Samsung SHR-9716 - Manual (Page 13)

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connecting with other devices _ 09
RS485 CONNECTION
It's possible to control an external device by the DVR using the RS485 interface for communication.
The RS485 port can be used to control PTZ cameras, speed domes, keyboard controllers and other types of external
devices.
Connect the Rx+/Tx+ & Rx-/Tx- of the external device to the + & - of the RS485 port respectively.
Warning
 Check the polarity (+/-) when making the connection. Faulty wiring can damage both devices.
 Electrical Hazard: Please carefully read through the Safety Warnings and Precautions section.
 It’s not possible to connect a PTZ device and a keypad device (SSC-2000) to the RS485 port and use the two
devices at the same time. In order to use a PTZ device with a keypad or another type of external device, you
will need to install a separate COM port expansion card.
SPR-9816-9716.indb 9 2008-07-03 오후 2:46:24