1. ആമുഖം
The Waveshare Industrial Modbus RTU Analog Input 8CH module is a high-precision industrial-grade data acquisition device designed for robust and reliable performance in various industrial environments. It supports 8 channels of simultaneous analog input, capable of acquiring both voltage and current signals with 12-bit resolution. Utilizing the standard Modbus RTU protocol over an RS485 interface, this module offers wide compatibility with industrial control systems such as PLCs and host computers.
Key features include a wide DC 7~36V power supply range, multiple isolation protections (power, magnetic, resettable fuse, TVS), and configurable input ranges, making it a versatile solution for precise analog data monitoring.
2. Features At A Glance
- High-Precision Acquisition: 12-bit resolution with an accuracy of ≤3% for precise data.
- Multi-Channel Input: 8-channel simultaneous analog acquisition.
- Flexible Input Modes: Supports single-ended/differential input and simultaneous voltagഇ, നിലവിലെ ഏറ്റെടുക്കൽ.
- Configurable Ranges: ഒന്നിലധികം വോള്യംtage and current ranges configurable via software (e.g., 0-5V, 1-5V, 0-10V, 2-10V, 0-20mA, 4-20mA).
- Modbus RTU Protocol: Standard protocol for wide compatibility with industrial systems.
- RS485 ഇന്റർഫേസ്: Allows cascading of multiple devices with configurable addresses (1~255).
- വൈഡ് വോളിയംtagഇ പവർ സപ്ലൈ: Operates on DC 7~36V.
- Industrial-Grade Isolation: Onboard unibody power supply isolation and magnetic isolation for signal integrity and strong anti-interference.
- ശക്തമായ സംരക്ഷണം: Features resettable fuse, TVS (Transient Voltage Suppressor) for surge, over-current/over-voltage, lightningproof, and ESD protection.
- സ്ഥിരമായ പ്രവർത്തനം: Built-in oversampling digital filtering algorithm and watchdog for stable output without crashing.
- എളുപ്പമുള്ള ഇൻസ്റ്റാളേഷൻ: Rail-mount case design (35mm standard guide rail) and support for stacking combination.
- നില സൂചകങ്ങൾ: Three LEDs (RXD, TXD, STATUS) for monitoring MCU and communication status.
3 സ്പെസിഫിക്കേഷനുകൾ
| പരാമീറ്റർ | Modbus RTU Analog Input 8CH | Modbus RTU Analog Input 8CH (B) |
|---|---|---|
| ആശയവിനിമയ ഇൻ്റർഫേസ് | RS485 | |
| ബൗഡ് നിരക്ക് | 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 | |
| Default Communication Format | 9600, N, 8, 1 | |
| മോഡ്ബസ് പ്രോട്ടോക്കോൾ | Standard Modbus RTU protocol | |
| വൈദ്യുതി വിതരണം | DC 7~36V | |
| Sampലിംഗ് കൃത്യത | 12-bit resolution, accuracy ≤3% | |
| ഡാറ്റ അപ്ഡേറ്റ് നിരക്ക് | 25Hz | |
| ഇൻപുട്ട് മോഡ് | Supports single-ended/differential input, supports voltage and current simultaneous acquisition | |
| ഡിഫോൾട്ട് മോഡ് | 8-ch current mode, 0~20mA | 8-ch voltage mode, 0~10V |
| പരിധി | 0~5V/1~5V 0~20mA/4~20mA |
0~10V/2~10V 0~20mA/4~20mA |
| നിലവിലെ എസ്ampling Resistor | 249Ω | 499Ω |
4. പാക്കേജ് ഉള്ളടക്കം
The package contents vary slightly depending on the version purchased:
Modbus RTU Analog Input 8CH (Standard Version)
- Modbus RTU Analog Input 8CH x1
- Power supply terminal adapter x1
Modbus RTU Analog Input 8CH (B) (B Version)
- Modbus RTU Analog Input 8CH (B) x1
- Power supply terminal adapter x1
- Jumper cap 10PCS x1
കുറിപ്പ്: The power supply for this product is not included. A 12V power supply is recommended if needed.
5. സജ്ജീകരണവും ഇൻസ്റ്റാളേഷനും
5.1 ഇന്റർഫേസ് ഓവർview
Familiarize yourself with the module's interfaces:
5.2 പവർ സപ്ലൈ കണക്ഷൻ
Connect a DC 7~36V power supply to the 7-36V ഒപ്പം GND terminals. Ensure correct polarity. The module features anti-reverse protection, ESD protection, and power supply/signal dual isolation for enhanced safety and reliability.
5.3 RS485 ആശയവിനിമയ കണക്ഷൻ
Connect the RS485 A+ and B- terminals to your host device (PC or PLC). Multiple modules can be cascaded on the RS485 bus by setting unique device addresses (1~255) for each module.
