Kidde VM-1 - Page 135

Chapter 7: Service and troubleshooting
P/N 3101890-EN • REV 006 • ISS 21JUN18 127
Figure 40: VM-CPU LEDs
Table 44: VM-CPU LED descriptions
LED
Normal state Descriptions
DS
9 Flashing Network data RX Class B activity
DS
10 Flashing Network data TX Class B activity
DS
11 Flashing Network data RX Class A activity
DS
12 Flashing Network data TX Class A activity
Network data and digital audio risers
LEDs DS9, DS10, DS11, and DS12 in Figure 40 above show the location and normal state of the network
communication status LEDs on the VM-CPU.
Network wiring alternates between channel A and channel B, as shown in Figure 41.
B
+-
LOOP2
2
B
H
S
A
+-
LOOP2
AB
+
-
LOOP2
B
24+
AUX
C
M
K
S
W
R
P
NETWORK
AUDIO
AUDIO AUDIO
AUDIO
OUT
IN
+ -
B B
A IN
A OUT
B IN
B OUT
+ -
+
- +
-
+ -
A B
RS-485
+-
+
-
RS-485R
X
1
A A
+
-
T
X
1
T
S
1
R
O
M
1
C
BUS BUS
C
C C
TROUBLE
ALARM
SUP
N
C
N
O
N
O
N
A
N
C
N
C
N
O
B
+ -
LOOP1
M
K
S
W
R
P
1
B
H
S
A
+
-
LOOP1
A B
+
-
LOOP1
B 24+
AUX
C
J21 J5
TB1
LOOP CIRCUIT 1
TB2
LOOP CIRCUIT 2
TB5
J9
DS10
DS9
DS12
DS11
DS2
DS1
TB4
DS10
DS9
DS12
DS11