HomeMatic HM-CFG-USB-2 Installation And Operating Manual page 21

5. Connect the wireless configuration tool USB to a
USB interface on the PC. If a connection behind
the PC is not functional for mechanical reasons
or due to poor reception conditions, the attached
USB extension cable can be used.
Please do only use the attached USB extension
cable if you want to place the device detached
from the PC.
6. The PC detects the wireless configuration tool
USB automatically; there is no need to install
separate drivers.
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