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E154713
5-6
5: Communication Wiring
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 5.5: Incorrect "T" and "Star" Topologies
5.5.1: Using the Unicom
2500
The Unicom 2500 provides RS485/RS232 connection, allowing a Nexus® 1500+
meter with the optional RS485 port to communicate with a PC or other RS232 serial
device. See the
Unicom 2500 Installation and Operation Manual
for additional infor-
mation.
You can order the Unicom 2500 and the recommended communica-
tion cable for it from EIG’s webstore: www.electroind.com/store.
From the
left side of the webpage, select Communication Products for the Unicom 2500 and
Cables and Accessories for the RS485 4-wire to 2-wire cable. Figure 5.6 illustrates the
Unicom 2500 connections for RS485.
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!
Summary of Contents for Shark 100T
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