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5: Communication Installation
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Figure 5.6: Incorrect “T” and “Star” Topologies
Twisted pair, shielded (SH) cable
+
-
SH
+
-
SH
+ -
SH
Slave device 1
Slave device 2
Last Slave device N
Master device
Earth Connection, preferably at
single location
Twisted pair, shielded (SH) cable
Twisted pair, shielded (SH) cable
Twisted pair, shielded (SH) cable
+
-
SH
Twisted pair, shielded (SH) cable
Twisted pair, shielded (SH) cable
Twisted pair, shielded (SH) cable
+
-
SH
+
- SH
+
-
SH
+ -
SH
Master device
Slave device 1
Slave device 2
Slave device 3
Slave device 4
R
T
R
T
+
-
SH
Long stub results “T” connection that can cause
interference problem!
“STAR” connection can cause interference
problem!
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