QSC DDI-8-C Owners manual

DDI-8c

DataPort Accessory Card

INSTALLATION GUIDE

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DDI-8c

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*TD-000230-TS*

Rev. B

COMMON B

Instructions for the DDI-8c DataPort Accessory Card

COMMON BCOMMON B

Normal

Auxiliary

COMMON A

AUX 1

AUX 2

GND

RLY NC

RLY COM

RLY NO

STBY_O

STBY

GND

RMT_I

AUX 1 & AUX 2

GND

STBY_0

STBY

To second DDI-8c

First DDI-8c

I. INTRODUCTION

The DDI-8c DataPort Accessory Card is specially designed for cinema applications using QSC DCA Series amplifiers, a BASIS processor, and a DSP-30 loaded with a cinema bypass preset.

When wired to a DPDT switch as shown in Figure 1, it allows the projectionist or operator to switch the amplifier inputs over to auxiliary audio sources, fed by a DSP-30, in the event of a failure of the BASIS unit. See Figure 3 for a block diagram of the backup system arrangement.

The DDI-8c DataPort Accessory Card mounts to the back of any two-channel QSC DCA Series power amplifier. Two small LEDs near the right edge of the its circuit board indicate when the auxiliary inputs are enabled.

II. INSTALLATION

Normal

Auxiliary

COMMON A

COMMON B

LEDs light when aux inputs are enabled.

The DDI-8c kit (QSC part # SG-000523-00) includes these items:

DDI-8c card Threaded standoff 8-32 × 0.375”; QSC part # HW-000110-TS

Figure 1. The DDI-8c

DPDT Control Switch

Phillips screw 8-32 × 0.315”, black; QSC part # SC-080051-PP Two Phillips screws #4-40 × ¼”, black; QSC part # SC-040041-PP Two 3-pin Phoenix Euro-style connectors; QSC part # CO-000198-00 Installation guide; QSC part # TD-000230-TS

Parts, materials, and tools needed:

Latching (i.e., not momentary) DPDT switch—pushbutton, toggle, etc. Insulated hookup wire Shielded balanced audio cable QSC DSP-30 processor with cinema bypass preset loaded Male and female XLR connectors (for connection to DSP-30)

Use this procedure to install the DDI-8c:

1. Turn off the amplifier.

2. On the rear panel of the amp, thread the hex standoff into the mounting hole to the right of the “Parallel Input” DIP switches. Tighten it securely.

3. Plug the DDI-8c into the amplifier’s DataPort.

Figure 2. Connecting multiple DDI-8c boards to one switch.

4 Use the two 4-40 screws included to secure the DDI-8c to the amplifier’s DataPort.

5. Use the 8-32 screw included in the kit to secure the right side of the DDI-8c to the hex standoff.

6. Locate the DSP-30 near the amplifier. Using the female XLR and Phoenix connectors as well as the balanced shielded cable, connect the DSP-30’s outputs,1 and 2, to the respective aux inputs of the DDI-8c.

7. Connect input 1 of the DSP-30 to the cinema processor’s

Hearing Impaired

output. This output will serve as the emergency audio signal

source.

8. Wire the DPDT switch to the DDI-8c as shown in Figure 1.

9. The system is ready for use.

CONNECTING MULTIPLE DDI-8C BOARDS

You can control multiple DDI-8c boards on the same DPDT switch. The connections to AUX 1, AUX 2, and GND can simply be linked together in parallel (see Figure 2). The standby connections (STBY and STBY_0) cannot be paralleled and must be cascaded, though; connect the switch to STBY and STBY_0 on the first DDI-8c board, and then connect RLY COM and RLY NC on that board to STBY and STBY_0 on the next DDI-8c board.

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