Vicon Surveyor 99, Руководство по установке и эксплуатации

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Reference XX002 Rev 799 Surveyor99 Dome System
Twisted-Pair Cable
CAUTION: Careful selection of the proper cable is essential to obtain the best performance from this
equipment. Vicon assumes no responsibility for poor performance when cables other than
those recommended are installed.
Materials
Use a pure copper stranded conductor with or without a tin plating to obtain a low DC resistance. Do not use cable with
either a steel or an aluminum stranded conductor because these do not transfer signals effectively for long distances.
The preferred insulation and cable jacket is Polyvinyl chloride (PVC). It has better electrical characteristics than
polyethylene and resists flames, sunlight and most solvents, but is more vulnerable to moisture.
Cable Types
The most commonly used cable types are dual individually-shielded, twisted pair in a single jacket. This configuration is
the most convenient for RS-422/ RS485 applications. Single twisted pair is also a suitable cable.
Choose a Belden cable type by referring to the characteristics and maximum distances listed below. The maximum
distance for the most reliable digital control refers to the distance between the CPU/Keypad and the Camera Dome
Assembly. The characteristics of the cables in Table 5 should be used as a guideline when cables other than Belden are
used. Materials and construction must follow the guidelines above.
¹
Datalene is a Registered Trademark of Belden.
Table 5
Recommended Individually-Shielded, Twisted-Pair Cable Types
1.0-inch Pipe Designation
The standard “1.0-inch pipe” referred to in this manual has actual dimensions of:
Outside diameter: 1.315 inches (33.4 mm).
Inside diameter: 1.049 inches (26.6 mm).
Wall thickness: 0.133 inches (3.38 mm) minimum (ANSI “standard” grade thickness).
CABLE
TYPE
WIRE SIZE
(AWG)
INSULATION
MATERIAL
JACKET
MATERIAL
DISTANCE ft (m)
max.
NUMBER OF
TWISTED PAIRS
Belden 9406 22 PVC PVC 5000 (1500)
2
Belden 9402 20 PVC PVC 5000 (1500)
2
Belden 8723 22 Polypropylene PVC 8000 (2400)
2
Belden 8162
24 Datalene¹ PVC 15000 (4600)
2
Belden 9729 24 Datalene¹ PVC 15000 (4600)
2
Belden 9182
22 Datalene¹ PVC 25000 (7600) 1