“Serial debugging without a monitor is like lip-reading through a brick wall.” Fire up PortMon, watch the bytes flow, and fix that ancient hardware.
Here is what a typical capture looks like: how to use portmon
If you have ever found yourself scratching your head wondering, "Is my software sending the wrong data, or is the peripheral just ignoring me?" — you need . “Serial debugging without a monitor is like lip-reading
Portmon is a popular, open-source network traffic capture and analysis tool. It allows users to capture, analyze, and visualize network traffic on a specific port or range of ports. In this guide, we will walk you through the steps to use Portmon effectively. It allows users to capture, analyze, and visualize
PortMon (Port Monitor) is a classic, lightweight utility from Microsoft’s Sysinternals suite (written by Mark Russinovich). Although it is legacy software (last updated for Windows XP/7), it remains an indispensable tool for debugging serial (RS-232) and parallel port communication on older systems or within virtual machines.