Extron electronic Cabling, 2-10RGB 324/326/340 Installation and Operation, Input connections

Installation and Operation, cont’d

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.

AUDIO	INPUTS
	ANALOG
	HIGH-Z	SHOW ME/
		SELECT	H-SHIFT
			V-SHIFT
			VIDEO LEVEL
			AUDIO LEVEL
			ADJUST

Remove (2)
Connector Nuts	Remove (5)
and Knob
	Screws

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.

Metal Wall Box

Cable Clamp Screw

Braided Shield

Installation Cable

Foil Shield

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-onebasis. 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.

2-10 RGB 324/326/340 • Installation and Operation RGB 324/326/340 • Installation and Operation 2-11