Even though a tool is portable, accessing hardware serial ports on modern Windows (Vista onward) may require membership in the Users group with device access permissions. On locked-down corporate PCs, you might encounter “Access Denied” when opening COM ports > COM9. Solutions include:
Keep a copy on a lanyard USB drive. When a machine stops communicating 50 feet up in a scissor lift, you’ll thank yourself for going portable. serial port monitor portable
If you work with embedded systems, GPS modules, or industrial equipment, you know the drill. You’re deep in the field, a device is acting up, and you need to see exactly what’s coming through the COM port. Even though a tool is portable, accessing hardware