What (Windows 7, 10, 11) is installed on your PC?

A standard straight-through serial cable will not work. CNC communication requires a null modem cable configuration with crossed RX/TX data lines. Recommended RS-232 Null Modem Pinout (9-Pin to 9-Pin) PC Connector (DB9 Female) CNC Control Connector (DB9 Female/Male) Signal Name RxD / TxD (Crossed) TxD / RxD (Crossed) GND (Signal Ground) WinPCIN Siemens Software Download Options

Right-click on setup.exe or WinPCIN.exe and select .