សៀវភៅណែនាំអ្នកប្រើប្រាស់ សំណួរ និងចម្លើយចម្លើយ
ថ្ងៃទី 24 ខែកញ្ញា ឆ្នាំ 2025 - ម៉ោង 02:59 យប់
ដើម្បីភ្ជាប់ និងដំឡើងកម្មវិធី LUMEL NMID30-1 3-Phase Energy Meter using Modbus Protocol over RS485អនុវត្តតាមជំហានទាំងនេះ៖
1. **Physical Connection:**
- Use a twisted pair screened cable (e.g., Belden 8761) for RS485 communication.
- Connect the "A" terminals together and the "B" terminals together using the twisted pair cable.
- Terminate the cable at each end with a 120 ohm resistor.
- Ensure proper grounding practices to reduce electrical interference.
2. **Modbus Protocol Configuration:**
- Set the baud rate to 2400, 4800, 9600, or 19200 baud.
- Configure the Modbus Protocol RTU slave protocol.
- Address each NMID30-1 meter with a unique value between 1 and 247.
- Ensure the Modbus Protocol function codes match the desired actions (e.g., read holding registers, read input registers, set multiple registers).
3. **Data Format and Transmission:**
- Data values are transferred as 32-bit IEEE754 floating-point numbers.
- Each parameter is held in two consecutive registers.
- Follow the specified byte order and error check field format for data transmission.
4. **ការដោះស្រាយបញ្ហា៖**
- Start with a simple network setup (one master and one slave) to test connectivity.
- Confirm correct wiring topology and address settings for each instrument.
- Ensure data requests do not exceed 40 parameters per transaction.
- Check Modbus Protocol mode, serial parameters, and floating-point byte order consistency.
- Verify the timeout settings and response times for effective communication.
5. **Function Codes and Data Handling:**
- Use function codes like 03 (Read Holding Registers), 04 (Read Input Registers), 08 (Diagnostics), and 15 (Pre-set Multiple Registers) as needed.
- Understand the IEEE floating-point format and how data values are represented in the registers.
ដោយអនុវត្តតាមជំហានទាំងនេះ និងយោងទៅ ម៉ែត្រថាមពល LUMEL NMID30-1 3 ដំណាក់កាល user manual for detailed instructions, you can successfully connect and configure the meter using Modbus Protocol over RS485 for efficient energy monitoring and management.
បន្ថែមមតិយោបល់ថ្មី។