1. Киришүү
The eletechsup N438B08 is an 8-channel RS485 relay module designed for industrial automation, smart home systems, and various control applications. It operates on 12VDC and supports MODBUS RTU commands, allowing for flexible control of up to 8 independent relays. This manual provides essential information for the proper installation, configuration, and operation of the module.
2. Продукт бүтүп калдыview
2.1 Негизги өзгөчөлүктөрү
- Working voltagд: DC 12V
- Enhanced RS485 interface protection (TVS)
- Supports ''open'', ''close'', ''Momentary'', ''Self-locking'', ''Interlock'', ''Delay'' 6 commands
- MODBUS RTU command support (03, 06, 16 function codes)
- Maximum delay of 255 seconds under ''Delay'' command
- MODBUS commands can be entered via serial HyperTerminal or ''Modbus Poll''
- Supports up to 64 devices in parallel under MODBUS command mode
- Adjustable baud rate: 2400, 4800, 9600 (default), 19200BPS
2.2 Модулдун макети
Сүрөт 1: Алдыңкы view of the N438B08 module, indicating 8 relay channels (CH1-CH8), power, RS485 interface, and individual relay status LEDs. Each channel has Normally Open (NO), Common (COM), and Normally Closed (NC) terminals.
2-сүрөт: Каптал view of the N438B08 module, detailing the power input terminals (GND, VIN) and the screw terminals for the 8 relay outputs (NOx, COMx, NCx).
3. Орнотуу
3.1 Кубат туташтыруу
Connect a DC 12V power supply to the VIN and GND terminals on the module. Ensure correct polarity to prevent damage.
3.2 RS485 туташуусу
Connect the RS485 A+ and B- terminals of the module to your RS485 master device (e.g., PLC, industrial PC, or USB-to-RS485 converter). The module features enhanced RS485 interface protection (TVS) for robust communication.
3.3 Relay Output Connections
Each of the 8 relays provides Normally Open (NO), Common (COM), and Normally Closed (NC) contacts. Connect your load devices to the appropriate terminals based on your application requirements. The maximum load for each relay is 10A at 250VAC, 10A at 125VAC, 10A at 30VDC, 10A at 28VDC, or 10A at 12VDC.
3.4 Baud Rate Selection
The default baud rate is 9600BPS. The baud rate can be adjusted using jumpers on the module. Refer to the module's markings or specific documentation for jumper configurations for 2400, 4800, 9600, and 19200BPS.
4. Иштөө нускамалары
4.1 MODBUS RTU Commands
The N438B08 module operates using MODBUS RTU commands. It supports function codes 03 (Read Holding Registers), 06 (Write Single Register), and 16 (Write Multiple Registers).
4.1.1 Relay Control Commands
The module supports various relay control modes:
- Ачык: Deactivates the relay.
- Жабуу: Activates the relay.
- Убактылуу: Activates the relay for a brief period, then deactivates.
- Өзүн-өзү кулпулоо: Toggles the relay state with each command.
- блокировка: Ensures only one relay in a group is active at a time.
- Кечигүү: Activates the relay for a specified duration (up to 255 seconds).
4.1.2 MODBUS Register Map
The following table details the MODBUS registers for controlling and monitoring the N438B08 module:
Figure 3: MODBUS Register Map. This table outlines the address codes, function codes (03, 06, 16), register addresses, and their corresponding functions for controlling output ports, reading status, performing factory resets, setting delay times, and configuring baud rates and slave IDs.
For detailed command structures and examples, refer to the MODBUS RTU protocol specification and the specific register values provided in the table above.
4.2 Программалык камсыздоонун интерфейси
MODBUS commands can be sent to the module using serial communication software such as HyperTerminal (serial assistant) or dedicated MODBUS polling software like ''Modbus Poll''. Configure the software with the correct COM port, baud rate, data bits, parity, and stop bits (typically 8N1).
4.3 Параллель иштөө
In MODBUS command mode, the N438B08 module supports connecting up to 64 devices in parallel on a single RS485 bus. Each module must have a unique Slave ID, which can be configured via DIP switches or MODBUS registers (refer to the MODBUS Register Map).
5. Техникалык шарттар
- Модел: N438B08
- Working Voltage: DC 12V
- Standby Current (all relays closed): 12мА
- Current Consumption (per relay open): Approximately 28mA additional per relay (e.g., 1 relay open: 40mA, 8 relays open: 224mA)
- RS485 Protection: Enhanced TVS protection
- Колдоого алынган буйруктар: Open, Close, Momentary, Self-locking, Interlock, Delay
- MODBUS Function Codes: 03, 06, 16
- Максималдуу кечигүү: 255 seconds (for Delay command)
- Parallel Devices: Up to 64 (in MODBUS command mode)
- Бауд ылдамдыгы: 2400, 4800, 9600 (default), 19200 BPS (selectable via jumpers)
- Өлчөмдөрү: 145 x 90 x 40 мм (5.71 x 3.54 x 1.57 дюйм)
- Салмагы: 218г (7.69 унция)
- Максималдуу жүк: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC
6. Тиркемелер
The N438B08 module is suitable for a wide range of applications, including:
- PLC Output expansion boards
- Smart Home and Home Automation systems
- PTZ CCTV Camera control
- Security Monitoring Identification systems
- Motor Forward & Reverse control
- Automatic curtain control
- General industrial control systems
7. Кыйынчылыктарды
- Кубат жок: Verify the 12VDC power supply connection and ensure correct polarity. Check the power indicator LED on the module.
- Байланыш маселелери:
- Check RS485 wiring (A+ to A+, B- to B-).
- Ensure the baud rate setting on the module (jumpers) matches the software configuration.
- Verify the Slave ID of the module is unique and matches the command.
- Confirm the serial port (COM port) is correctly selected in your software.
- Реле иштетилбейт:
- Check the load connections to the NO/COM/NC terminals.
- Ensure the load voltage and current do not exceed the relay's maximum ratings.
- Verify the correct MODBUS command is being sent to the specific relay channel.
- Үзгүлтүксүз иштөө: Check for loose connections, power supply fluctuations, or electromagnetic interference. Ensure proper grounding.
8. Техникалык тейлөө
The N438B08 module is designed for reliable operation with minimal maintenance. Keep the module clean and free from dust and moisture. Periodically check all wiring connections for tightness and integrity. Avoid exposing the module to extreme temperatures or corrosive environments.
9. Кепилдик жана колдоо
For warranty information and technical support, please refer to the documentation provided at the time of purchase or contact eletechsup customer service through their official channels. Please provide your product model (N438B08) and purchase details when seeking support.