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Serial Port Monitor - RS232 Logger software to analyze COM port
FREE Serial Port Sniffer Easiest to Use! Works on RS-485, RS-232-, I2C, & others Sniffer for LabVIEW
PuTTY Tutorial for Serial COM (step-by-step guide)
How to sniff Modbus data with Serial Port Monitor?
How to Send a Hex Command over a Serial Port and Receive a response using RealTerm
Test Com/Serial Port - Free
Serial Port Monitor: analyze serial port activity
Serial Ports Are STILL Around!