features: 1. Compatible with TTL/RS422 standard, can convert TTL signal into differential RS422 signal, and support full 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 provide 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 TVS ( ient voltage suppression tube) can effectively suppress surge voltage and ient peak voltage in the circuit, and prevent static electricity 6. Board mounted self recovery fuse and protective diode can ensure stable output of current and voltage, prevent over-voltage and over-voltage, and improve impact resistance. 7. On board RS422 input and output 120R resistors can be switched with built-in jumper caps. 8. Industrial guide type ABS environment-friendly shell, small size, convenient installation, cost-effective Specifications: Color: white Material: ABS Product type: electrical isolated TTL to RS422 serial port converter Power supply interface: Power supply voltage: 3.3V~5V Interface protection: anti overvoltage and anti reverse connection Equipment interface: compatible with TTL/RS422 standard TTL interface: Interface type: terminal block mission distance: about 10m mission mode: point-to-point RS422 interface: Interface type: terminal block Interface protection: provide anti surge and 15KV static protection Terminal resistance: 120R, which can be switched and enabled through jumper cap (it can be set only after the shell is disassembled) mission distance: about 1200m mission mode: full duplex mode, point to many, (256 nodes can be connected at most, and repeaters are recommended for more than 16 nodes) H