Windows xp serial ports not working

Learn more. Read serial port work good in windows XP but stop working and slow in windows 7 Ask Question. Asked 6 years, 5 months ago. Active 6 years, 5 months ago. Viewed times. Text; serialPort1. ToInt32 textBox2. Text ; serialPort1. Open ; serialPort1. Write "? Second - then. ToString ; label3. ToString ; label4. AddCurve "", list1, Color. Refresh ; serialPort1. Improve this question. Amir Poursadegh Amir Poursadegh 1 1 silver badge 8 8 bronze badges.

Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. In Device manager there is no yellow sign — all seems O. Check Device properties for COM 1 — no conflicts , device is working properly. I've noticed problem when connecting card reader - card is not recognized. Technically speaking, Windows does not automatically detect hardware plugged into serial ports, like COMs.

You would need to setup the drivers from the add hardware wizard for the device so windows can see and use it. Do you have drivers for the card reader?

What make and model of card reader is it? If you connect say a serial mouse to that port can it be used? May also have settings for flow control. Also check that com1 is associated with serial port one. Check here for making a loopback plug, and performing the loopback test. Thanks for answers. I guess Card reader is faulty, but to be sure I need to test it on another computer what I'll do soon.

All settings of COM1 are O. That covers the transmit and receive. Using hyperterm you might be able to get a response back from the card reader if you type in any of the control codes it uses. The suggestion to use a serial mouse is good, if you have one. Ed Fair Give the wrong symptoms, get the wrong solutions.

Thanks very much for assistance. Checked programmer on another comp and this one is faulty. I'll try what you suggest , thanks a lot. If not, we'll dive deeper to see what windows is reporting. Device manager showed them both as registered to COM1. I then unpluged-replugged, and got:. It always assigned the mbed to COM I then tried to run a program that writes out to the port. I tried my LPC mbed. It works fine. LPC works fine LPC does not. Quite curious. Next thing to try is maybe another USB port.

I realize COM port number will change. I'll let you know. Sounds like the LPC on XP is still coming in on some low numbered port, and I'm worried there may be a clash still if windows is confused. COM25 or some other higher one. Then unplug-replug and check it comes in OK i. Then re start teraterm and see if you get life! If not, this is very strange. Can you list the exact hardware, OS specs? Maybe you can find another XP machine to try just to really narrow it down to that machine?

For sanity, it might also be worth ensuring the program on the mbed really is running - e. This would confirm e. But as you have had the board working with Vista, it is unlikely to be this. And checking teraterm is restarted. Actually, I did have other code running to flash some LEDs. It would not be the first time I had the wrong compiler selected The good news is I have it working. I finally chose COM9, and it works fine now.

I am not sure why. At this point, I am not sure where the problem lies, but I am suspecting it might have to do with the PC I am running on. I would not worry about it being any other issue. Most often, virtual COM ports in Windows 10 install automatically when a user connects a converter to a computer with internet access. This is not a major issue, as users can simply install the drivers utilizing the disk that comes with their specific Serial Converter.

Follow the instructions below to install Serial Converter device drivers from a disk:. Some software applications are designed to only operate with designated serial ports. If you need to work with this kind of program, you may need to know how to find port numbers in Windows 10 so you can modify them if necessary. In many cases when working with older devices or applications, you will be called upon to change COM port numbers to successfully operate the programs and peripherals. Some legacy equipment is only capable of working with specifically named serial ports.

The following procedure allows Windows users to change the COM port number for any attached device. Windows may have assigned a different identifier to the port which you will be required to modify. There are many instances where this Windows 10 COM Port Driver software can be instrumental when working with serial devices and applications. Some of the uses of the software include testing and debugging in usage scenarios that include:.

The easiest way is to use the default Windows search bar located next to the Start Menu on the toolbar. There are two ways to access the WinX menu. Type in any of the following commands only one :. Device Manager will be listed in the left panel under System Tools. Electronic Team, Inc.

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