The main function of the TD321S485H-A/TD521S485H-A 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 3000VDc. In addition, the product features an automatic switching function, that nolonger requires the need to pass through the node to send and receive control signals, which to a certainextent, reduces the design complexity. The Products are using pick and place SMD technology, thusenabling the use of fully automated processing. Also, they can easily be embedded in the user's endequipment, to achieve fully functional RS485 network connections.