Configure Serial Port Windows 7

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You access the COM port through an instance of the COM port device interface class. The GUID for this class is GUID_DEVINTERFACE_COMPORT, which is defined in Ntddser.h. You operate the COM port by using the 16550 UART-compatible interface that is defined in Ntddser.h. To ensure compatibility with most applications that access COM ports, you should assign a symbolic link name that uses the standard naming convention "COM", where is the COM port number (for example, COM1).

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If you use a COM name, you must obtain the COM port number from the COM port database. COM port numbers should only be used with COM names. Do you get any error message while trying to configure the COM port? I would suggest you to try the following steps and check if it helps. a) Plug the device that requires the COM Port to be used. b) Open Device Manager by doing the following:. i)Click on “Start” and then “Control Panel.”. ii) Switch to Classic View (if in Category View). iii) Double click on “Device Manager” button. c) Expand “Ports”. d) Right click on the Device and click on Properties. e) Click on the "Port Settings" tab. Click the "Advanced" button. f) Click on “COM Port Number.”. g) Pull down the scrollbar and select “COM1.” . If there is no COM port or Other Device showing in Device Manager you need to enable the serial/COM port in the laptop BIOS, assuming the laptop has a COM port.

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Important: Modifying BIOS/complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk. This topic describes programming traditional COM ports. For information on USB attached serial ports, see USB serial driver (Usbser.sys). Provide an INF file that specifies the Ports device setup class and the Serial function driver as the service for the port. To configure a serial port as COM port, comply with the requirements that are defined in Configuration of COM Ports.

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Some times you need to access serial port of your PC/LAPTOP to perform some actions like if you want to connect a GSM modem or if you are an Embedded systems programmer then to access program or interface your micro-controllers to your system. If you are performing these tasks on either Windows or Linux then you will requires some program that can communicate with your hardware and system.

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In the old days, Windows used to be provided Hyper terminal but now from Windows Vista they don’t provide such a tool, could not understand the reason though . How ever you can still use Hyper terminal in Windows 7 as well as you can use other freely available serial communication utilities like Putty.

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Putty is a great and free tool and available for both Windows and Linux platforms. If your system does not have any serial port , you can still use a USB-to-Serial adapter When you buy a USB-to-Serial port adapter you will get a driver for it as well. This driver makes a virtual serial port in your system. In Windows, serial port named as COM port. If you want to use Hyper terminal than you have to download this file. If you want to use Putty than download this file from here.

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Now you have to follow below steps to communicate with your device:. Step – 1: Connect your device with your system through RS-232 cable or USB-to-Serial adapter and check whether it’s connected successfully or not. Step – 2: Open device manager and check for COM ports , it get assigned a COM port or not. See below screen shot. If you are not aware about accessing device manager then follow this post. Step – 3: Note down the “COM port number” as we will require it. Step – 4: Check user manuals or other reference documents related to your hardware for the following information:. Above properties are critical to make the communication correctly, if you don’t configure these properties properly then you will get either junk data or no data.

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If you are going to use Hyper terminal than follow Step-5 to Step-9 otherwise follow Step-10 to Step-12. Serial Communication using Hyper Terminal. Step – 5 a Extract the downloaded “hypertermina.rar” file in your system, open the “Hyper terminal” folder and double click on hyper terminal application. You should see the window like the screen shot given below. Step – 5 b Insert a name for the connection, for ex.

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Step – 5 c Select your “COM” i.e Serial port. Step – 5 d You will see the window like below screen shot. Set the values, you noted before remember i.e. According to your device requirements. Step – 5 e Now you are ready to communicate with your device. I am inserting a screen shot which shows a messages received by the device. Step – 6 a By default you wont see the character you type,but if want to see the character you type that is going to received by your device then you have to click on ‘properties’, you will see the window like below:. Step – 6 b Click on “settings”, you will see the window like below, click on ‘ASCII Setup’. Step-6 c Select “Echo typed character locally”, see screen shot below:.


Step – 7 a If you want to receive a file from your device the click on ‘settings’, then select ‘Receive file’ option. Step – 7 b Choose the receiving protocol whatever your device support, see attached screen shot.

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Step – 8 If you want to send a file , then select “Send file” option and sending protocol. Step – 9 Similarly you can capture the text and save it in a file. Serial Communication using Putty. Step – 10 Double click on downloaded ‘Putty.exe’, you will see a window like this:. Step – 11 Select ‘serial’, insert com port and baud rate value and click on ‘Serial’ (Left pan), you will see a window look like this:.

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Step – 12 Enter all the setting according your device and then click on open,. Step -13 After clicking on ‘open’, you will see a window like this, now you are ready to communicate with your device.


Putty is much more than a simple serial port communication tool, I will cover more on Putty in my future post.

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For now, that’s all now you can communicate with your device using serial port, Please like and share if you find it useful.

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