Check the listing for details. 3 PCS 3.3V UART serial to RS485 SP3485 Transceiver Converter Module. Condition: New. Listed at 3.38 USD. Product Name: 3 PCS 3.3V UART serial to RS485 SP3485 Transceiver Converter Module Package inlcuded: 3 PCS R411B01_3V3 DC 3.3V RS485 to LvTTL RS232 converter Description: Read/write automatic control RS485 TO RS232(3.3V TTL Logic level) converter Operating Voltage : DC 3.3V Logic level : 3.3V LvTTL Logic level RS485 BUS IC : SP3485 Read and write automatic control IC :SM74HC04 7x 2.54MM pin(Does not include pin),mini size. Size : 17.9x11.7x2.8mm(very small) Weight :Only 0.7g(Very light) Application RS485 Temperature and humidity sensor PTZ camera LED controller MODBUS RTU RS485 Relay 485 sensor automated manufacturing line Wifi to RS485(ESP8266) Bluetooth to RS485(HC-05/HC06) Wireless Module to RS485(HC-11) Ethernet to RS485(Ethernet TTL Module) Wiring Diagram: