23
46535.550E
EN
Appendix 1: Anti-lightning, Anti-surge.
This product is extremely air discharge and lightning protection with TVS tube technology, which can effectively prevent the transient lightning below volt-
age 3000 V, surge and damages caused by other types of pulse signals.
However, necessary protective measures should be made in the premise of ensuring electrical safety for outdoor installation according to the actual situ-
ation :
· Signal transmission line must be at least 50 meters far away from the high-voltage equipment or high voltage cable.
· Try to choose outdoor wiring laid down along the roof line.
· Way of sealed steel pipe buried wiring is used in the area which opened, and steel pipe units grounded in one point. Overhead wiring is absolutely
prohibited.
· In the strong thunderstorms area or areas with high induced voltage (such as high voltage substations), measure of installation of additional high power
lightning protection equipment and lightning rod must be taken.
· Lightning protection and grounding of outdoor devices and lines must take the lightning-protection requirements of buildings into consideration, and
comply with the related national standards and industry standards.
· System must have proper ground protection. Grounding device must meet dual requirements of anti-interference and electrical safety, and should not
be shorted or mixed with the adjacent lines in the strong power grid. When system is independently grounded, grounding impedance should be less
than 4Ω, and cross-sectional area of grounding conductor must be not less than 25mm
2
.
Video Arrester
Comm. Lighting Arrester
Power Arrester
Power ground wire is not
more than 4Ω
Steel Sheath
Lighting Rod
45 degree
Dome must be under
45 degree range
Fig. 1
Appendix 2: Clean Transparent Cover.
In order to assure a clear image of dome, the under cover of dome should be cleaned regularly.
- Be careful when cleaning and hold the outer ring of under cover by hands to avoid directly touching with it. Because the acid sweat of finger membrane
may corrode the surface coating of under cover. Hard tool scratching the under cover may lead to blurring the images of dome so that affecting image
quality.
- Please use a soft enough dry cloth or other alternatives to wipe internal and external surface.
- If dirt is serious, user can use a mild detergent. Any senior furniture cleaning products can be used to clean the under cover.
Appendix 3: Common Knowledge on RS-485 Bus.
1 - Basic Feature of RS-485 bus.
According to industry bus standard of RS-485, RS-485 bus is half-duplex communication bus with the characteristic impedance of 120Ω, whose ma-
ximum load capacity is 32 payloads (including the master device and the controlled device).
2 - Mode of Connection and Terminal Resistance.
Industry standard of RS485 bus requires that connection mode of daisy chain should be used between the devices with 120Ω terminal resistances
connected at the both ends.
As shown in fig. 2 and fig. 3 is simplified connection, but the distance of part "D" shall not beyond 7 meters.
Fig. 2
Fig. 3