5.4 Analog Input Configuration
The module supports both voltage and current acquisition. The input mode (voltage or current) is switchable via jumpers. Specific ranges are configurable via software.
- Modbus RTU Analog Input 8CH (Standard): Supports 0~5V/1~5V and 0~20mA (default)/4~20mA.
- Modbus RTU Analog Input 8CH (B): Supports 0~10V (default)/2~10V and 0~20mA/4~20mA.
Refer to the detailed wiring and jumper settings in the diagram below for configuring voltage or current acquisition and selecting the appropriate range.
5.5 Physical Installation (Rail-Mount)
The module is designed for 35mm standard guide rail mounting. It comes with a rail-mount buckle for easy installation. For stacking multiple modules, remove the rail-mount buckle from the outer module, then assemble the modules together using screws.
6. പ്രവർത്തന നിർദ്ദേശങ്ങൾ
6.1 Primary Function
The module's primary function is to acquire analog data from 0~20mA or 0~10V sensors and transmit it to a host device (PC or PLC) using Modbus RTU protocol commands via the RS485 interface.
6.2 Modbus RTU Communication
The module operates as a Modbus RTU slave device. Your host system (master) will send Modbus commands to read the analog input registers. The default communication format is 9600, N, 8, 1 (Baud Rate, Parity, Data Bits, Stop Bits). The device address is configurable from 1 to 255.
For detailed Modbus register maps and command structures, please refer to the product's Wiki page mentioned in the 'Warranty & Support' section.
6.3 LED സൂചകങ്ങൾ
- RXD LED: Indicates data reception activity on the RS485 interface.
- TXD LED: Indicates data transmission activity on the RS485 interface.
- സ്റ്റാറ്റസ് LED: Indicates the MCU's working status. Refer to the Wiki for specific status codes or patterns.
7. പരിപാലനം
- വൃത്തിയാക്കൽ: Keep the module clean and free from dust and debris. Use a soft, dry cloth for cleaning. Avoid using liquids or abrasive cleaners.
- പരിസ്ഥിതി വ്യവസ്ഥകൾ: Ensure the module operates within its specified temperature and humidity ranges to prevent damage.
- ഫേംവെയർ അപ്ഡേറ്റുകൾ: Check the Waveshare Wiki periodically for any available firmware updates that may improve performance or add features. Follow the instructions provided for safe updating.
- കണക്ഷൻ സമഗ്രത: Regularly inspect all wiring connections (power, RS485, analog inputs) to ensure they are secure and free from corrosion or damage.
8. പ്രശ്നപരിഹാരം
- പവർ/മൊഡ്യൂൾ ഇല്ല പ്രതികരിക്കുന്നില്ല:
- Verify the DC 7~36V power supply is correctly connected and providing the specified voltage.
- Check the power supply terminal adapter for proper connection.
- Ensure the power supply itself is functional.
- No Communication via RS485:
- Confirm RS485 A+ and B- connections are correct.
- Check the baud rate, parity, data bits, and stop bits settings on both the module (default 9600, N, 8, 1) and the host device.
- Verify the module's device address is unique and matches the address used by the host.
- Ensure the RS485 bus is properly terminated if necessary (refer to RS485 best practices).
- Check the RXD/TXD LEDs for activity. If no activity, check wiring and host communication settings.
- Inaccurate Analog Readings:
- Confirm the correct input mode (voltage/current) is selected via jumpers.
- Verify the software-configured range matches the sensor's output range.
- Ensure the sensor is correctly wired to the AIx+ and AIx- terminals.
- Check for external electrical noise or interference in the environment.
- Ensure the sensor itself is calibrated and functioning correctly.
- Module Crashing/Unstable:
- While the module has a built-in watchdog, ensure the power supply is stable and within the specified voltagഇ ശ്രേണി.
- Check for excessive heat if operating in a confined space.
9 ഉപയോക്തൃ നുറുങ്ങുകൾ
- സോഫ്റ്റ്വെയർ കോൺഫിഗറേഷൻ: Always refer to the official Waveshare Wiki for the latest software tools and detailed instructions on configuring input ranges and device addresses.
- Wiring Best Practices: For industrial environments, use shielded cables for analog inputs and RS485 communication to minimize interference. Ensure proper grounding.
- പരിശോധന: Before deploying in a critical application, thoroughly test the module with known voltage/current sources across all desired ranges to verify accuracy and stability.
- ഡോക്യുമെൻ്റേഷൻ: Keep a record of your module's configuration (device address, baud rate, input ranges) for easier troubleshooting and maintenance.
10. വാറണ്ടിയും പിന്തുണയും
For detailed technical documentation, programming guides, software tools, and further support, please visit the official Waveshare Wiki:
www.waveshare.com/wiki/Modbus_RTU_Analog_Input_8CH
Waveshare provides comprehensive resources to assist users with their products. Please refer to the Wiki for the most up-to-date information and troubleshooting guides.





