Tunnel Master® wbc Installation Guide
Page 44
Tunnel Master® wbc Installation Guide
Page 44
RS-485 Communication Wiring Layout
You can wire up to a maximum of four smart relay boards. Connectors are interchangeable on all boards
even though there are two separate ports, either one can be used. In Figure 38, you can see the sample
layout for a Tunnel Master® wbc system with the double Tunnel Master Jr. configuration with 144 outputs.
Figure 39. RS-485 Communication Wiring Layout
485 UPPER TIER COM
PORT
ICS SUPPLIED 24/4
COMM CABLE
INSTALLATION NOTE:
Attach the drain shield at each end
of the COMM cable to the ground
lug of each enclosure. Shield ground
needs to be tied to the ground at
one end only.
WARNING
: Do not connect both
ends of the shield ground to
different ground points.
BL
K
(Y
) D
at
a +
RS-485 Communication Cable Layout
for a Tunnel Master wbc System
with a Double Junior Configuration
96 + 24 + 24 =144 Outputs
TX
-
TX
+
RX
+
RX
-
G
ND
485 LOWER TIER COM
PORT
TX
-
TX
+
RX
+
RX
-
G
ND
96 Outputs
Tunnel Master wbc
485 UPPER TIER COM
PORT
TX
-
TX
+
RX
+
RX
-
G
ND
Tunnel Master Jr. 2
nd
Relay Box
Additional 24 Outputs
BL
K
W
HT
SHIELD
DRAIN
SHIELD
DRAIN
W
HT
BL
K
BL
K/
W
H
T
SHIELD
DRAIN
ICS SUPPLIED 24/4
COMM CABLE
W
HT
BL
K
BL
K/
W
H
T
Tunnel Master wbc
Controller
Keypad
Tunnel Master Jr.
1
st
Relay Box
Additional 24 Outputs
485 LOWER TIER COM
PORT
TX
-
TX
+
RX
+
RX
-
G
ND
TX
-
TX
+
RX
+
RX
-
G
ND
TX
-
TX
+
RX
+
RX
-
G
ND
SHIELD
DRAIN
W
HT
BL
K
BL
K/
W
H
T
SHIELD
DRAIN
W
HT
BL
K
BL
K/
W
H
T
485 UPPER TIER COM
PORT
485 LOWER TIER COM
PORT
Ultrasonic Truck Bed Sensor
Converter Box
DT
-
G
ND
SHIELD
DRAIN
DT
+
DT
-
G
ND
DT
+
BL
K/
W
H
T
W
HT
ICS SUPPLIED 24/4
COMM CABLE
SHIELD
DRAIN
BL
K/
W
H
T
W
HT
W
HT
(G
) Da
ta
-
ICS SUPPLIED 24/4
COMM CABLE
