DS-K1100 Series Card Reader
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reader, you must use RVVP cable above 0.5 to connect them.
If the card reader is installed outside or in environment easy to
permeable, it is advisable to install a waterproof shield.
If you need to install several card readers, the distance among them
must over 30cm.
To reduce the noise in long distance transmission, the shield of cable
should connect to the GND of both controller and card reader
terminal.