This Ethernet to serial converter, also known as an ethernet converter, is one of our most advanced and solid converters available of the two-port type. Not only does it have two RS232 ports but it also has individual RS485 and RS422 ports, allowing users to access attached devices over a network as if they were directly connected via a serial port. The RS232 ports are standard DB9 connector ports and the RS485 / RS422 ports have screw terminal headers for easy connection of single wires.
It supports communication protocols for most applications such as CNC machines, weighing scales, laboratory equipment, printers, factory automation and most other industrial applications. This converter allows remote access to devices as if they were connected using a direct cable connection, enhancing M2M communication capabilities.
The processor in this Ethernet to serial converter is a Wport-W20 processor from Ralink which provides reliable and solid performance with most applications. The embedded, high-performance CPU can easily manage advanced applications such as Ethernet data processing without overloading the host processor. The eCos operating system provides a strong platform supporting TCP/IP, Telnet, and Modbus TCP Protocols.
Besides supporting all standard basic functions such as baud rates between 300 and 230400bps, RS232, RS485, and RS422 interfaces, DHCP support, and AES security, it also supports more advanced functions. Here are some of the advanced functions (please refer to the datasheet for all details):
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Two Ethernet ports - LAN/WLAN
This converter can be accessed and communicate either over LAN or WLAN. Two different communication protocols in the same converter.
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Modbus compatible
Industrial applications often use the Modbus protocol to communicate with serial devices. This converter is fully compatible with the ModBus TCP and RTU protocols.
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Telnetd
Using standard Telnetd the Ethernet to serial converter can be accessed and communicate over a Telnet connection. Many network administrators prefer this method instead of web-access.
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Multiple TCP Sockets support
This converter can support up to 5 TCP sockets. Each socket can communicate individually over TCP/UDP in Server or Client mode. Multi Socket simultaneous communication of data stream is as following.
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Multiple Clients Support
Each serial port supports up to 8 simultaneous clients in TCP mode, meaning that 8 computers can connect to the converter at the same time. This is a nice feature to have if you have a large network with many clients.
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Configuration over serial (CLI)
The converter's parameters can be configured through the serial RS232 port using CLI commands. Useful if configuration through Wi-Fi or Ethernet is not an option.
- Other Special Functions:
Just to mention a few of the minor features:
- Wide power range 5 - 36VDC
- Adjustable number of simultaneous clients acceptable (max 32)
- HTTP support
- Route Configuration. The data received from Socket channel can be set to another socket channel
- NTP function
- Adjustable TCP socket Keep Alive
- Adjustable TCP socket Timeout
- Hardware flow control RTS/CTS
- Software flow control XON/XOFF
- Adjustable buffer size and gap time
- MAC address
- Adjustable timeout counter
- Please see the datasheet and user manual for more details.
Besides the features mentioned above, this converter is also fully capable of handling more complex setups such as Serial Tunneling mode, communication without virtual COM software, access over Internet, and more.

Overall features
- Solid Ralink processor
- eCOS operating system
- Industrial strength
- RS232, RS485 and RS422
- LAN and WLAN ports
- Advanced functions
- Free Virtual COM port software
- Modbus support
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Included items
- 1 x Converter module
- 1 x 100-240VAC/12VDC 1A power supply
- 1 x Ethernet cable
- 2 x Serial null modem cable (F/F)
- 1 x DC power cable (barrel
connector to stripped wires)
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| SPECIFICATIONS |
| Model number |
USC-HF5122 |
Operating system
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Virtual COM software for:
Windows 11 32/64-bit, Windows 10 32/64-bit, Windows 8 32/64-bit, Windows 7 32/64-bit |
| Processor |
Wport-W20,
Ralink
|
| Serial interface |
| Serial RS232 driver |
Sipex SP3232EEN |
| No. of serial ports |
2 port RS-232 male DB9
2 port RS485 screw terminals
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| RS-232 Signals |
- TX, RX, RTS, CTS, GND
- Parity: None, Odd, Even
- Data bits : 7, 8
- Stop bits : 1, 2 |
| Flow Control |
RS232: Hardware (RTS/CTS), Software (XON/XOFF)
RS485: Automatic Send Control, None |
| RS-485 Signals |
Data+ , Data-, GND |
| Baud rates |
300 - 230400 bps |
| Serial buffer size |
Adjustable 0 to 1024 kb |
| Ethernet interface |
| Ethernet port |
RJ45, 10/100 Base-T Auto-Negotiation, 8KV isolation |
| Number of Ethernet ports |
2 |
| Protocols |
TCP Server, TCP Client, UDP Client, UDP Server, HTTP Server/Client, DNS, DHCP, ARP, BOOTP, AutoIP, ICMP, Web socket, Telnet, uPNP, NTP, ModBus TCP |
| Security Protocol |
TLS v1.2
AES 128Bit
DES3 |
| Security |
WEP/WPAPSK/WPA2PSK |
| Max number of clients. This is how many computers that can access the converter simultaneously |
32 clients for each port in TCP mode. |
| Misc. |
| Parameter management |
Web-browser, Telnetd, software utility (over WiFi), CLI commands (through RS232 port) |
| Power |
5 - 36VDC (<700mW), 5.5mm x 2.5mm barrel connector |
| Operating Temp. |
-13°F to 176°F (-25°C to 80°C) |
| Storage Temp. |
-45 ~ 105°C, 5 ~ 95% RH(no condensation) |
| Working Current |
~200mA |
| Dimensions |
108 x 146 x 25 mm (L x W x H) |
| Weight |
396g |
| Approvals |
CE, FCC, ROHS |
| Warranty |
1 year Limited Warranty |
Useful optional accessories (not included)
What is Ethernet to Serial Devices?
