1. Product Overview
The waveshare RS232/485/422 to RJ45 Ethernet Converter is an industrial-grade isolated serial server designed for reliable bi-directional data transmission between RS232/485/422 serial devices and Ethernet networks. It supports Power over Ethernet (PoE) functionality, offering flexible power supply options and robust communication modes for various industrial applications.
Figure 1.1: Front view of the Waveshare RS232/485/422 to RJ45 Ethernet Converter, showing the Ethernet port, serial ports, and power input.
Figure 1.2: Diagram illustrating key features including industrial isolation, rail-mount capability, Modbus Gateway, MQTT & JSON support, multi-host support, multiple interfaces, three power supply methods, and host/webpage configuration.
2. Key Features
- Versatile Connectivity: Supports RS232, RS485, and RS422 interfaces for broad compatibility with serial devices.
- Ethernet Integration: RJ45 Ethernet port with 10/100M auto-negotiation and 2 KV surge protection.
- Power over Ethernet (PoE): Complies with IEEE 802.3af standard for convenient power supply via Ethernet cable.
- Flexible Power Input: Supports DC 6~36V wide voltage range via screw terminal or DC power port.
- Industrial Isolation: Features power isolation and signal isolation for enhanced reliability in harsh environments.
- Modbus Gateway Support: Facilitates Modbus networking upgrades and integration with Modbus RTU/TCP.
- Multi-Communication Modes: Supports TCP Server, TCP Client, UDP, and UDP Multicast operating modes.
- Protocol Conversion: Flexible conversion between different protocols, including MQTT/JSON to Modbus.
- Advanced Functions: Includes Multi Hosts Roll-Polling, User-Defined Heartbeat/Registration Packet, and NTP Protocol Support.
- Multiple Configuration Methods: Configurable via host software, web browser, or device management functions library.
- Durable Design: Aluminium alloy enclosure with sand blasting and anodic oxidation for solid and durable construction.
- Rail-Mount Support: Designed for easy rail-mounting in industrial setups.
3. Specifications
| Category | Parameter | Value |
|---|---|---|
| Product Type | Function | Serial server, Modbus Gateway, MQTT Gateway |
| Primary Function | Data Transmission | Bi-directional transparent data transmission between RS232/485/422 and Ethernet |
| Communication Interface | RS232 Port | 1 |
| RS485 Port | 1 | |
| RS422 Port | 1 | |
| Ethernet Port | 1 (PoE, IEEE 802.3af, 10/100M auto-negotiation, RJ45, 2 KV surge protection) | |
| Power Supply | Input Voltage | DC 6 ~ 36V (screw terminal or PoE port) |
| Isolation Protection | Power isolation, Signal isolation | |
| Serial Parameters | Baud Rate | 300 ~ 115200 bps |
| Parity Bit | None, Odd, Even, Mark, Space | |
| Data Bits | 5 ~ 9 bits | |
| Flow Control | No flow control | |
| Software | Protocols | ETHERNET, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP, DNS |
| Configuration Method | Host, Web browser, Device management functions library | |
| Communication Method | TCP/IP direct communication, VCOM | |
| Operating Mode | TCP server, TCP client (coexisting with TCP server), UDP, UDP multicast | |
| Operating Temperature | Range | -40℃ ~ 85℃ |
| Humidity Range | Relative Humidity | 5% ~ 95% |
| Dimensions | L × W × H | 88.7 × 64.5 × 24.2 mm (3.49 x 2.85 x 0.95 inches) |
| Weight | Item Weight | 5.6 ounces |
| Model Number | Manufacturer Model | RB-Wav-734 |
4. Package Content
The following items are included in the product package:
- RS232/485/422 TO POE ETH (B) Converter x1
5. Setup and Installation
5.1 Power Supply Options
The device offers three methods for power supply:
- PoE (Power over Ethernet): Connect an Ethernet cable from a PoE-enabled switch or injector to the RJ45 Ethernet port. The device supports IEEE 802.3af standard.
- DC Power Port: Connect a DC power adapter (6~36V) to the DC power jack.
- Screw Terminal: Connect a DC power source (6~36V) to the screw terminal block. Ensure correct polarity (VCC and GND).
Figure 5.1: Illustration of the PoE Ethernet port, DC power port, and screw terminal for power input, along with diagrams showing bi-directional data transmission between serial and Ethernet interfaces.
5.2 Rail-Mount Installation
The converter is designed for easy installation on a DIN rail. Locate the rail-mount buckle on the device and securely attach it to a standard DIN rail in your industrial setup.
Figure 5.2: Image demonstrating the rail-mount buckle for easy integration into industrial environments, alongside details of the aluminum alloy enclosure and multiple protection features.
5.3 Interface Connections
Identify the following interfaces on the device:
- RS232 Port: Standard DB9 male connector for RS232 serial communication. Refer to the pinout diagram for correct wiring.
- RS485/RS422 Port: Screw terminal block for RS485 (A, B) and RS422 (TX+, TX-, RX+, RX-) connections.
- PoE Ethernet Port: RJ45 connector for network and optional PoE power.
- Reset Button: Small button for resetting the device to factory defaults or restarting.
