Honeywell Farenhyt ECS Series - 6: VBUS Wiring

ECS Series Manual — P/N 151455:H 2/15/2022 41
Installing the ECS-125W ECS Device Installation
4.6.6 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-125W or the
voice messages generated from a system microphone to the ECS-125W. The maximum resistance on the VBUS is 20Ω.
Connect the VBUS from the ECS-VCM to the ECS-125W amplifiers as shown in Figure 4.44 or from the ECS-NVCM to the ECS-125W as
shown in Figure 4.45.
OUT
–+
IN
–+
BA+ –
SBUS
OUT
–+
IN
–+
BA+ –
SBUS
AUX
CMD2 CMD1
AUDIO
COMMON
IN
GND
VBUS IN 1
VBUS
O
U
T
1
+
+
supervised,
power-limited
Class B
ECS-VCM
ECS-125W
ECS-125W
to next
ECS-125W
15KΩ EOL
at last module
on the VBUS
Figure 4.44 VBUS Wiring for ECS-VCM
OUT
–+
IN
–+
BA+ –
SBUS
OUT
–+
IN
–+
BA+ –
SBUS
-IN+ -OUT+
-IN+ -OUT+
ECS-125W
ECS-125W
ECS-NVCM
15KΩ EOL
at last module
on the VBUS
supervised,
power-limited
Class B
Figure 4.45 VBUS Wiring for ECS-NVCM