2-Wire Rs485 Connection - Electro Industries Shark 200 Installation & Operation Manual

Figure 5.3 shows the detail of a 2-wire RS485 connection
From other RS485 device
Connect :
•
(−) to (−)
•
(+) to (+)
•
Shield(SH) to Shield(SH)
NOTES:
For All RS485 Connections:
• Use a shielded twisted pair cable and ground the shield, preferably at one location
only.
• Establish point-to-point configurations for each device on a RS485 bus: connect (+)
terminals to (+) terminals; connect (-) terminals to (-) terminals.
• You may connect up to 31 meters on a single bus using RS485. Before assembling
the bus, each meter must have a unique address: refer to Chapter 8 in the
Communicator EXT
tions.
• Protect cables from sources of electrical noise.
• Avoid both "Star" and "Tee" connections (see Figure 5.5).
• No more than two cables should be connected at any one point on an RS485 net-
work, whether the connections are for devices, converters, or terminal strips.
• Include all segments when calculating the total cable length of a network. If you are
not using an RS485 repeater, the maximum length for cable connecting all devices
is 4000 feet (1219.20 meters).
• Connect shield to RS485 Master and individual devices as shown in Figure 5.4. You
may also connect the shield to earth-ground at one point.
Electro Industries/GaugeTech
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
The Leader In Power Monitoring and Smart Grid Solutions
-
+
SH
Figure 5.3: 2-wire RS485 Connection
TM
4.0 and MeterManager EXT Software User Manual for instruc-
Doc
5: Communication Installation
Shark meter RS485 connections
%THD
-
PRG
120%-
+
SH
#
E149701
MAX MENU ENTER
VOLTS L-N
MIN VOLTS L-N
120 0
LM1 AMPS
.
LM2
A W/VAR/PF
VA/Hz
Wh
120 0
. VARh
B
VAh
120 0
.
C
90%-
60%-
Wh Pulse
30%-
KILO
MEGA
%LOAD
5-3