1. Introduction
The eletechsup N4DIG08 is a versatile 3-in-1 8-channel digital switch module designed for industrial automation and smart home applications. It supports TTL, LVTTL, and CMOS logic levels and communicates via RS485 using the Modbus RTU protocol. This module can be configured for 8-channel input, 8-channel output, or 4-channel input/4-channel output modes, making it suitable for various PLC and relay control systems.
2. Package Contents
Your package should contain:
- 1 x N4DIG08 8-channel Multifunction Input/Output Module (version as selected: No Pin, With Pin, or With Terminals)
3. Specifications
| Feature | Description |
|---|---|
| Model Number | N4DIG08 |
| Working Voltage | DC 12V (6-24V) |
| Working Current | 10-16mA |
| Control Mode | MODBUS RTU 03 06 16 command |
| Functional Modes | 8-channel input / 8-channel output / 4 input 4 output (jumper selectable) |
| Input Mode | 3.3V/5V TTL level input (low level default, high level configurable) |
| Output Mode | 5V TTL level (low level default / high level output) |
| MODBUS Device Support | Up to 247 devices in parallel |
| Input Port Status | Supports query (default) and automatic reporting |
| Baud Rate | Default 9600BPS (configurable to 1200, 2400, 4800, 19200) |
| Dimensions | 44 x 31 x 15 mm |
| Weight | 9g (no Pin), 10g (with Pin), 12.5g (with Terminals) |
| Power Source | DC |
| Contact Load | Low Power |
| Use | PCB |
| Protect Feature | Sealed |
| Bus Interface | RS485 |
4. Setup and Configuration
The N4DIG08 module offers three functional modes, which are selected by configuring jumpers on the board. Refer to the diagram below for jumper settings.
4.1 Jumper Settings
| Function | Jumper Welding (M2, M1, M0) | Channels |
|---|---|---|
| 8 Input | M2=0, M1=0, M0=0 (Default Mode) | 1-8 Channels are all inputs |
| 8 Output | M2=1, M1=0, M0=0 | 1-8 Channels are all outputs |
| 4 Input / 4 Output | M2=1, M1=1, M0=0 | 1-4 Channels are inputs, 5-8 Channels are outputs |
Ensure the module is powered off before changing jumper settings.
5. Operating Modes
The N4DIG08 module supports three primary operating modes based on jumper configuration:
5.1 8-Channel Input Mode
In this mode, all 8 channels (IN1-IN8) function as digital inputs. It supports 3.3V/5V TTL level signals. The default input mode is low level, but it can be configured for high level input via a configuration register.
5.2 8-Channel Output Mode
When configured for 8-channel output, all 8 channels (OUT1-OUT8) provide 5V TTL level output. The default output is PNP low level, with NPN high level output configurable via a configuration register. This mode is suitable for driving relay solenoid valve circuits.
5.3 4 Input / 4 Output Mode
This hybrid mode utilizes channels 1-4 as digital inputs (IN1-IN4) and channels 5-8 as digital outputs (OUT5-OUT8). This configuration is ideal for applications requiring both input sensing and output control from a single module.
6. Wiring Diagrams
Proper wiring is crucial for the correct operation of the N4DIG08 module. Please follow the diagrams carefully for your chosen operational mode.
6.1 8-Channel Input Wiring Diagram
6.2 8-Channel Output Wiring Diagram
6.3 4 Input / 4 Output Wiring Diagram
6.4 RS485 Communication Wiring
The N4DIG08 module communicates via RS485. Multiple modules can be daisy-chained, each with a unique Slave ID (1 to 247).
7. Modbus RTU Commands
The N4DIG08 module operates using MODBUS RTU commands (03, 06, 16). In MODBUS command mode, you can set different "Slave ID" for each module, allowing up to 247 devices to be used in parallel on a single RS485 bus. The input port status supports both query (default) and automatic reporting. The default baud rate is 9600BPS, which can be configured to 1200, 2400, 4800, or 19200 BPS.
For detailed Modbus RTU instruction sets and register maps, please contact the seller after purchase as a specific manual is mentioned to be available upon request.
8. User Tips
- Always ensure the module is powered off before making any changes to jumper settings or wiring connections to prevent damage.
- When connecting multiple modules via RS485, assign a unique Slave ID to each module to ensure proper communication.
- For optimal performance and signal integrity, use appropriate shielded cables for RS485 communication, especially over longer distances.
9. Troubleshooting
- Module not responding: Check power supply (6-24V DC) and RS485 connections (A+ to A+, B- to B-). Verify the baud rate and Slave ID settings match your controller.
- Incorrect input/output behavior: Ensure the jumpers are correctly set for the desired operational mode (8 Input, 8 Output, or 4 Input/4 Output). Confirm input/output signal levels are compatible (3.3V/5V TTL).
- Communication errors: Check for proper termination resistors on the RS485 bus if experiencing issues over long distances or with many devices. Ensure no duplicate Slave IDs are present on the bus.
10. Maintenance
The N4DIG08 module is designed for reliable operation with minimal maintenance. Keep the module clean and free from dust and moisture. Avoid exposing it to extreme temperatures or corrosive environments. Periodically check wiring connections for looseness or damage.
11. Warranty and Support
For any technical assistance, detailed Modbus RTU command documentation, or warranty inquiries, please contact the seller directly. Ensure you have your purchase details readily available.