Serial Port Servers

Equipment with a serial port is usually connected directly to the computer when the distance is less than 15 meters.

With a serial port server (Serial Device Server), the equipment can be connected anywhere on a network so that all network users can use them. This applies to both local and internet. When connected over the Internet, the reach becomes global.

Serial Device Servers

It has the task of making a...

Equipment with a serial port is usually connected directly to the computer when the distance is less than 15 meters.

With a serial port server (Serial Device Server), the equipment can be connected anywhere on a network so that all network users can use them. This applies to both local and internet. When connected over the Internet, the reach becomes global.

Serial Device Servers

It has the task of making a serial port available on a network. It is a compact computer that has an Ethernet network interface and one or more serial ports. Its firmware is only for sending data from the network to the proper serial port and transmitting data received on serial ports to the network. The protocol is TCP / IP (Internet Protocol), so even a serial port server with many ports has only one IP address and each serial port has its own port number.

Three communication methods

In principle, it can be communicated with serial port servers in 3 different ways:

  • The "Winsock" method
  • "Virtual com driver" method
  • "Box to box" method

Used if there is no computer with network function available. The two serial port servers are configured to send data to the counterpart. They are defined as "Master" and "Slave", each with its own IP address and the counterparty's IP address. In principle, it is a fixed connection between the serial ports and it is important that the connection be independent of operating systems and software versions otherwise used on the network.

The "Box to box" method is also the only usable solution in cases where the system cannot include software that uses "sockets" or COM port drivers, for example. a PLC and a simple measuring port with serial port.

In all common programming languages ​​for Windows (Visual C ++, Visual basic, Delphi and others), TCP / IP is accessed via "Winsock", releasing the programmer to kno

The "Winsock" method

This method assumes that the applications using the serial port server have access to the network via the TCP / IP protocol using the networking features built into Windows. It is the standardized interface for these features called "Winsock".

In all common programming languages ​​for Windows (Visual C ++, Visual basic, Delphi and others), TCP / IP is accessed via "Winsock", releasing the programmer to know all the details of the underlying network protocols.

Once the protocol, IP address, port number and client / server status are selected, free-form data blocks can be exchanged between the program and the serial port server.

Many types and variants

There are a variety of variants among serial port servers. The number of serial ports per. unit varies from 1 to 16, and the serial ports can be traditional RS232 ports with "point to point" connection up to approx. 15 m or RS422 ports with balanced "point to point" signals up to approx. 1200 m and RS485 ports, for "multidrop" connection, where up to 32 serial ports can share the same 2- or 4-wire bus. Here, the range will also be up to 1200 m.

Most serial port servers use the wired Ethernet network interface, others use wireless networks (Wifi) or fiber optic cable, where the network connection is via fiber optic cable.

Serial Port Servers

There are 49 products.

Showing 1-20 of 49 item(s)
  • Serielportserver 4 x RS232...

    Serielportserver 4 x RS232 / 485 single port 10/100 Mbit, SFP multi og singlemode

    Omsætter mellem fiber og 4 x RS232/485
    Single port
    1 x 10/100 Mbit Ethernet
    4 x RS232/485 
    Skrueterminalblok (5 polet)
    CPU 16 bit CPU, 100 MHz
    Hukommelse 512 KB RAM, 512 KB flash og 512 bytes EEPROM
    RTS/CTS, Xon/Xoff
    OS support WIN9x/NT/2000/XP
    SFP konnektor til LC fiber
    62 x 50 x 120 m.m. (H x B x D)
    Display 3 lysdioder viser Tx/Rx, Netværks- og systemstatus
    Forsyning 9 - 32 VDC (Medfølger ikke)

    Price DKK2,323.00
    Product code: FIBER4SER485
    Physically in stock  
  • MOXA NP5150, NPort...

    MOXA NP5150, NPort serielportsserver, 1 x RS-232/ 422/ 485, DB9 han

    1-port RS-232/422/485 serial device servers, MOXA NPort 5150.

    • Small size for easy installation                                                                  
    • Real COM/TTY drivers for Windows and Linux
    • Standard TCP/IP interface and versatile operation modes
    • Easy-to-use Windows utility for configuring multiple device servers
    • Built-in 15 KV ESD protection for all serial signals
    • SNMP MIB-II for network management
    • Configure by Telnet or web browser
    • Adjustable termination resistor for RS-485 ports
    Price DKK1,067.00
    Product code: ETH1SER5150
    On the way in  
  • 1 x RS422 eller RS485...

    1 x RS422 eller RS485 Serieportserver

    Serial Device Server med RS485/RS422 via Ethernet og Internet
    Atop SE5001-S5, 
    RS422/485 via DB9 han-stik
    Strømforsynes fra 9 - 30VDC eller 5VDC (power jack) - 1,5Watt

    Price DKK786.00
    Product code: ETH1SER485MINI
    Physically in stock  
  • Serielportserver 1 x...

    Serielportserver 1 x RS232/422/485, MOXA DE-211

    1 port RS-232/422/485 serial device server, MOXA NPort Express DE-211.

    • 3-in-1 serial port: RS-232, RS-422, or RS-485
    • Versatile operation modes, including TCP Server, TCP Client, UDP, Ethernet Modem, and Pair Connection
    • Real COM/TTY drivers for Windows and Linux
    • 2-wire RS-485 with patented Automatic Data Direction Control (ADDC®)
    • Built-in 15 kV ESD protection for all serial signals
    Price DKK798.00
    Product code: ETH1SER+
    Physically in stock  
  • 1 x RS232 Serieportserver

    1 x RS232 Serieportserver

    External COM port on Ethernet and Internet
    Atop SE5001-S2 Serial Device Server
    10 / 100Mbit Ethernet.
    Serial port via DB9 male
    Power supplied from 9 - 30VDC or 5VDC (power jack ) - 2.8 Watts
    Power supply not included

    Price DKK913.00
    Product code: ETH1SER-MINI+
    Physically in stock  
  • 1-PORT RS422/485 serielportserver

    1 port serial port server RS422 / 485, MOXA NPort 5110A. Serial Device Server

    1-port RS422/485 serial device server, MOXA NPort 5110A

    Only 1 W power consumption
    Speedy 3-step web-based configuration
    Surge protection for serial, Ethernet, and power lines
    COM port grouping and UDP multicast applications
    Screw connectors for secure installation
    Real COM/TTY drivers for Windows and Linux
    Standard TCP/IP interface and versatile TCP and UDP operation modes
    Connect up to 8 TCP hosts

    Price DKK992.00
    Product code: ETH1SER5130A
    On the way in