RCI RPTZ1080-18X+CTP18AH108, User Manual

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HD IR AHD Intelligent High Speed Dome User Manual
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Appendix 1 Lighting and surge protection
This product adopts TVS plate lightning protection technology to avoid damage caused by pulse signal that is
below 3000W, like instantaneous lighting, surging, etc. According to the actual situation outdoors, necessary
protection measures must be taken to secure the electrical safety.
1. The distance between signal transmission line and High-voltage equipment or high-voltage cable is at least
50m.
2. Outdoor wiring should better be along the eaves as much as possible.
3 In the open field, wiring should be buried underground in sealed steel pipe, and the steel-pipe should be
one-point grounding. Overhead routing method is forbidden.
4. In strong thunderstorm area or high induction voltage areas (such as high-voltage transformer substation),
high power lightning protection apparatus and lightning conductor are necessary to be appended.
5. The design for installation and wiring with lightning protection and grounding in mind should be combined
with the lightning protection consideration of the building, and conform to the related national standards and
industry standards.
6. The system should be equipotentially grounded, and the grounding equipment must satisfy double-request
of system anti-jamming and electric safety, and it must not appear short circuit and open circuit with the zero
conductor of strong grid. When the system is grounding individual, the resistance should be no more than 4Ω, the
section al area of the grounding cable should be no less than 25mm
2
.
Appendix 2 RS485 Bus Connection
1. General Property of RS485 Bus
According to RS485 industry bus standard, RS485 is a half-
duplex communication bus which has 120Ω
characteristic impendence; the maximum load ability is 32 payloads (including controller device and controlled
device).
2. RS485 Bus Transmission Distance
When using 0.75mm (24AWG) twisted-pair line, according to different baud rate, the max transmission
distance theory table is shown as below:
Baud Rate Max Distance
2400BPS 1800m
4800BPS 1200m
9600BPS 800m