Null-modem emulator Icon

The virtual serial port driver for Windows.

User Ratings

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ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 3 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
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User Reviews

  • dwildbore
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Just like Martin I can't use it because the driver isn't signed. Great shame I've heard nothing but good about it.

    Posted 04/04/2014
  • dwildbore
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Just like Martin I can't use it because the driver isn't signed. Great shame I've heard nothing but good about it.

    Posted 04/04/2014
  • lelekx
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Lack of a digital signature is a serious drawback, keeping me (and probably others) from use this software in a production system. As ReactOS team offers free driver signing service, there is no reason why the driver is not signed yet. Terms and conditions are listed on their "Driver Signing" wiki page.

    Posted 02/22/2013
  • fhorvath
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    com2tcp does not do true binary communications with the telnet filter. The recommended 0x0D padding feature only solves the problem in one direction.

    Posted 02/21/2013
  • sqdancefan
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    64-bit Windows requires all drivers to have a valid digital signature. Com0com does not, so the driver is unavailable for use by 64-bit Windows 7. The ReadMe file says, The com0com.sys is a test-signed kernel-mode driver that will not load by default. To enable test signing, enter command: bcdedit.exe -set TESTSIGNING ON and reboot the computer. NOTE: Enabling test signing will impair computer security. This must be done by an administrator, as installation must be.

    Posted 11/11/2012
  • jfhaugh
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    This could be more difficult to use, but that would be difficult to do. "com2tcp" was not in the Windows download and after spending more time than it would have cost to purchase a commercial product, I finally located the file. Then I had to use two different windows and two different virtual pairs of devices to create two virtual serial ports. Finally, my application, which is based on RXTXcomm, doesn't recognize "CNCA0" as a device, so I had to use "\\.\CNCA0". I'm sure there is an easier way (I hope) to do all this, but I'm not going to stick around to figure it out. Sorry for the harsh review -- com0com is not ready for prime time.

    Posted 09/24/2010