Figure 5.3: Detailed view of the device interfaces including the RS232 port, PoE Ethernet port, DC power port, 6-36V power input, ground, signal ground, RS485/RS422 terminals, and reset button. Also includes outline dimensions and RS232 pinout definition.
RS232 Pinout Definition
| DB9 Male (PIN) | RS232 PIN |
|---|---|
| 2 | (RXD) |
| 3 | (TXD) |
| 5 | GND |
| 1, 4, 6, 7, 8, 9 | N/C |
6. Operating Instructions
6.1 Configuration Methods
The device can be configured using multiple methods:
- Host Software: Use the dedicated configuration software provided by waveshare to set up network parameters, serial parameters, and operating modes.
- Web Browser: Access the device's web interface by entering its IP address in a web browser. This method supports obtaining dynamic IP via DHCP and DNS protocol support.
- Device Management Functions Library: For advanced integration, utilize the provided functions library.
Figure 6.1: Diagram illustrating multi-configuration methods via host software, web browser, and device management functions library, along with concepts like Multi Hosts Roll-Polling, User-Defined Heartbeat/Registration Packet, and NTP Protocol Support.
6.2 Communication Modes
The converter supports various communication modes to suit different network topologies and application requirements:
- TCP Server: The device acts as a TCP server, listening for incoming connections from TCP clients. It supports up to 30 TCP connections simultaneously.
- TCP Client: The device initiates a TCP connection to a specified TCP server. It can coexist with TCP server mode.
- UDP: The device sends and receives UDP packets. This mode is suitable for multi-network device communication.
- UDP Multicast: Supports sending data to a group of devices simultaneously.
Figure 6.2: Visual representation of TCP Server, TCP Client, UDP Server, and UDP Client communication modes, along with Modbus Gateway support and MQTT/JSON to Modbus conversion.
6.3 Modbus Gateway Functionality
The device functions as a Modbus Gateway, enabling seamless integration of Modbus RTU/ASCII devices into Modbus TCP networks. It is suitable for Modbus networking upgrades and can be configured using specific software.
6.4 MQTT/JSON to Modbus Conversion
For enhanced flexibility, the converter supports MQTT/JSON to Modbus conversion. This allows data from cloud platforms (e.g., Baidu Cloud MQTT, Alibaba Cloud MQTT) or JSON formatted data to be parsed and converted into Modbus packets for uploading or integration with Modbus devices.
6.5 Multi Hosts Roll-Polling
This feature allows the device to identify and respond to different network devices respectively, preventing crosstalk issues when communicating with multiple network devices.
6.6 User-Defined Heartbeat/Registration Packet
Configure custom heartbeat and registration packets for easy cloud communication and device identification on the network.
6.7 NTP Protocol Support
The device supports NTP (Network Time Protocol) for obtaining accurate network time information, which can be useful for data logging and synchronization.
7. Maintenance and Troubleshooting
7.1 General Maintenance
- Keep the device in a clean, dry environment within the specified operating temperature and humidity ranges.
- Ensure proper ventilation around the device to prevent overheating.
- Regularly check cable connections for secure fit and signs of damage.
- Clean the exterior of the device with a soft, dry cloth. Do not use liquid cleaners.
7.2 Troubleshooting Common Issues
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not powering on | No power supply; Incorrect voltage; Faulty cable/PoE source. | Verify power connection and voltage (6-36V DC). Check PoE source if using PoE. Try a different power method. |
| No network connectivity | Ethernet cable disconnected/damaged; Incorrect IP settings; Network configuration issue. | Check Ethernet cable. Verify device IP address and network settings using configuration software or web interface. Ensure network switch/router is functioning. |
| Serial communication failure | Incorrect serial port settings (baud rate, parity, data bits); Incorrect wiring; Device not in correct operating mode. | Verify serial parameters match the connected device. Check RS232/485/422 wiring. Ensure the device is in the appropriate TCP/UDP operating mode. |
| Device unresponsive | Software glitch; Configuration error. | Press the reset button to restart the device. If issues persist, perform a factory reset (refer to manual for specific procedure) and reconfigure. |
8. Safety and Protection
The device incorporates multiple protection mechanisms to ensure safe and stable operation:
- Digital Isolation: Isolates digital signals to prevent interference.
- ESD Protection: Electrostatic Discharge protection to prevent damage from static electricity.
- Over-current Protection: Protects against excessive current flow.
- Over-voltage Protection: Safeguards against voltage spikes.
- TVS (Transient Voltage Suppression) Tube: Effectively suppresses surge voltage and transient peak voltage in the circuit, enhancing lightning protection and ESD resistance.
- Built-in Resettable Fuse and Protection Diode: Ensures stable output current and voltage, preventing over-current and over-voltage.
Figure 8.1: Diagram highlighting digital isolation, ESD protection, over-current protection, over-voltage protection, and TVS protection, along with the durable aluminum alloy enclosure.
9. Warranty and Support
For development resources and technical support, please contact waveshare customer service. Information regarding warranty terms and conditions can typically be found on the manufacturer's official website or by contacting their support team directly.
Figure 9.1: Illustration of waveshare's support for batch customization, including label, hardware, and software customization, indicating comprehensive manufacturer support.
