eletechsup NT57B08 8-Channel Temperature and Resistance Acquisition Board

1. Prodott Aktarview

The eletechsup NT57B08 is a low-cost, high-performance 8-channel NTC temperature and resistance acquisition board. Designed for versatility, it can accurately measure both temperature values using NTC thermistors and resistance values ranging from 1K to 200K ohms. This board is an ideal solution for various applications including IoT, agricultural monitoring, and industrial control systems, leveraging the standard MODBUS RTU protocol for reliable communication.

Karatteristiċi ewlenin:

• Standard MODBUS RTU protocol for broad compatibility.
• Wide DC 7-25V operating voltagfirxa e.
• Configurable baud rates and parity settings.
• Temperature measurement range: -20°C to +125°C.
• Simultaneous measurement of temperature and resistance.
• Supports up to 8 channels for simultaneous testing.

2. Speċifikazzjonijiet

Figure 1: NT57B08 Board Overview and Key Specifications

NTC Sensor Specifications (Example: 4*25mm NTC Waterproof Probe)

• Product Name: 4*25mm NTC Waterproof Probe
• Total Length Options: 0.5M, 2M, 5M
• Resistance Value: 10K
• Resistance Accuracy: ±1%
• Resistance B Value: 3950 ± 1%
• Firxa tat-temperatura: -20°C sa 125°C
• Wire Size: 2651 26# parallel line, temperature rated 105°C
• Plug Model: Tinned tail
• Weight: 4g (0.5M), 13g (2M), 32g (5M)

Figura 2: Eżample NTC 10K 3950 1% Sensors (0.5M length)

3. Setup u Installazzjoni

This section details the physical connections and initial configuration required to set up your NT57B08 board.

3.1 Board Layout and Interfaces

Figure 3: NT57B08 Board Layout and Interface Descriptions

Refer to Figure 3 for the location of the following interfaces:

• Power Interface (GND, VIN): Connect DC 7-30V power supply.
• RS485 BUS Interface (A+, B-): Connect to your RS485 communication network. The board includes TVS surge protection.
• 8-Channel NTC Sensor Interface (T1- T1+ to T4- T4+ and T5- T5+ to T8- T8+): Connect your NTC thermistors or resistors here. Each channel has two terminals.
• RES Factory Setting Jumper: Used for factory settings; typically left untouched by the user.

3.2 Dijagrammi tal-Wiring

Ensure all connections are secure and correctly polarized where applicable. NTC sensors typically do not have polarity.

3.2.1 Temperature Measurement Wiring

Figure 4: 8CH Temperature Measurement Wiring Diagram

Kif muri fil-Figura 4:

1. Connect your DC 7-30V power supply to the GND and VIN terminals.
2. Connect your RS485 communication lines to the A+ and B- terminals.
3. Connect each NTC thermistor to a corresponding channel (e.g., T1- and T1+). Up to 8 NTC sensors can be connected.
4. Ensure NTC cable length is within 10 meters for optimal performance. NTC sensors do not have polarity.

3.2.2 Resistance Measurement Wiring

Figure 5: 8CH Resistance Measurement Wiring Diagram

Kif muri fil-Figura 5:

1. Connect your DC 7-30V power supply to the GND and VIN terminals.
2. Connect your RS485 communication lines to the A+ and B- terminals.
3. Connect each resistor (within the 1K-200K ohm range) to a corresponding channel (e.g., T1- and T1+). Up to 8 resistors can be connected.

3.3 Modbus RTU Configuration

The NT57B08 communicates using the Modbus RTU protocol. Before operation, ensure your Modbus master device (e.g., PLC, microcontroller, PC with Modbus software) is configured to match the board's settings:

• Rata Baud: Default is 9600BPS. Can be changed via Modbus command to 2400, 4800, 19200, 38400, 57600, or 115200BPS.
• Parità: Default is NONE. Can be changed via Modbus command to EVEN or ODD.
• Indirizz tal-iskjavi: The default slave address is usually 01. This can also be configured via Modbus command.

