This product is an industrial-standard isolated RS485 8-channel PWM pulse input module. It supports the detection of PWM pulse frequency and duty cycle. Input uses high-speed optocoupler isolation, supporting high-frequency detection. Supports setting device addresses (1~255) for cascading multiple devices via RS485 bus. Onboard voltage regulator chip supports a wide voltage range of 7V~36V. Onboard integrated power isolation provides stable isolation voltage, requiring no additional power supply to the isolation terminal. Onboard integrated magnetic coupling isolation provides signal isolation, high reliability, and strong anti-interference. Onboard resettable fuse and TVS (transient voltage suppressor) effectively suppress surges and transient voltage spikes in the circuit, protecting against overcurrent, overvoltage, lightning, and electrostatic discharge. Built-in watchdog ensures stable output and prevents system crashes. DIN rail housing design supports stacking, facilitating easy installation and safer use. Three external LED indicators provide easy monitoring of MCU status and signal transmission/reception status. Color: As Shown Material: PCB Package Contents: 1*module 1*adapter 1*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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.