Industrial 8-channel PWM input module RS485 Modbus RTU isolated Waveshare
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Industrial 8-channel PWM input module RS485 Modbus RTU
Industrial, 8-channel PWM input module communicating via RS485 interface using the Modbus RTU protocol. The device enables precise detection of frequency and duty cycle of PWM signals, supporting frequencies from 400 Hz to 50 kHz. It is equipped with comprehensive protections, including galvanic isolation, a polymer fuse, and TVS diodes, which guarantees stable and safe operation in industrial applications.
Key features
- Isolated RS485 interface for 8-channel PWM input acquisition.
- High-speed optocoupler isolation supporting high-frequency signal detection.
- Configurable device address (1~255) with the possibility of cascading on the RS485 bus.
- Wide power supply range 7~36V DC.
- Integrated power and signal isolation requiring no additional power supply on the isolated terminal side.
- Industrial protections: polymer fuse, TVS diodes, ESD and surge protection.
- Built-in hardware Watchdog ensuring stable and continuous system operation.
- Enclosure with easy DIN rail mounting and cascading capability.
- 3 LED indicators for monitoring MCU status and signal transmission.
Functionality and application
The main task of the module is to collect signals in the form of PWM pulses and make them available for reading in the master system. This is done by sending appropriate commands using the protocol Modbus RTU via the bus RS485. The module is ideal for automation systems, readings from industrial sensors, and advanced process control systems.
Industrial isolation and protections
The board implements dual power and signal isolation for RS485 communication. This ensures a high level of reliability and very high resistance to electromagnetic interference in harsh environments. Built-in TVS diodes (Transient Voltage Suppressor) effectively suppress voltage spikes and transients in the circuit, protecting the system against lightning strikes and electrostatic discharges (ESD). In turn, the polymer PTC fuse and protective diodes ensure resistance to overcurrent and overvoltage, stabilizing power consumption and output voltage.
Technical specification
- Communication interface: RS485
- Baud rate: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 bps
- Default communication format: 9600, N, 8, 1
- Protocol: Standard Modbus RTU
- Supply voltage: DC 7~36V
- Pulse input voltage: 3.3V ~ 30V
- Frequency detection range: 400Hz ~ 50kHz
- Frequency resolution: 0.01Hz
- Frequency accuracy: 5‰
- Duty Cycle detection range: 0 ~ 100%
- Duty cycle resolution: 0.01%
- Duty cycle accuracy: 5‰
Kit contents
- Modbus RTU PWM Input 8CH module
- Terminal adapter for easy power connection
- Screwdriver for easy installation
Shipping costs
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