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 Home -> Products -> SerialNull -> Overview
Virtual Serial Ports are absolutely the same copies of real ones
Real serial ports are not occupied
Full support of HandFlow control(Hardware/(Xon/Xoff))
Virtual link is much more reliable than common physical link
"Hot" installation - no reboot required
User friendly GUI and on-the-fly help.

SUDT SerialNull is an advanced configuration utility, which purpose is to emulate RS232 serial ports connected via virtual null-modem cable using Virtual Serial Ports Driver, with SerialNull you can create any number of pure virtual serial ports in your system connected into pairs via virtual null-modem cable without having real serial ports occupied. Virtual Serial Ports appear to operating system or any Windows application as "standard" hardware serial ports. Virtual serial ports created by SerialNull work exactly the same as real ports in your system managing all signal lines and emulating baud rate.

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  Usage Scenario

Why do I need SerialNull ?

There is an endless variety or reasons why you may need additional virtual serial ports created in your system. Serial port data capture, telecommunication and data transmission system, system debugging etc among them. On the other hand you might need to establish serial port connection to computer or device that has serial port that cannot be connected with null-modem cable directly due to remote location. In this case you may create application that uses Virtual Serial Port Driver to communicate with remote serial port by TCP/IP stack.

You may use Virtual Serial Ports for:
  • Testing/debugging different applications that use null-modem cable such as:
    • any existing terminal application

    • your own application that uses serial port.
      For instance: you write your own program that connects to modem and sends AT commands. In this case you may emulate connection by creating virtual serial port and send/receive commands to it. Debugging on the real device is quite cumbersome, slow and which is more important - it doesn't support multiple-threading.

    • you may want to create your own data sniffer application that works with serial port. In order to test or debug it you may create virtual serial port pair.

  • Testing/debugging different serial port device emulators such as modems, fax, GPS etc
  • Testing/debugging firmware or device drivers. You may even don't have this hardware in order to develop the driver for it.

  • Testing/debugging two applications that have different address space and have no direct way to contact each other.

  • Testing/debugging application for interception caching/proxying (as well as translation, logging) data sent over network

Usually you need second computer or expansion card to be able to perform such tests, however using SerialNull you may do it on single computer using virtual port pair.

Features list:

  • Virtual Serial Ports are absolutely the same copies of real ones
  • Real serial ports are not occupied
  • Full support of HandFlow control (Hardware/(Xon/Xoff)) etc
  • High-speed transfer, Link between virtual serial ports is much faster than real null-modem cable connection
  • You can create as many virtual serial ports pairs as you want
  • Virtual link is much more reliable than common physical link
  • Uses Windows kernel driver technology (supporting WDM, WMI, Power Management, PnP, etc.)
  • "Hot" installation - no reboot required after installation, creation or reconfiguration of virtual serial ports
  • User friendly GUI and on-the-fly help. It is very easy to configure virtual serial ports pair
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