Solution: Mismatched baud rate or parity. Start with 9600,8,N,1. If hex data looks sane (e.g., 0D 0A every line), it’s likely a baud mismatch. Try standard rates: 4800, 9600, 19200, 115200.

Right-click Sscom.exe → Run as Administrator. This is required for direct hardware access on Windows 10/11.

Your motor driver accepts commands like :M 200\r\n for 200 steps. Use Sscom’s Multi-string Send:

OK OK OK OK OK OK OK