When the message "An unusable COM port was specifi | FAQ

FAQ > Controllers > Programmable Controllers MELSEC > MELSEC-Q Series > When the message "An unusable COM port was specified" is displayed

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No : 22517
Release Date : 2018/09/03 17:28
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When the message "An unusable COM port was specified" is displayed

A universal model QCPU is connected with a USB cable, but the message "An unusable COM port was specified" is displayed and communication cannot be established. What is the solution?

Category :

FAQ > Controllers > Programmable Controllers MELSEC > MELSEC-Q Series

Answer

RS-232 is selected as PC side I/F in Transfer Setup of GX Developer or GX Works2.
Change the setting in PC side I/F to USB.

Product Name: Engineering Software

Series: Software Package (GPP function)