Ethernet to Serial, also known as Serial to Ethernet conversion, is a technology that bridges the gap between Ethernet networks and serial devices. By converting Ethernet packets into serial data signals and vice versa, it allows serial devices to be accessed and controlled over an IP network. This technology is essential for integrating legacy serial devices with modern Ethernet networks, including various types of serial interfaces such as RS232, RS422, and RS485, thereby enhancing operational efficiency. The serial protocol plays a crucial role during the configuration phase, ensuring reliable communication between devices. With Ethernet to Serial converters, managing multiple serial devices over a single network interface becomes straightforward, streamlining communication and control processes.
Benefits of Ethernet to Multiple Serial Devices
The benefits of Ethernet to Serial conversion are numerous and impactful, especially when considering advanced ethernet solutions. Firstly, it enables remote access and control of serial devices over an IP network, providing flexibility and convenience. The use of virtual serial ports further enhances connectivity and remote management of serial devices over Ethernet. This technology also increases the scalability of network configurations, allowing for easy expansion and integration of new devices. Data transfer becomes more efficient and reliable, thanks to advanced protocols and error-checking mechanisms. Enhanced security features, such as encryption and authentication, ensure that data remains protected during transmission. Additionally, Ethernet to Serial conversion simplifies the connection and management of serial devices, reducing the need for additional hardware and cabling. Compatibility with various operating systems and network protocols further adds to its versatility, making it a valuable solution for diverse applications.
Ethernet to Serial Converters
Ethernet to serial converters are essential devices that bridge the communication gap between Ethernet networks and serial devices. By converting Ethernet packets into serial data signals, these converters enable serial devices to be seamlessly connected to an Ethernet network. This capability is particularly valuable in industrial automation, building automation, and various other applications where integrating serial devices with Ethernet networks is necessary.
One of the standout features of Ethernet to serial converters is their ability to handle different serial communication protocols, including RS-232, RS-422, and RS-485. This versatility ensures compatibility with a wide range of serial devices, making it easier to integrate multiple serial devices into a single Ethernet network. Additionally, these converters support various baud rates and data transmission speeds, allowing for efficient and reliable communication.
Flow control and control signaling are also critical aspects of Ethernet to serial converters. These features help manage the data flow between the Ethernet network and serial devices, preventing data loss and ensuring smooth communication. IP address configuration and web-based management further enhance the usability of these converters, allowing for easy setup and monitoring through a web interface.
In summary, Ethernet to serial converters are indispensable tools for modernizing legacy serial devices and integrating them into contemporary Ethernet networks. Their robust features and compatibility with various serial protocols make them a versatile solution for numerous applications, from industrial automation to building management systems.
Applications of Ethernet to Remote Serial Devices
Ethernet to Serial conversion finds applications across a wide range of industries, demonstrating its versatility and utility in managing serial port devices. In industrial automation and control systems, it facilitates the integration and management of various equipment and sensors. RS232 to Ethernet converters enable the transmission of serial data over wired or wireless Ethernet networks, ensuring reliable connectivity for devices with RS232, RS422, or RS485 interfaces. Medical devices and equipment benefit from reliable data transfer and remote monitoring capabilities. Security systems and access control solutions leverage this technology for efficient communication and control. Point-of-sale (POS) systems and retail applications use Ethernet to Serial converters to streamline transactions and inventory management. Laboratory equipment and scientific instruments rely on this technology for precise data collection and analysis. Additionally, it plays a crucial role in remote monitoring and control of industrial equipment, ensuring operational efficiency. In sensitive applications, secure data transfer and encryption are paramount, and Ethernet to Serial conversion provides the necessary safeguards.