Consult the Modbus RTU protocol documentation for specific register addresses and commands to read data or change settings. The board supports function codes 03 (Read Holding Registers), 04 (Read Input Registers), 06 (Write Single Register), and 16 (Write Multiple Registers).

4. Istruzzjonijiet Operattivi

Once the NT57B08 board is powered and connected to your Modbus master, you can begin acquiring data.

4.1 Data Acquisition via Modbus RTU

To read temperature or resistance values, send Modbus RTU commands from your master device to the NT57B08 (slave device). The specific register addresses for temperature and resistance readings will be detailed in the board's Modbus register map (refer to the product's full technical documentation for this map).

• Use Modbus function code 03 or 04 to read the holding or input registers where the sensor data is stored.
• The data will typically be returned as raw sensor readings or scaled values, which may require conversion based on the NTC thermistor's characteristics (B-value, resistance at 25°C) or the resistance value.

4.2 Issettjar tal-Parametri

Baud rate, parity, and slave address can be changed by writing to specific Modbus registers using function code 06 or 16. Always ensure that after changing communication parameters, your Modbus master is updated to match the new settings to maintain communication.

5. Manutenzjoni

The NT57B08 board is designed for robust operation with minimal maintenance. Follow these guidelines to ensure longevity and reliable performance:

• Kundizzjonijiet Ambjentali: Operate the board within its specified temperature and humidity ranges. Avoid exposure to extreme temperatures, moisture, or corrosive environments.
• Tindif: If necessary, gently clean the board with a soft, dry brush or compressed air to remove dust. Do not use liquids or solvents.
• Konnessjonijiet: Periodically check all wiring connections to ensure they are secure and free from corrosion. Loose connections can lead to intermittent operation or inaccurate readings.
• Provvista tal-Enerġija: Ensure a stable power supply within the DC 7-25V range. Voltage fluctuations outside this range can damage the device.

6 Issolvi l-problemi

If you encounter issues with your NT57B08 board, consider the following troubleshooting steps:

• Ebda Komunikazzjoni:
  • Verify power supply is connected correctly and within the 7-25V DC range.
  • Check RS485 A+ and B- connections for correct polarity and continuity.
  • Ensure the Modbus master's baud rate, parity, and slave address match the NT57B08's settings.
  • Confirm the RS485 network has proper termination resistors if needed (typically 120 ohms at each end of the bus).
• Qari mhux eżatt:
  • Check NTC sensor or resistor connections for looseness or damage.
  • Ensure the correct NTC thermistor type (10K B3950 1%) is used if measuring temperature.
  • Verify the NTC sensor cable length is within the recommended 10 meters.
  • Confirm the Modbus master is correctly interpreting the raw data from the board (e.g., applying the correct scaling or conversion formulas).
  • Check for electromagnetic interference (EMI) if readings are erratic. Use shielded cables for RS485 if necessary.
• Il-Bord Mhux Mixgħul:
  • Double-check power supply voltage u l-kapaċità kurrenti.
  • Inspect for any visible damage to the board or power input terminals.

7. Għajnuniet għall-Utenti

• For long-term stability and accuracy, consider calibrating your NTC sensors periodically, especially in critical applications.
• When integrating into a larger system, always test the Modbus communication and data acquisition with a single sensor before deploying all 8 channels.
• If using in an environment with significant electrical noise, ensure proper grounding and consider using shielded RS485 cables to prevent interference.
• The board's compact size makes it suitable for DIN rail mounting when enclosed in the optional DIN case, facilitating integration into industrial control panels.

8. Garanzija u Appoġġ

This product is manufactured by eletechsup. For technical support, detailed Modbus register maps, or warranty inquiries, please refer to the official eletechsup support channels or contact your vendor. Keep your purchase records for any warranty claims.