1. Introduction
The R4IOJ32 is a versatile 32-channel RS485 multi-function IO core board designed by eletechsup. It supports various Input/Output (IO) configurations including 32DI, 32DO, 16DI-16DO, 8DI-24DO, and 24DI-8DO, with configurable NPN/PNP input and output levels. Its compact size and 2.54mm pin header interface make it ideal for embedding in PLC, HMI, and remote IO expansion systems.
2. Product Overview
The R4IOJ32 board is available in two versions: 'Only Board' (without pre-soldered pin headers) and 'With Pin' (with soldered pin headers for easier integration).
3. Specifications
| Feature | Description |
|---|---|
| Model Number | R4IOJ32 |
| Type | Module |
| Brand Name | eletechsup |
| Origin | Mainland China |
| Condition | New |
| Power Supply 1 | DC 6-25V (with anti-reverse protection) |
| Power Supply 2 | DC 3.3-5V (reverse connection prohibited) |
| Working Current | 10mA |
| MODBUS RTU Function Codes | Write: 05/06/15/16, Read: 01/02/03 |
| Configurable IO Modes | 32DI, 32DO, 16DI-16DO, 8DI-24DO, 24DI-8DO |
| Input/Output Level Switching | Via 0X00F5/0X00F6 registers (NPN/PNP) |
| Communication Abnormal Restart | Via 0X00F3 register |
| Close All Output Ports on Abnormal Communication | Via 0X00F4 register |
| Input Mode | Supports 3.3V/5V TTL level input (low level default, high level option) |
| Output Mode | 5V TTL level (low level default, high level option) |
| MODBUS Command Mode | Supports up to 247 devices in parallel |
| Input Port Status | Supports query (default) and automatic reporting |
| Baud Rates | 1200, 2400, 4800, 9600 (default), 19200, 38400, 57600, 115200 |
| Parity | None/Odd/Even |
| Interface | 2.54mm pin header |
| Dimensions | 51 x 33.5 x 3.8 mm |
| Weight | 8 grams |
4. Setup and Installation
4.1 Power Supply Connection
The R4IOJ32 board offers two power supply options. Only use one of the two power supplies at a time.
- Power Supply 1: DC 6-25V. This input features reverse connection protection.
- Power Supply 2: DC 3.3-5V. Reverse connection is prohibited for this input.
4.2 RS485 and IO Port Connections
Connect your RS485 communication lines to the designated RS485 Port. The IO ports are accessible via 2.54mm pin headers, allowing for easy connection using Dupont wires or breadboards.
5. Operating Instructions
5.1 MODBUS RTU Communication
The R4IOJ32 communicates using the MODBUS RTU protocol. Supported function codes are:
- Write Operations: 05 (Write Single Coil), 06 (Write Single Register), 15 (Write Multiple Coils), 16 (Write Multiple Registers)
- Read Operations: 01 (Read Coils), 02 (Read Discrete Inputs), 03 (Read Holding Registers)
The board supports various baud rates (1200 to 115200) and parity settings (None, Odd, Even). The default baud rate is 9600.
5.2 Input Port Status
Input port status can be queried (default behavior) or configured for automatic reporting.
6. Mode Configuration
The R4IOJ32 is a multi-function board, and its IO mode can be selected using jumpers (M1, M2, M3, M4). These jumpers utilize 0603 0Ω resistors or wire connections.
6.1 Detailed Pinout Diagrams for Each Mode
Refer to the following diagram for the specific pin assignments for each configurable IO mode:
7. Input/Output Level Configuration
The input and output levels (NPN/PNP) can be switched by modifying registers 0X00F5 and 0X00F6. The default configuration is NPN Input & NPN Output (0X00F5=0, 0X00F6=0).
8. Factory Reset
To restore the board to its factory settings, short the RES jumper for 5 seconds. Refer to Figure 2 for the location of the RES jumper.
9. Troubleshooting
- Communication Abnormal Restart: The board can be configured to restart automatically if communication becomes abnormal by setting the 0X00F3 register.
- Close Outputs on Communication Abnormal: You can configure the board to close all output ports when communication is abnormal by setting the 0X00F4 register.
10. User Tips
No specific user tips were available from provided reviews or Q&A content.
11. Warranty and Support
For detailed warranty information, technical support, or further documentation, please contact the manufacturer, eletechsup, or your point of purchase. Additional documentation may be available upon request.