Black Widow Security BW X-Z Series Informations techniques télécharger pdf (Page 77)

Cable Type and Length

A flat modular phone cable is adequate for short runs between machines of

less than 15 feet. For cable runs longer than 15 feet it is best to place a

modular phone jack on the wall behind each machine and then run round

phone cable between the jacks. Flat cable can then be run the short dis-

tance from the wall jack to the machine. When using round cable and wall

jacks, care must be exercised in wiring these devices to assure proper wire

color orientation.

When placing any cable, avoid running next to any noise sources such as:

electrical wiring, fluorescent or neon light fixtures and do not make the cable

any longer than necessary.

Interface Connections

Connecting the machines together, creating the Bus, is a simple matter of

plugging the ends of the cables into the proper jacks at each machine.

Arachnid uses two jacks on each machine to accomplish this:

Communications In (COM IN) and Communications Out (COM OUT).

The machines are connected together using a COM IN to COM OUT proto-

col. For example: Connect one end of the 4-wire bus cable to COM IN on

the first machine and the other end of the cable to COM OUT on the second

machine. Adding another machine is simply a matter of continuing this pro-

tocol; COM IN on the second machine to COM OUT on the third machine.

Figures 8.3 to 8.6 illustrate various possible configurations.

When all the machines are connected together, the next step in creating the

network bus is to set the dip-switches.

Networking

8.5

Figure 8.3

Dip Switches 1, 2 and 3 “ON”

(Cut away view of

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Black Widow Security BW X-Z Series Informations techniques Page 77