ECS Series Emergency Communication System Installation Manual 151455
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4.7.5.3 Class A
Figure 4-47 illustrates how to wire speakers to the control panel using Class A wiring.
Figure 4-47 Class A Speaker Configuration
4.7.6 VBUS Wiring
The VBUS is an analog voice bus that carries the recorded voice messages from the ECS-VCM or
ECS-NVCM to the ECS-125Ws, or the voice messages generated from a system microphone to the
ECS-125Ws. The maximum resistance on the VBUS is 20Ω.
Connect the VBUS from the ECS-VCM to the ECS-125Ws as shown in Figure 4-48 or for ECS-NVCM,
see Figure 4-49.
Figure 4-48 VBUS Wiring for ECS-VCM
15kΩ
EOL
at Last panel
Supervised
Power Limited
ECS-VCM
ECS-125W
ECS-125W
To next
ECS-125W
on the VBUS
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