16
The 4100U or 4100ES may be connected to the 4100 Legacy Audio Controller via the 4100U
Audio Riser and the Network input on the Legacy Controller. The 4100U and 4100ES use a
10VRMS Analog Audio riser. In order to interface to a legacy 4100 Audio Controller Network
input, an isolation/step-down transformer must be used. This is an existing product, the Audio
Isolator Assembly, PN 742-302. The setup is slightly different from the instructions that are
supplied with the module. Following are the modified installation instructions:
1. Connect the incoming nominal 10 VRMS 4100U/4100ES Audio Riser wiring to TB1 on
the audio isolator. If the installation requires IN and OUT wiring, two wires may be
installed under each screw of TB1.
Note: The in and out wiring must be two separate wires. Do not loop the
wire around the TB1 screws.
2. If there is only one audio wire pair coming into the panel, isolate and tape back the shield
with high quality electrical tape.
3. If the installation requires IN and OUT wiring, install as indicated in Step 1 above,
connect the shields of the incoming and outgoing wires together to maintain continuity of
the shield. The preferable method is to twist the shields together, solder and cover with a
high quality electrical tape.
Figure 9. Audio Board Controller Configuration
Follow Steps 1 through 5 and Figure 9 to properly align the audio controller board after installing
the audio isolator.
1. Ensure the jumper wire on the isolator assembly is connected to Post D.
2. Remove R85, R90, and C118 from the Audio Controller Board (562-894).
3. Verify there is a nominal 10 VRMS riser supervisory signal (1Khz Sine Wave) into the
isolator.
4. Using the AC scale of an appropriate meter (e.g., Fluke 12, Fluke 75) measure the level at
TP6 using TB2-2 of the audio controller as a reference.
5. If needed, adjust R88 on the audio controller for a level of 0.5 VAC.
Wiring,
Continued
Connecting the
4100U/4100ES Analog
Riser to Legacy 4100
Aligning the Audio
Controller
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