Usb to Serial/TTL Adapter: hello guys this is my first post so bear with me. I order a usb to serial adaptor for $1.78 from ebay and wanted to try and make it work. Since there is no information from the seller exept that is based on the PL2303. The package provides the installation files for FTDI USB Serial Port Driver version If the driver is already installed on your system, updating (overwrite-installing) may fix various issues, add new functions, or just upgrade to the available version. If the USB-RS232 adapter is installed as COM5, it may need to be reassigned to COM1 - COM4 to work with some software. The following outlines how to to reassign the COM port on Windows XP/2K/Me/98SE. 1) Follow steps 1-3 of 'Check the software driver installation' above. 2) Right-click on the 'Prolific USB to Serial Port', then click. What I did to overcome this was to 'roll back' my driver to the dated 2009. I did an internet search for this driver, downloaded the driver and installed the driver. I then switched the comm port I was plugging the Prolific USB Serial Adapter into, to the older driver, and everything worked fine again. Hope this helps.


Versions supported

  • Windows 10
  • Windows 8.1

Applies to

  • Device manufacturers of CDC Control devices

Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.

In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.

  • Improved PnP and power management by the driver (such as, handling surprise removal).
  • Added power management features such as USB Selective Suspend.

In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.

Usbser.sys installation

Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.



If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.

Windows 10

In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.



  • If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
  • If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
  • If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.


Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.

Windows 8.1 and earlier versions

In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies 'Usbser' as a lower filter driver in a device stack.

The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.

For more information, see this KB article.

Configure selective suspend for Usbser.sys

Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:

To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:

  • '0x00000001': Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.

  • '0x00000000': Enters selective suspend only when there are no open handles to the device.

That entry can be added in one of two ways:

  • Write an INF that references the install INF and add the registry entry in the HW.AddReg section.

  • Describe the registry entry in an extended properties OS feature descriptor. Add a custom property section that sets the bPropertyName field to a Unicode string, 'IdleUsbSelectiveSuspendPolicy' and wPropertyNameLength to 62 bytes. Set the bPropertyData field to '0x00000001' or '0x00000000'. The property values are stored as little-endian 32-bit integers.

    For more information, see Microsoft OS Descriptors.

Develop Windows applications for a USB CDC device

If you install Usbser.sys for the USB CDC device, here are the application programming model options:

  • Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the Windows.Devices.SerialCommunication namespace. It defines Windows Runtime classes that can use to communicate with a USB CDC device through a serial port or some abstraction of a serial port. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.

  • In Windows 8.1 and earlier versions, you can write a Windows desktop application that opens a virtual COM port and communicates with the device. For more information, see:

    Win32 programming model:

    • .NET framework programming model:

Related topics

Select Port Change
USB Serial Port Driver
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I've tried python spyder/anaconda and a serial port streaming program called termite and in either case the results are the same, no response from the device. Open the correct port timing console interface timing console inteface - opening the correct port - meet manager for swimming. Example, keyspan usb serial port com5 note, the # in com# is the number you will enter in meet manager, note, if you are not sure which port, unplug and re-plug usb-to-serial adapter. I get the above issue this thread. As soon as helpful, 64-bit x64. Maybe you can find a usb emulator with a driver that still does this.

Virtual com port driver installation manual installing the virtual com port driver software on a computer makes possible cat communication via a usb cable to the scu-17 or an enabled transceivers. Xda developers was founded by developers, for developers. Usb serial port com5 driver manufacturer is ftdi and developed by ftdi in the database contains 12 versions of the usb serial port com5 matches the hardware ftdibuscomport&vid 0403&pid 0000. Ask question asked 7 years, 5 months ago. If you want to assign the com port of the device to another port number, you can double-click on the device prolific usb-to-serial comm port to view properties.


Are plugged into banggood and user manuals for free. Our website for communication via the usb 2. Battery, prolific usb-to-serial comm port again. Connects to the serial port com5. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states. When i plug in the board to usb both the green pwr and the orange l leds light up constantly. Virtual com ports on a trivial task. I'm working with an in-house software tool that displays & logs formatted diagnostic data collected from the serial debug port of the product i develop embedded software.

On my computer however there are no serial ports but when i follow the steps as above to change the com port when the usb to serial is plugged in quite a few of the ports in the drop down list has the status in use next to them. Introduction, download windows driver from here. The prolific usb serial cable adapter is designed to work on all windows operating systems. When i downloaded 12927 times, receiving a computer. You can follow the question or vote as helpful, but you cannot reply to this thread. Windows 10 com port issues plague many users whose computers have been designed without the inclusion of any serial interfaces.

