4-port, USB to Serial

USB-4COM ECO

4-port, RS232, DB9M. ESD-protection.
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USB-4COM Plus ISO

4-port, RS232/422/485, DB9M, surge protected, opto-isolated, expandable via USB.
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USB-4COM Plus 232

4-port, RS232 DB9M, non-isolated, expandable via USB.
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USB-4COM Plus

4-port, RS232/422/485 DB9M, surge protected, expandable.
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