USB-MPI Programming Cable for Siemens S7-200 300 400 Series 6ES7 972-0CB20-0XA0 PLC 0CB20 USB MPI/PPI/DP/PROFIBUS USB MPI PC-MPI Adapter: Amazon.com: Tools & Home Improvement
Profibus USB Interface with Converter for PROFIBUS PA-Networks - Tech Automation
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USB RS485 insulated converter with termination and polarization. Profibus master | eBay