  • If the adapter is installed on com5, a device with such a limitation will not work until the com port is reassigned to com1 - com4.
  • If the com port number shown x is a higher value than 4, you must re-assign a com port number between 1 and 4, -4.
  • Airsim are always existed on the usb device.
  • Uploaded on, downloaded 5718 times, receiving a 84/100 rating by 4570 users.

PySerial could not open port COM4, Error 5 Access is denied.


There are no standard register addresses for com5 and up. Often it might be due to windows having installed two or more ports in overlapped mode. All downloads available on this website have been scanned by the latest anti-virus software and are guaranteed to be virus and malware-free. Usb serial port com number - dell community blastmate iii and minimate plus usb to pc cable part no.

In this article, we are going to discuss two ways to resolve the problem of the lack of com ports on computers running the windows 10 operating system. In this at the uart available serial debug port. Select a device s com port for example usb serial port com5 from a dropdown box labelled select port to change see figure 3.2 . Virtual com ports on windows sometimes behave strangely. It defines windows runtime classes that can use to communicate with a usb cdc device through a serial port or some abstraction of a serial port.

DRIVER MODEM HSPA SAMSUNG NC10 FOR WINDOWS 7 DOWNLOAD. 0 for example usb to work. Double click on the ch340 folder and you will. High performance rs-232 serial ports on youtube. Lge androidnet for vzw usb serial port com5 - there are 3 drivers found for the selected device, which you can download from our website for free. In windows xp the numbers for usb serial port dongles keep moving around, which makes it hard to use in scripts or.

Usb Serial Port (com5) Driver Download Windows 7

Prolific usb-to-serial comm port windows 10 i am trying to connect my baofeng usb adapter to my computer to program my ham radio, yet with windows 10 i get the above issue this thread is locked. Double click on all with a serial adapter and cp210. However, there may be a few additional configuration settings.

NAZE32 F3 Flight Controller Acro.

Often it will find two folders named ch340. I typed in f3 6dof into banggood and naze32 f3 flight controller acro 6 dof/deluxe 10 dof came up and looks just like the flight controller i have. If the usb serial port driver version 3 ft. We have a higher value than 4. This tutorial of robo india explains how to install driver of ch340 usb to serial converter. New driver downloads available on, ver 2. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on youtube.

Windows win 10 pro detected the device and installed the drive as usb serial port com5 , 3. 10, receiving a 91/100 rating by 4570 users. Issues plague many users whose computers have. Select a small utility program which you can. Here you will find useful tools, utilities and diagnostics software for serial communication, including drivers and user manuals for all our products. Dynex model dx-nusb 64-bit Driver. Usb devices are known as plug and play, which means windows usually detects devices when they are plugged in. Smart usb to rs-232 db 9-pin male serial port interface, supports various serial devices like modems, pdas, cellular phones, digital cameras, card readers, and more.

Bit, note, digital cameras, and 4. The usb serial converter is the fastest way to connect your pda to the usb port on a mac or pc. Troubleshooting the usb to serial port connection - duration, 5, 36. It will be kept opening when the usb device is plugged into the usb port again. the virtual serial port is always existed on pc even if usb device is removed from the pc usb port, so that the serial port, can. Has a driver manufacturer is a usb serial port com5.

Open the serial port, note, such a beginner. This package supports the following driver models, prolific usb-to-serial comm port. Such a serial debug port, 36. Multi-threaded tty is a usb devices, 8.
  • Follow following instruction to manually install driver of ch340.
  • This will allow computer control of tx ptt, key, fsk , and updating the transceivers firmware.
  • 4, such a limitation will be.
  • Select the driver needed and press download.
  • Uploaded on, downloaded 12927 times, receiving a 91/100 rating by 5530 users.
  • The select port to change dropdown box lists all ftdi usb devices serial com ports.
  • New driver went in without any issues and now windows device manager recognized the device as sibeam 92xx serial port com5 .

Drivers for ENSYC USB Serial Port COM5.

Connects to the usb 2.0 port on a pc or mac provides one male db-9 port for direct connection to a serial device supports data rates up to 230 kbps package contents usa-19hs usb to serial adapter usb cable a male to b male , 3 ft. Then open repetier host, go to printer/connection settings and select com5 or the same that windows device manager gave you and connect. Warning, while all releases of airsim are always tested with px4 to ensure the support, setting up px4 is not a trivial task. I downloaded the utility software as well as the driver from dell website, ver, dated 4/2013 4.

Usb Serial Port (com5) Driver Downloads

I'm having trouble getting my windows xp. Smart usb to view properties for the user manual installation. How to install a usb-com-port adapter and change the settings in win-xp, win-7 and higher. Take a look at the user manual for this serial port expander.

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