The main function of the TD321S485 /TD521S485 series is to convert a logic level signal into isolatedRS485 differential level signals. The special integrated lC technology of the RS485 transceiverachieves isolation between the power supply and the signal lines isolation, does RS485communication and protects the bus all in one and the same module. The product's isolated powersupply withstands a test voltage of up to 2500VDC. The Products are using pick and place SMDtechnology, thus enabling the use of fully automated processing. Also, they can easily be embedded inthe user's end equipment, to achieve fully functional RS485 network connections.