features: 1. Compatible with TTL/RS485 standard, can convert TTL signal to differential RS485 signal, half duplex communication. 2. Compatible with 3.3V~5V TTL signal level, with anti reverse connection and anti overvoltage circuit at the power supply end 3. On board integrated power isolation can stable isolation voltage without additional power supply at the isolation end 4. On board integrated digital isolation, signal isolation, high reliability, strong anti-interference and low power consumption 5. On board (transient voltage suppressor) can effectively suppress surge voltage and transient voltage in the circuit, and prevent -and static electricity 6. Board mounted self fuse and protective diode can stable output of current and voltage, prevent over-voltage and over-voltage, and impact resistance. 7. On board RS485 output terminal 120R resistor, which can be switched for easy operation. 8. Industrial guide type ABS environment-friendly shell, small size, convenient installation, cost-effective Color: white Material: ABS Specifications: Product type: electrical isolated TTL to RS485 serial port converter Power supply voltage: 3.3V~5V Interface protection: anti overvoltage and anti reverse connection Equipment interface: compatible with TTL/RS485 standard TTL interface: Interface type: terminal block Transmission distance: less than 10m Transmission mode: point-to-point RS485 interface: Interface type: terminal block Interface protection: 600W -protection, surge protection and 15KV static protection Terminal resistance: 120R, which can be switched and enabled through dial switch Transmission distance: about 1200m Transmission mode: point to many (32 nodes at most, and repeaters are recommended for more than 16 nodes) Housing: rail type ABS environment-friendly housing, suitable for 35mm DIN rail Size: 91.6 x 58.7 x 23.3mm Package Contents: 1 x TTL TO RS485 (B) converter 1 x Screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.