Downloading CommTest 3.2.0.17 from our website was free. The program's installer is commonly called CommTest.exe, ComTest.exe or MTD2Test.exe etc. The most popular versions among the program users are 3.2, 1.1 and 1.0. The latest version of the program can be installed on PCs running Windows XP/Vista/7/8/10/11, 32-bit. This free software is a product of G R Freeth. CommTest lies within Internet & Network Tools, more precisely Network Tools.
From the developer:
CommTest - a program to test Com ports and cables when it comes to plugged in radios. Ensure that your PC has at least one free COM port. For example, if your PC has two but one is used for the mouse and the other is used internally to drive a modem then you have none free! You should purchase and install a serial port card in your PC.
They are cheap and available at all computer stores.
You may want to check out more software, such as Roadkil's CommTest, which might be related to CommTest.