Black BLK-HDPTZ12 Manual de usuario descargar pdf (Pagina 9)

32MP 12X PTZ HD-SDI/HDcctv Dome Camera

SECTION 1: INTRODUCTION

In the diagram above, video output from each camera on the network is applied to a distribution box (J-box), then connected to a

multiplexer, DVR/VCR, and monitor.

The PTZ features of the cameras are controlled across an RS-485 network with a PTZ controller. Up to 99 BLK-HDPTZ12 cameras can

be attached to a single RS-485 network.

1.2.1 RS-485 network termination

RS-485 networks are usually congured as a series of point-to-point (multidrop) nodes, a line or a bus (star or ring congured

networks are not recommended). Termination resisters are required for devices at the ends of the bus to reduce signal reections

in the network that can cause data corruption. The value of each termination resistor should be equal to the cable characteristic

impedance, typically 120 ohms for twisted pair cable. In the following illustration of network examples, the grayed devices are

congured to apply termination to the RS-485 bus.

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Black BLK-HDPTZ12 Manual de usuario Pagina 9