8-Input Module Current Measurement 0–20mA RS485 Modbus RTU Voltage Measurement 0–5V
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Modbus RTU Analog Input 8CH Waveshare 25821
Modbus RTU Analog Input 8CH – Industrial Module for Precise Measurement of Analog Signals
Principle of Operation
The module is equipped with 8 independent analog inputs, each of which can be configured to measure voltage or current.
- Operating mode is set physically using jumpers on the module board.
- Input signal gain is configured programmatically via the RS485 interface.
Supported Measurement Ranges:
- For voltage: 0–5V, 1–5V
- For current: 0–20mA (set by default), 4–20mA
Internal Structure
Technical Specification
- Number of channels: 8 analog inputs
- Configurable input modes: voltage or current (set by jumpers)
- Measuring resistor for current measurement: 249Ω
- Resolution: 12-bit
- Data refresh rate: 25Hz
- Communication interface: RS485
- Protocol: Modbus RTU
- Baud rate: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 bps
- Addressing: 1~255 (allows for networking with multiple devices)
- Power supply: DC 7~36V
- LED indicators: power and communication status
- Galvanic isolation of power and signal
- TVS (Transient Voltage Suppressor)
- Resettable fuse
- Surge and ESD protection
- Mounting: Casing adapted for DIN 35mm rail mounting
- Dimensions: 121 × 72 × 34 mm
Package Contents
- Modbus RTU Analog Input 8CH ×1
- Power supply terminal adapter ×1
- Configuration jumpers (10 pieces)
Compatible power supply: ORD-PSU-12V2A-5.5-2.1-EU
Wiki: https://www.waveshare.com/wiki/Modbus_RTU_Analog_Input_8CH
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