4 Ports RS232/RS485/RS422 Serial to Ethernet Converters | Serial Device Servers

Serial to Ethernet Converter, 4 ports

Model: USR-N540

USR-N540 is an Industrial Serial to Ethernet Converter to realize bi-directional transparent transmission between RS232/RS485/RS422 and network with function of modbus gateway.
  • 4 serial ports, each one can select RS232/ RS485/RS422
  • Hardware Watchdog, keep to work stable
  • Modbus RTU -TCP, Customized webpage, websocket
  • Serial ports can work simultaneously
  • 4 Ports RS232/RS485/RS422 Serial to Ethernet Converters | Serial Device Servers

    General Details

    Introduction of 4 ports Serial Ethernet Converter

    USR-N540, 4 serial port Ethernet converter which can realize transparent transmission between TCP/UDP data package and RS232/RS485/RS422 interface.


    Character of USR-N540 Serial Ethernet Converter

    Industrial Solution TI Cortex M4 Solution, -40~85C
    Web Server Web socket/ Web to Serial
    Modbus Gateway Modbus RTU to Modbus TCP / Modbus Pollinig
    Flow Control CTS/RTS, XON/XOFF
    Watchdog circuit, never cash
    ESD 8KV
    Network Printing

    2 network links, each serial support sending data to two servers


    Feature of 4 ports Serial Ethernet Converter

    TI Cortex-M4 kernel,industrial working temperature range and TCPIP protocol stack.

    Auto-MDI/MDIX,RJ45 port with 10/100Mbps

    TCP Server,TCP Client,UDP Client,UDP Server and HTTPD Client work mode

    4 ports can work independently at the same time

    Can distinguish which serial port connects to the device via port number

    Support virtual serial port and provide corresponding software USR-VCOM

    Serial baud rate from 600bps to 230.4K bps

    DNS and DHCP supported

    Provide PC TCP/IP socket programming example such as VB,C++,Delphi,Android and IOS

    Built-in webpage;also can customize webpage for users

    The global unique MAC address bought from IEEE (begin with D8-B0-4C);user can define MAC address

    Support upgrade firmware via network

    Support keepalive,rapidly detect dead links

    Support account and password,can be used to page login and network settings

    Support one channel Websocket,realize bidirectional transparent transmission between webpage and serial 0

    Support Modbus RTU to Modbus TCP

    Support UDP broadcast function

    Each serial can work as rs232,rs485 or rs422; Default port is RS232 BD9 male port

    Four channel serial communication indicator: TX/RX, CTS/RTS, XON/XOFF

    Support DC adapter and 5.08-2 terminal power supply

    Reload button,one key to restore default settings

    RJ45 with Link/Data indicator light,built-in isolation transformer and 2 KV electromagnetic isolation


    Serial Port of  Serial Ethernet Converter (Default Port: RS232 DB9 male port)

    Serial Port of  Serial Ethernet Converter (Default Port: RS232 DB9 male port)

    Serial Port of  Serial device server (Default Port: RS232 DB9 male port)


    Application Field of 4 ports Serial Device Server

    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



    System Information
    Processor Cortex-M4
    Basic Frequency 120MHz
    Flash 512K byte
    Port Number 1
    Interface Standard 8 pin RJ45
    Rate 10/100 Mbps, MDI/MDIX, auto switch between cross and direct connection
    Protection 2KV electromagnetism isolation, shell insulation blocking
    Network Protocol IP,TCP,UDP,DHCP,DNS,HTTP,ARP,ICMP,Web socket,Httpd client
    Receive Buffer Max 16k bytes buffer
    Port Number 4 (Each port can work as RS-232,RS-485 and RS-422, can work at the same time)
    Interface Standard RS-232: DB9 pin type, RS-485: 2 wire (A+,B-), RS-422 (A,B,Y,Z)
    Data Bits 5,6,7,8
    Stop Bit 1,2
    Check Bit None,Even,Odd,Space,Mark
    Baud Rate 600bps ~ 230.4Kbps
    Flow Control RTS/CTS XON XOFF
    Buffer Send and receive 2k bytes respectively
    Protection RS-485: anti-static 2KV,lightning protection
    RS-485 Pull-up and Pull-Down Resistor 2.2 KΩ
    Virtual Serial(USR-VCOM) Windows 2000 or higher(32 bit/64 bit)
    Configuration Built-in webpage, computer set-up software, serial command
    Basic Parameter
    Size 222 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 Voltage DC 5 ~ 36V
    Working Current 53mA @ 12V
    Power <1W
    Certificate CE,FCC,ROHS
    Warranty 2 years


    User Manual

    [User Manual] USR-N540 Quick Start Guide | download
    [Datasheet] USR-N540 Datasheet | download
    [User Manual] USR-N540 User Manual | download
    [AT Command] USR-N540 AT Command Set | download
    [User Manual] Virtual-COM-Software-USR-VCOM-creates-TCP-Client-port | download
    [User Manual] Virtual-COM-Software-USR-VCOM-creates-TCP-Server-port | download
    [User Manual] Websocket-function-of-Industrial-M4-serial-to-Etherent-products_V1.0.0 | download
    [User Manual] Modbus-Gateway-Manual-of-Industrial-M4-Serial-to-Ethernet_V1.0.0 | download
    [User Manual] TCP-Server-mode-and-TCP-Client-mode-manual_V1.0.0 | download
    [User Manual] Transparent-transmission-between-USRIOT-Serial to Ethernet-products | download
    [User Manual] UDP-Server-mode-and-UDP-Client-mode-manual_V1.0.0 | download
    [User Manual] USR-N5xx-realize-Modbus-RTU-Master&Modbus-TCP-Slave-communication_V1.0.0 | download
    [User Manual] Upgrading-firmware-method-of-Serial-to-Ethernet-products_V1.0.2 | download

    Development File

    [Customized Webpage] USR-N540 Customized Webpage | download
    [Demo Code] TCPIP Demo Code | download
    [Config Protocol] E45&M4 Series Config Protocol V1.4 | download

    Application Software

    [USR-VCOM] Virtual Serial Software V3.7.1.520 | download
    [USR-TCP-Test] Testing Software | download
    [USR-TCP-Test_android] Testing Software | download
    [USR-M4] USR-TCP232-M4K3 Setup Software V2.3.3.97 | download

    Product Certificates

    [Certificate] M4 Series CE FCC ROHS WEEE Certificate | download
    [CE Certificates] ce-certificates-serial-to-ethernet-module-2017 | download

    Company File

    [Product Catalog] USR Product Catalog | download

    How to Buy

    Official Online ShopClick to order USR-N540
    Alibaba Online ShopClick to order USR-N540
    Contacts SalesYou can leave a message for our sales below.


    Model Interface
    Low cost M0 Serial to Ethernet converter

    DHCP, DNS, HTTPD Client, Webpage

    USR-TCP232-302 RS232
    USR-TCP232-304 RS485
    USR-TCP232-306 RS232/RS485/RS422
    Multi COMs Industrial M4 Serial to Ethernet Converter
    USR-TCP232-410s RS232&RS485 *1
    USR-N510 RS232/RS485/RS422 *1
    USR-N520 RS232/RS485/RS422 *2
    USR-N540 RS232/RS485/RS422 *4



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