Bolin Technology VCC-7 Series User Manual page 21

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Use extension cables included RJ45 to RS422 Phoenix connecter adaptor to make RS485 connection for your control device.
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Or you can use CAT5/6 T-568B Standard Ethernet cable direct connect between the camera and the controller to make
RS485 connection by following the pin definition below:
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How to make RS485 multiple cameras connection with RS485 standard serial port controller:
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