Pelco C538M-A Manuel d'utilisateur télécharger pdf (Page 11)

10 Pelco Manual C1941M (7/98)

3.2.1 Input VCR Connectors

Physically, each of the four VCRC input connectors consists of the same number of

input screw-type terminals. Each input group uses a dual-row removable plug and

each plug is associated with 8 VCR inputs.

For example, refer to the leftmost group represented in Figure 5, which shows VCR

inputs 1-16. Of these VCR inputs, 1-8 are wired using the top 16 screw terminal

positions. VCR inputs on this connector physically alternate with their associated

GND connection for a total of 8 available VCR/GND connections: that is, pin 1 is

VCR input 1 and pin 2 is the GND connection associated with VCR input 1; pin 3 is

VCR input 2 and pin 4 is VCR input 2’s associated GND connection, and so on.

The same explanation applies to the lower plug for VCR inputs 9-16, starting with

VCR input 9 which is associated with physical pin 17 on the mating plug.

In a similar manner, the remaining plug (upper/lower) combinations accommodate

the three remaining VCR input blocks: that is, inputs 17-32 are handled by header

two, inputs 33-48 by header three, and inputs 49-64 by header four.

Figure 5. VCR Input Plugs

IMPORTANT:

Control cable

length should not be extended fur-

ther than the supplied 20 feet be-

cause resistive ladder input circuits

are very susceptible to additional

line impedance. It is also recom-

mended that shielded cable be used

to minimize external electrical inter-

ference with VCRC control signals.

See important note in Figure 9 re-

garding power hookup and interfer-

ence.

IS SHOWN IN THE TABLE BELOW.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 24 25

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Pelco C538M-A Manuel d'utilisateur Page 11