Honeywell Farenhyt ECS Series - 6: VBUS Wiring

ECS Series Manual — P/N 151455:H 2/15/2022 27
Installing the ECS-50W ECS Device Installation
Class B Speaker Configuration
Figure 4.23 illustrates how to wire speakers to the control panel using Class B supervision.
Class A Speaker Configuration
Figure 4.24 illustrates how to wire speakers to the control panel using Class A wiring.
4.4.6 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-50W, or the
voice messages generated from a system microphone to the ECS-50W. The maximum resistance on the VBUS is 20Ω.
B
A
T
T
E
R
Y
+
–
C IR C U IT 4 CIRC U IT 3 C IR C U IT 2
CIRCUIT 1
IN
IN
IN
IN+
+
+
+–
–
–
–OUT
OUT
OUT
OUT+
+
+
+–
–
–
–
AUDIO EXPANDER
supervised,
power-limited
UL-listed
15kΩ EOL
Figure 4.23 Class B Speaker Configuration
B
A
T
T
E
R
Y
+
–
CIR C U IT 4 CIRC U IT 3 CIRCU IT 2
CIRCUIT 1
IN
IN
IN
IN
+
+
+
+
–
–
–
–
OUT
OUT
OUT
OUT
+
+
+
+
–
–
–
–
AUDIO EXPANDER
supervised,
power-limited
Figure 4.24 Class A Speaker Configuration