Extron electronic MSW 4V SDI rs user manual 6 - Power wiring, Installation and Operation, cont’d

Installation and Operation, cont’d

See chapter 3, “Serial Communication” for Simple Instruction Set (SIS) commands to communicate with the MSW 4V SDI rs via RS-232.

D	Contact connector — Connect a remote contact	CONTACT
	closure device to the MSW for remote control
	of the switcher, or daisy chain it to other MSWs		2	3
	for remote control of all the units, via this 5-pin	1			4
	captive screw connector.

NThe switcher must be in normal (manual) mode for contact closure to work. See "Mode selection", later in this chapter.

To select an input using a contact closure device, such as an Extron CCR 204 contact closure remote control (part #60-794-02) or a locally constructed device, momentarily short the pin for the desired input number to logic ground (pin 5). To force one of the inputs to be always selected, leave the short in place. The short overrides any front panel input selections.

You can also daisy chain multiple MSWs via the Contact connector for front panel control of all switchers; touch the input button on one MSW to switch all MSWs. Wire pin 1 to pin 1, pin 2 to pin 2, and so on.

E	Power connector — Plug the external 12 VDC power supply
	into this 2-pin, 3.5 mm captive screw connector. The power
	supply is included with the unit.

In the event that power is disconnected from the MSW, the unit retains mode and input settings.

NThe power connector on the rear panel is orange; however, the plug for the power cord may be either orange or blue. Either color plug can be connected to the rear panel receptacle.

To wire the connector, do the following:

1.Cut the DC output cord to the length needed.

2.Strip the jacket to expose 0.2” (5 mm) of the conductors for the blue captive screw plug, or 0.3” (7 mm) for the orange plug.

Smooth	Ridges
A	A

SECTION A–A

Power Supply	Tie Wrap
Output Cord

0.3” (7 mm) MAX

Orange Captive Screw

Connector

Figure 2-6 — Power wiring

WExposing more than the amount of wire described above could allow the stripped wires to touch each other, causing a short circuit. This could result in the external DC power supply overheating and/or burning.

NStripping the wires to expose less than the recommended amount causes them to slide out of the connector too easily, even if they are tightly pinched by the captive screws.

3.Slide the leads into the supplied captive screw plug and lock them, using an Extron Tweeker (small screwdriver).

4.Use the supplied tie-wrap to strap the power cord to the extended tail of the connector.

5.To verify the power cord’s polarity before connecting it, plug in the power supply with no load and check the output with a voltmeter.

CDo not tin the stripped power supply leads before installing the captive screw connector. Tinned wires are not as secure in the captive screw connectors and can be easily pulled out. They may also break after being bent several times.

WThe two power cord wires must be kept separate while the power supply is plugged in. Remove power before wiring.

Alternately, an Extron PS 123 12 VDC, 3 amp power supply, (part #60-814-01), can power up to eight MSWs or other Extron 12 VDC devices using only one AC power connector.

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