The main function of the TD321D485-L / TD521D485-L series is to convert a logic level signal into isolatedRS485 diferential level signals. The special integrated IC technology of the RS485 transceiver achievesisolation between the power supply and the signal lines isolation, does RS485 communication andprotects the bus all in one and the same module. The product's isolated power supply withstands a testvoltage of up to 3000VDC. Also, they can easily be embedded in the user's end equipment, to achievefully functional RS485 network connections. The products feature ultra-low power consumption and arequaranteed in coal mines, chemical industry areas with continue operating at low energy consumption.