
sto cercando un sw su winzoz che possa aiutarmi verificare quello che succede su un bus rs485.
sto testando la comunicazione in modbus tra due mega e vorrei verificare le trame che si scambiano tra di loro.
ho un adattatore usb/rs485 ma non trovo di che gratuito sul web...

chi può dirmi cosa usare? :o

grazie e buon pranzo!



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