Serial to Ethernet Converter, 2 ports

USR-N520 is a 2 Ports Serial to Ethernet Converter, which can realize transparent transmission between TCP/UDP data package and RS232/RS485/RS422 interface.

  • 2 serial ports, RS232 RS485 RS422 three-in-one
  • Voltage range of 5~36v DC
  • Modbus RTU to Modbus TCP, CTS/RTS, XON/XOFF
  • 2 serial port can works simultaneously

Work mode

TCP Server
Serial server device 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 client via serial device USR-N540.

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

UDP mode
Serial device server will transmit serial data from serial device to target network device by UDP connection. Serial device server will listen to port and transmit all received data to serial device.

HTTPD Client
Supports HTTP Client mode which can transmit serial data to the HTTP server in HTTP 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


System Information
Basic Frequency120MHz
Flash512K byte
Port Number
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, HTTP, ARP, ICMP, Web socket, Httpd client
Receive BufferMax 16k bytes buffer
Port Number2 (RS232/485/422*2), 2 serial ports can simultaneously work at the different working modes.
Interface StandardRS-232: TX/RX/RTS/CTS
RS-485: A+/B-
RS422: TX+/TX-/RX+/RX-
Data Bits5, 6, 7, 8
Stop Bit1, 2
Check BitNone, Even, Odd, Space, Mark
Baud Rate600bps ~ 230Kbps
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 Current95mA (aver) @ 5V
45mA (aver) @ 12V
CertificateCE, FCC, ROHS, KCC and WEEE pending
Warranty2 years
Accessory12V power supply, serial line, cable, converter

Request a Quote