Monitor and Analyze Your Serial Ports and Hardware Devices
Free Serial Port Monitor allows you to intercept, display and analyze all data exchanged between the Windows application and the serial device. It can be successfully used in application development, device driver or serial hardware development and offers the powerful platform for effective coding, testing and optimization.
http://www.serial-port-monitor.com/index.htmlNote: Version 3.31 this is tested and I do recommend it to ITTSB Blog readers.