The main function of the TDH301D485H / TDH501D485H series is to convert a logic level signal intoisolated RS485 diferential level signals. The special integrated IC technology of the RS485 transceiverachieves isolation between the power supply and the signal lines isolation, does RS485 communicationand protects the bus all in one and the same module. The product's isolated power supply withstands atest voltage of up to 3750VAC. Also, they can easily be embedded in the user's end equipment, toachieve fully functional RS485 network connections.