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

ECS Series Emergency Communication System Installation Manual 151455

4.4.4.3 Class A Speaker Configuration

Figure 4-25 illustrates how to wire speakers to the control panel using Class A wiring.
Supervised
Power Limited
Figure 4-25 Class A Speaker Configuration
4.4.5

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-50W's, or the voice messages generated from a system microphone to the
ECS-50W's. The maximum resistance on the VBUS is 20Ω.
Connect the VBUS from the ECS-VCM to the ECS-50W's as shown in Figure 4-26 or ECS-NVCM as
shown in Figure 4-27.
ECS-VCM
VBUS Connections
3 Vrms, 5 mA max.
Supervised
Power Limited
To Next ECS-50W
15kΩ EOL
at Last panel
on the VBUS
ECS-50W
ECS-50W
Figure 4-26 VBUS Wiring with ECS-VCM
4-18