$62.00 USD

● Serial Port: 2xports of RS232/RS485/RS422,can be used simultaneously

● Redundant Power supply: DC 5-36V or Terminal power supply

● Modbus Gateway: Modbus RTU to Modbus TCP, Modbus Polling

● Work mode: TCP Server/Client, UDP Server/Client, HTTPD Client

● Flow control XON/XOFF

● Serial to Web, 2 sockets

● Configuration by Webpage, AT command and Setup software

Qty available: 0 SKU:USR-N520

Basic Function of Serial to Ethernet Servers

Industrial Hardware Design

Industrial solution TI cortex-M4

Watch dog

Hardware watchdog design,
never crash in 24 hours

Serial Ports

Baud rate: 600bps~230.4Kbps
Hardware flow control: RTS/CTS
Software flow control: XON/XOFF
Serial data can be divided into frames flexibly

Serial Port Switching Among RS232/RS485/RS422

Power supply supports Anti-reverse

Wide voltage: 5~36V

Function Structure

Work mode

TCP Server

Serial to Ethernet servers USR-N520 listens on the setting port
and waits for a TCP client connection.
The data which the serial ports sent out transparently
transmit to all connected TCP clients via USR-N520.

TCP client mode

Serial to Ethernet servers USR-N520 initiates a TCP connection to the set IP address.If the connection fails, USR-N520 will keep trying to reconnect until it succeeds.Once the connection is successful, the data will be transparently
transmitted between PC and serial device in bi-directional.

UDP mode

Serial to Ethernet servers USR-N520 will transmit serial data from serial device to
target network device by UDP connection.
USR-N520 will listen to port and transmit all received data to serial device.

httpsD Client

Supports https Client mode which can transmit serial data to the https server in https format(GET/POST).


Supports WebSocket Sever,Built Websocket link with devices by Websocket of webpage HTML5
Data transmission between built-in webpage and serial port in bi-directional. Custom webpage and websocket are acceptable. Achieves the functions of displaying data in real-time

Virtual Com Software


Socket B function

Serial to Ethernet servers USR-N520 supports the secondary network link, which can send data to two servers.
Used for data backup, remote diagnosis, and other requirements.

Serial & Network Heartbeat Packet

Network Heartbeat Packet: Serial server maintains the normal connection with the server by sending heartbeat packet regularly. Serial Heartbeat Packet: Serial server informs serial device is active, can be applied in actively catching sensor data.

Support modbus gateway

More function

Customize webpage, Synchronized baud rate,
net printing, registration package, cloud

Unattended Weighing System

Connect serial to Ethernet servers USR-N520 to barrier gate and it can realize remote control of barrier gate by Ethernet in control center.
System Information
Basic Frequency120MHz
Flash512K byte
Port Number1
Interface StandardRJ45
Rate10/100 Mbps MDI/MDIX, auto switch between cross and direct connection
Protection2KV electromagnetism isolation, shell insulation blocking
Network ProtocolIP, TCP, UDP, DHCP, DNS, https, ARP, ICMP, Websocket, httpsD Client
Receive BufferMax 16k bytes buffer
Port Number2 (RS232/485/422*2), 2 serial ports can simultaneously work at the different working modes.
Interface Standard
RS-485: A+/B- 
RS422: TX+/TX-/RX+/RX-
Data Bits5, 6, 7, 8
Stop Bit1, 2
Check BitNone, Even, Odd, Space, Mark
Baud Rate600 bps ~ 230K bps
Flow ControlRTS/CTS/Xon/Xoff
BufferSend and receive 2k bytes respectively
ProtectionESD protection, anti-surge
Transparent Transmission ModeTCP Server/TCP Client/UDP Server/UDP Client
Supported FunctionNetworking printing, Modbus Gateway, USR-Cloud, self-defined registration package, self-defined network and serial heartbeat package
SocketBTCP Client/UDP Client
Virtual Serial(USR-VCOM)Windows 2000 or higher (32 bit/64 bit)
ConfigurationBuilt-in webpage, computer set-up software, serial command
Basic Parameter
Size150 x 79 x 30 mm
Operating Temp.-40 ~ 85°C
Storage Temp.-45 ~ 105°C, 5 ~ 95% RH
Input VoltageDC 5 ~ 36V
Working Current
95mA (aver) @ 5V
45mA (aver) @ 12V
CertificateCE, FCC, ROHS, KCC and WEEE pending
Warranty2 years
Accessory12V power supply, serial line, cable, converter