USR-N540 Four Ports RS232 RS485 RS422 to Ethernet Converter

Communication Expert of Industrial IOT
USR-N540 Four Ports RS232 RS485 RS422 to Ethernet Converter
USR-N540 Four Ports RS232 RS485 RS422 to Ethernet Converter
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Price: $109.60
Availability: In Stock
Model: USR-N540
Manufacturer: USR IOT
Average Rating: Not Rated

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User Manual:

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Introduction of Four ports Serial Device Server

USR-N540 is a four ports serial device server to connecting RS232 RS485 RS422 interface devices to a 10/100M Ethernet network running TCP/IP protocol. USR-N540 is based on ARM procesor, internally integrated with TCP/IP protocol. USR-N510 serial to Ethernet converters / Adapters is easy to use. User can configure parameter by a standard web browser or USR setup software to realize remote data acquisition, remote control and management. This high performance networking serial to TCPIP server enables engineers spend little time to add networking function to products.


USR-N540 is a compact RS232 / RS485 / RS422 to Ethernet server for remote access serial electronic devices. By connecting USR-N540 to serial based equipment, user can easily offer Ethernet networking capability as a standard feature. So equipment can be accessed and controlled over the Internet network. USR-N540 is a one port serial server, which supports four RS-232 or RS-485 or RS-422 working at the same time.


This serial to Ethernet converter have 16 KByte receive/sending buffer of network and 2 KByte receive/sending buffer of serial, which makes the communication more stable and safe. It is CE(EMC+LVD), FCC, RoHS, and WEEE compliant.

Features of Serial to Ethernet Converter

  • Modbus Gateway: Modbus RTU to Modbus TCP  (bidirectional communication)
  • Cortex-M4 kernel, industrial working temperature range(-40~85℃), elaborate optimization TCPIP protocol stack, stable and reliable
  • selectable RS232/RS485/RS422 port, Different port can be used together, work independently, distinguish the connected serial port via port number
  • Auto-MIDX function, discretionarily connect cross-over or direct network cable, automatic switching
  • Support TCP Server, TCP Client, UDP, UDP Server, HTTPD Client,websocket, various of ethernet protocols
  • Support virtual serial port, provide corresponding software
  • Serial port highest baud rate from 600bps ~ 230.4Kbps
  • wide voltage input, more applications
  • Support DHCP, automatically access IP, can inquire the facility within network through the setup software
  • The global unique MAC address bought from IEEE
  • Support upgrade firmware via network
  • Support remote IP and domain name at the same time
  • Support up to 8 link from client when act as TCP Server, same data will be send to all client
  • Can modify http server port from default port 80 for module built-in http server
  • Support Keepalive, detect a dead link quickly and make sure the connection is stable

Parameters of USR-N540 RS232 / RS485 / RS422 to Ethernet Server

Parameter Value
Input Voltage DC 5 ~ 24V
Working Current 53mA(43.7~45.1)@ 12V
Power <1W
Certificate CE, FCC, ROHS
Size 222 x 122 x 29 mm
Operating Temp. -40 ~ 85°C (industry)
Storage Temp. -45 ~ 105°C, 5 ~ 95% RH (no condensation)
Interface Each port supports RS-232,RS-485 and RS-422;
can work at the same time)
Network Protocol IP, TCP, UDP, DHCP, DNS, HTTP, ARP,
ICMP, Web socket, Httpd client
Packing list USR-N540 *1, 5V1A power, serial line, cable

Protection of USR-N540 Industrial Serial to Ethernet Converter

Power Protection Reverse Protection
ESD: 15KV, air discharge
Surge: 4KV (8/20us)
Pulse train; 1.5KV, 100KHZ
Serial Interface Protection ESD: 2KV

Set-up Images

4 ports serial device server

4 ports serial device server

Application of Compact Serial Ethernet Server

This Serial to Ethernet converter is suitable for electronic devices with RS232 / RS485 / RS422 interface like: PLC, Scales, scanners, printers, Sensors and other industrail and commercial devices, to add network connectivity to those devices conveniently and uilding intelligent devices with remote control capability. You can also use USR RS232 RS485 RS422 to Ethernet converter into any electronic product for applications as below:

  • Industrial automation control for data transmission
  • Remote diagnostics, record and troubleshooting
  • Security monitoring, CCTV, entrance guard system, Building automation system
  • Power management
  • Environmental monitoring, temperature and humidity monitoring
  • Logistic transportation supervision and location

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