How to check serial com port is working

The typical method is to follow these general troubleshooting guidelines. We recommend that by developing an understanding of how serial devices work, you can save a substantial amount of time when taking down issues. A program like Serial Port Tester can be instrumental in increasing your knowledge of serial communication. There is an effective and efficient method of investigating issues that you may encounter during the development and testing of a serial device driver or application.

In our demonstration, we will use Electronic Team's, Inc. Serial Port Tester as the program with which to test serial ports.

We will show how to check an RS port is working in three different ways. Download and install Serial Port Tester. Launch the app and open a new monitoring session by following the next step. Second case: Compare monitoring sessions Many valuable insights about your serial communication can be gained by a comparison of two saved sessions. Saving a monitoring session prior to making any changes and then saving a subsequent session provides the data with which to make your comparison.

Differences in the sessions can easily be identified. To send data to a serial port follow these steps:. Serial Port Tester is a versatile utility that can be extremely useful in many scenarios involving serial communication and devices.

We have demonstrated some popular uses of the tool. You will find it a valuable addition to your software toolbox for identifying issues with serial devices and applications. Eltima IBC uses cookies to personalize your experience on our website. By continuing to use this site, you agree to our cookie policy. Click here to learn more. The Advanced Settings window is where you perform the number reassignment. You select an available port number from the list presented in the lower-left of the window.

Save the settings by clicking the OK button. This will close the open windows. The new number may not be assigned until the device is removed and reconnected to the computer. You will see the ports currently in use along with their designated port identifier.

Right-click on the device whose designation you want to change and select Properties. Click on Port Settings and then click the Advanced button. Click the Com Port Number to change the currently assigned port identifier. Click OK on all open Property windows.

Some of the uses of the software include testing and debugging in usage scenarios that include: Verifying the functionality of serial applications for intercepting data transmitted over the network; Troubleshooting serial applications which are using null-modem connections; Developing firmware for devices that are not physically located near your computer; Testing virtual serial port emulators such as GPS, fax, and other devices.

Frequently Asked Questions. How to find Device Manager on Windows 10? There are a number of way to access the Device Manager in Windows Using Windows Search The easiest way is to use the default Windows search bar located next to the Start Menu on the toolbar.

Device Manager will be listed as an option in the menu that appears. Type in any of the following commands only one : devmgmt. How to find COM port number on Windows 10? Expand the group to view your device.

The port along with the port number ie. Communications Port COM4 will be displayed accordingly. How to install a serial port driver? Follow the steps in the installation wizard. Read and accept the License Agreement, and click Next to continue. Get a download link for your desktop Submit your email address to get a link for quick download on your desktop and get started!

The download link was sent to you, check your email. Latest version. Latest version: v 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.

Conclusion this device is faulty one, I drawn from test Card reader on another comp and this one was showing two led lights on ,but in normal state these led should be off. So I change the Standard RS cable, but result was as before- no fix. Anyhow what rest is my Serial port COM1 who probably not working properly.

Goggled searching for simple method to test it, but all what I found didn't help me. Thanks for any assistance. Serial port cards used to be very cheap. If they still are, buy and install one. This can be solution if this card is available on the market. What is confusing me is a fact I can not test this Communication Port and there is no application suitable to do this job.

Run hyperterm on com1. You can use a paper clip as the jumper for a socket. There are also handshake pins that are used with devices but hyperterm, IIRC, will communicate without them being active. If you will need to test often you might consider getting a 25s or 9s, whichever size the com port will take and permanently make a loopback plug.

The link I posted back in June, shows how to create the loopback plug for testing the port, and also the commands and different programs to use to test, using the plug. Try also to transfer file or capture text, but after while received "connection timeout" and at the end "Error limit exceeded" On the lower left part of the Hyperterminal window is shown as "Connected" Don't know what to do else.

I don't have a system set up now to look at the hyperterm requirements. I'll post back tomorrow after I've modified one. At the beginning all looks fine, led didn't light, but after start Card reading on COM 2, received message "Error Also try with other Card Reader — same result. All this bring me to conclusion my Serial Card two ports is gone.

Only one thing what I would like to define is to precise what caused this — hardware mater or software- something related to Windows XP SP3. ESD damage When you run hyperterm the connected at the bottom left only indicates that there is a com port recognized, it has nothing to do with anything possibly connected on the other side of the chip.