Class A; Vbus Wiring - Honeywell ECS Series Installation And Operation Manual

ECS Series Emergency Communication System Installation Manual

4.7.5.3 Class A

Figure 4-47 illustrates how to wire speakers to the control panel using Class A wiring.
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.
ECS-125W
Supervised
Power Limited
Figure 4-47 Class A Speaker Configuration
To next
ECS-125W
ECS-125W
Figure 4-48 VBUS Wiring for ECS-VCM
ECS-VCM
15kΩ EOL
at Last panel
on the VBUS
4-36
151455
Supervised
Power Limited