Therefore, if it's required to test a certain application for a special occurrence of characters, experts start looking for solutions.

In some cases, it's not possible to modify the hardware device. While developing serial apps, programmers may face some difficulties related to program testing. Later, the data will be used for making reports, creating various GUI objects, generating graphs, etc. Once connected, serial programs can get particular data from industrial equipment, process it, and store it in a single database. As a rule, such serial apps communicate with required hardware via COM interfaces which in turn are linked with a serial cable. It often happens that to receive data from a particular device, specialists need to use dedicated serial applications.

Close the window for the port that you just tested to speed up the testing of the remaining serial ports.įor products related to this article, click here.Serial communication is an integral part of a production environment where numerous specialized devices exchange data via serial interfaces. When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is.

You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session. If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port. The loopback test fails when you cannot see what you are typing. When the session is open, anything you type into it you should see.Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. To find out the COM port number, refer to the following FAQ. Open a telnet session on the COM port number of the device that you are testing.If you look closely at the female end, the pins should be numbered. Take a metal paperclip or wire and cross pins 2 and 3.If your serial port is not female, convert it by taking a female/female cable or gender changer and plugging it into the serial port.To check whether or not an RS-232 serial port is working, perform an RS-232 loopback test by doing the following:

Windows 10 serial port test