How To Use Portmon Hot! Page

PortMon is a time capsule—a perfect tool for the era of Windows 7 and RS-232 cables. If you work with CNC machines, medical devices, or industrial PLCs that refuse to die, PortMon is your best friend. It turns a black-box serial problem into a transparent, byte-by-byte conversation.

| Time | Process | Request | Offset | Data | |------|---------|---------|--------|------| | 0.001 | myapp.exe | IRP_MJ_CREATE | SUCCESS | | | 0.002 | myapp.exe | IOCTL_SERIAL_SET_BAUD_RATE | SUCCESS | 9600 | | 0.003 | myapp.exe | IRP_MJ_WRITE | SUCCESS | 48 65 6C 6C 6F | | 0.005 | myapp.exe | IRP_MJ_READ | SUCCESS | 4F 4B | 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 . PortMon is a time capsule—a perfect tool for

Pro tip: If you don’t know which COM port your device uses, check → Ports (COM & LPT) . | Time | Process | Request | Offset

Have a PortMon war story? Drop it in the comments below!