RS232/RS485 to Ethernet Interface Converter, 4 Port, Industrial M2M, USR-N540


Out of stock

SKU: USR0-540Code: USR-N540

US$ 120.69

Out of stock


This is a quality device from USR. Their products are known for their quality, good documentation and easy to use software.

The USR-N540 is a 4 Port Serial RS232/RS485 to Ethernet Interface Converter. It supports Modbus RTU and Modbus TCP. It can be used for transparent transmissions between TCP/UDP data packages and RS232/RS485/RS422 interface. Configuration can be done via built-in webpages, computer set-up software, or serial commands. This device is very well built, and is supplied in a sturdy metal enclosure. It is manufactured with high quality components, and the latest PCB assembly techniques. 

This product consists of the following:
  1 x Genuine USR-N540
  4 x DSUB to 5 pin terminal block adapters
  1 x Australian Wall Mount Power Supply, 5V, 1A, 2.1mm Connector

Additional information is available on USR's product site.

Additional information is available on

This product will be shipped via eParcel from Sydney (except if you upgrade to express post during checkout).


  • Support Modbus RTU to Modbus TCP
  • 4 Serial ports (RS-232/422/485) can work independently at the same time
  • Each serial port can work as RS232, RS485 or RS422
  • Four channel serial communication indicator: TX/RX, CTS/RTS, XON/XOFF
  • Serial baud rate from 600bps to 230.4K bps
  • Serial ports available on standard DSUB connectors, or via a terminal block.
  • Auto-MDI/MDIX, RJ45 port with 10/100Mbps
  • TCP Server, TCP Client, UDP Client, UDP Server and HTTPD Client working modes
  • DNS and DHCP supported
  • UDP broadcast supported
  • Supports one channel Websocket
  • Supports Virtual Serial Ports and provide corresponding software USR-VCOM
  • Provide PC TCP/IP socket programming example such as VB,C++,Delphi,Android and IOS
  • Configuration via built-in webpages, webpages can also be customize
  • Supports upgrading firmware via network
  • Supports keepalive, rapidly detect dead links
  • Supports account and password access for network settings
  • Reload button, one key to restore default settings
  • ESD 8KV Protection on Serial/Etherent port
  • RJ45 with Link/Data indicator light,built-in isolation transformer and 2 KV electromagnetic isolation
  • Can be powered via a 2.1mm Power Socket, or a standard 5.08mm, 2 pin terminal block connector.
  • Supply voltage range 5V to 36V with built in anti-reverse, anti-surge and anti-pulse protection.

Typical Applications

  • Industrial data transmission, industrial automation
  • Security and protection monitoring, public security
  • Smart home, power control, environmental monitoring, intelligent agriculture
  • Door check on work attendance system, POS system, rice selling system
  • Building automation system, power monitoring, self-service banking system, telecom machine room monitoring
  • Industrial Machine to Machine (M2M) communication.


System Information 
Basic Frequency120MHz
Flash512K byte
Port Number1
Interface Standard8 pin RJ45
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 Number4 (Each port can work as RS-232,RS-485 and RS-422, can work at the same time)
Interface StandardRS-232: DB9 pin type, RS-485: 2 wire (A+,B-), RS-422 (A,B,Y,Z)
Data Bits5,6,7,8
Stop Bit1,2
Check BitNone,Even,Odd,Space,Mark
Baud Rate600bps ~ 230.4Kbps
BufferSend and receive 2k bytes respectively
ProtectionRS-485: anti-static 2KV,lightning protection
RS-485 Pull-up and Pull-Down Resistor2.2 KΩ
Virtual Serial(USR-VCOM)Windows 2000 or higher(32 bit/64 bit)
ConfigurationBuilt-in webpage, computer set-up software, serial command
Basic Parameter 
Size222 x 122 x 29 mm (including shell and terminals)
Operating Temp.-40 ~ 85°C (industry)
Storage Temp.-40 ~ 85°C, 5 ~ 95% RH (no condensation)
Input VoltageDC 5 ~ 36V
Working Current53mA @ 12V

Additional Information, Software & Documentation

For additional Information, Software & Documentation, see the product page on USR's website.

  • Datasheet:
  • User Manual:
  • Quick Start Guide:

For additional Information, Software & Documentation, see the product page on USR's website:

Package Includes

1 x Genuine USR-N540  - 4 Port Serial RS232/RS485/RS422 to Ethernet Interface Converter
1 x Australian Wall Mount Power Supply
4 x DSUB to 5 pin terminal block adapters

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Weight1310 g

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