COM Port Stress Test 

Simulate port activity for stress testing on your computer. Simulate a heavy load on your COM or RS232 port and check detailed reports on how programs and processes handle the loads in the optimal or regular manner. Check variables such as baud rate, data bits, flow control, stop bits, parity, RTS, and DTR.

COM Port Stress Test is a tool for testing a COM or RS232 port (device), that generates a serial stream of data with random communication settings. Stress test put a greater emphasis on robustness and error handling under a heavy load, than on what would be considered correct behavior under normal circumstances in your application. The goals of such tests may be to ensure the application doesn't crash in conditions of random data flow.