Drivers for Pulox / Contec CMS50D+, CMS50E, CMS50F and CMS50I

Below are the drivers for the Drivers for Contec CMS50D+, CMS50E, CMS50F and CMS50I (Pulox PO-200, PO-300, PO-400).

These drivers are for the USB cable that runs from your Pulse Oximeter to your computer. This cable is a special serial to USB cable (CP210x USB to UART Bridge VCP). You will only be able to use your SPO2 monitor with the special cable that came with it! (pictured below)

SPO2 Monitor USB Serial Cable
SPO2 Monitor USB Serial Cable, note the larger than average USB end on the top right containing usb-serial circutry


Linux 2.6.xlinux_2-6-x_vcp_driver_source

Linux 3.x.xlinux_3-x-x_vcp_driver_source

Windows CE 6.0: vcp_wince60

Windows CE 5.0vcp_wince50

Macintosh OSX (v4): mac_osx_vcp_driver (confirmed to work with macOS Sierra)

Windows 2K Server Download VCP (4.79 MB): cp210x_vcp_win2k-exe

Windows XP/Server 2003/Vista/7/8/8.1 Download VCP (3.66 MB): cp210x_vcp_windows

Windows 7/8/8.1/10 Download VCP with Serial Enumeration: cp210x_windows_drivers_with_serial_enumeration

Windows 7/8/8.1/10 Download VCP (5.3 MB):  cp210x_windows_drivers

Unsure what operating system you have? Check out

The drivers listed above are sourced from Silicon Labs. They are kept here as a mirror of the silicon labs driver page. I will do my very best so that any links to this site will not be broken. Questions or Answers? Please comment below.

If you’re on Windows, you can use SPO2 Review [download] or SPO2 Assistant [download] to review the data. For OSX Users, please see my post on SPO2 Alternatives for OSX.

9 thoughts on “Drivers for Pulox / Contec CMS50D+, CMS50E, CMS50F and CMS50I”

  1. I have Mac OS Sierra 10.12.6
    I’ve downloaded and installed your Mac driver. I plug in the oximeter and it doesn’t show up in finder. I try using SleepyHead to download data. SleepyHead can’t find the driver either. Do you have a step by step set of instructions I can follow so I can make sure I’m not missing something?

    1. Did you receive any respond?

      I am not able to download the driver –
      It says: FORBIDDEN to access the serve.

      SPO2 Alternatives for OSX: Error page,


  3. Where can I buy this special cable? — mine went missing. And you are absolutely positive no other USB cable will work with it? First time I have ever seen this. And… the company does not indicate this in their product specifications. It’s not that I don’t believe you (I do), it’s just very odd and something I have never seen before.

  4. I have installed all three programs you mention, SpO2 assistant 3.0.4, SpO2 review 1.2, and SpO2 Manager 1.2.
    The CMS50D+ output shows up on the SpO2 manager software, but I can’t get SpO2 assistant to recognize the device, nor get any input to SpO2 review.
    Can you tell me how to proceed, or point me to directions? Initially I thought it was a driver issue, but now that I am getting clear results on SpO2 manager, I know that is not the problem.

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