Extron electronic Extron Electronics Switch RGB 326 User Manual download pdf (Page 11)

RGB 324/326/340 • Installation and Operation

Installation and Operation, cont’d

2-10 2-11

Metal Wall Box

Screw

Braided Shield

Installation Cable

Foil Shield

Cable Clamp

To prevent short circuits, the outer foil sheild can be

cut back to the point where the cable exits the cable

clamp. Trim back or use heat shrink to insulate all

shields (braided or foil) from the circuit board. If

shields contact the circuit board, a short circuit may

occur. Also, both the braided and foil sheilds should

be connected to an equipment ground at the other

end of the cable.

Connecting the buffer to the RGB 320

with installation cable

The cabling examples on page 2-14 and 2-15 show a buffer

wired for RGBHV video and balanced audio output using

seventeen conductor plenum installation cable.

Extron recommends using Extron’s seventeen conductor bulk

plenum installation cable (part numbers 22-111-03, 22-111-04) or

equivalent. Installation cable includes coaxial cables for video

signals, shielded twisted pair wires for audio, and single

conductors for power and communications signals.

Connect the cables between the buffer and the

RGB 320 interface on a one-to-one basis. Cable

conductor assignments must be the same at both

ends of the cable, or damage may occur to circuits

in the buffer and/or the RGB 320.

Remove power from both the buffer and the

RGB 320 while cables are being attached.

Preparing and terminating the cable

Use the illustrations on pages 2-14 and 2-15 as wiring guides.

They show connectors and conductor assignments for the buffers

and the RGB 320.

1. Select and install a multiconductor cable, such as the

Extron Plenum seventeen conductor installation cable, which

contains appropriate conductors (at least 5 coaxial, 3 sets

of shielded twisted pair, 3 single 20 AWG) for the video,

power, control, and audio signals that this system will use.

4. Remove the Adjust knob. You may need a very small

diameter Allen wrench to loosen the nut that holds it in

place.

5. Slide the top part of the enclosure slightly forward, then

upward to remove the cover. The circuit board remains in

the bottom portion of the enclosure.

H-SHIFT

HIGH-Z

INPUTS

ANALOG

AUDIO

SHOW ME/

SELECT

V-SHIFT

VIDEO LEVEL

AUDIO LEVEL ADJUST

Remove (5)

Screws

Remove (2)

Connector Nuts

and Knob

Opening the RGB 340 enclosure

6. Set the level/peaking jumpers. See the jumper diagram on

page 2-9.

7. Reverse steps 2 through 5 to replace the cover.

Cabling

All the output, power, and control cables from the RGB 324,

RGB 326, and RGB 340 buffers go directly to the RGB 320

switching interface. Refer to the RGB 320 User’s Manual and see

“Connecting the buffer to the RGB 320 with installation cable”

in this chapter when making and connecting cables for the

buffers. Run the cables through the wall/furniture and into the

electrical box (if used) before attaching connectors.

Input connections

Input connections and audio input connector wiring are

discussed on page 2-5.

Connecting shields

Multiconductor cables contain several braided and foil shields.

At the buffer end of the cable, the outer braided and foil shields

should be connected to the grounded metal wall box (or to a

grounding wire if a metal wall box is not used). The wires that

make up the braided shield can be unbraided, then twisted

together to form a large, multi-strand wire that can be folded

back under the wall box cable clamp or attached to the metal

wall box with a screw. See the following illustration.

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Extron electronic Extron Electronics Switch RGB 326 User Manual Page 11

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