Industrial Serial Device Servers

M4 series Serial Device Servers has features of industrial grade, multi-serial and high performance.M4 series Serial Device Servers are based on TI Cortex-M4 solution and its basic frequency can reach 120MHz.


  • 2, 4 and more serial ports supporting RS232/RS485
  • 10/100M auto-sensing Ethernet
  • -40 to 85° operating temperature range
  • Socket modes support TCP server/TCP client/UDP/Virtual COM
  • TCP Server mode supports up to 8 simultaneous connections
  • Static IP or DHCP
  • Modbus TCP, RTU Support
  • Cortex M4 class processor with on-chip Flash and SRAM
  • Support serial configure protocol, network configure protocel and WEB page configure

RS232 RS485 Ethernet Converter,Serial Ethernet to Modbus Converter

USR-TCP232-410S is Industrial M4 Series which support Modbus Gateway Modbus RTU to Modbus TCP. Top-rated item in the market.

  • RS232/RS485 (Can be used at one time)
  • DC 5-36v DC
  • Flow Control: CTS/RTS   XON/XOFF

DTR/DSR Serial Ethernet Converter, Ethernet to Serial

USR-TCP232-419 is DTR/DSR Serial Ethernet converter, ethernet to serial converter with modbus RTU function

  • Hardware Flow Control: CTS/RTS, DTR/DSR
  • Wide Voltage: 5-36v DC
  • Software control: XON/XOFF

4 ports Serial Device Servers, Serial RS232/RS485/RS422 to Ethernet Converter

USR-N540,a four serial device server,can realize transparent transmission between TCP/UDP data package and RS232/RS485/RS422 interface.

  • 4 serial port: RS-232/422/485 switch selectable
  • Low Voltage range of 9-24v DC
  • Data Rates range of 600~230.4kbps

RS232/RS485/RS422 Single Serial Ethernet Converter

USR-N510 is an industrial serial to ethernet converter to realize bi-directional transparent transmission between RS232/RS485/RS422 and network with modbus function

  • Three-in-one serial port, RS232/RS485/RS422
  • Modbus Gateway, Watchdog function
  • Flow control: CTS/RTS+XON/ XOFF

2 Serial port RS232/485/422 Ethernet Converter, Serial to Ethernet TCP/IP Converter

USR-N520 is a double serial device server,which can realize transparent transmission between TCP/UDP data package and RS232/RS485/RS422 interface.

  • 2 RS232/422/485 switch selectable serial port
  • Low Voltage range of 5~36v DC
  • Data Rates range of 600~230.4kbps