Doc# E166703 5-3
5: Communicating with the Meter
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
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 an RS485 bus: connect
(+) terminals to (+) terminals; connect (-) terminals to (-) terminals.
• You may connect up to 31 devices on a single bus using RS485. Before assembling
the bus, each device must have a unique address: refer to Chapter 10 in the
Communicator EXT 4.0 and MeterManager EXT Software User Manual. You can
download this manual at:
http://www.electroind.com/dl_page_software-downloads.html
• Protect cables from sources of electrical noise.
• Avoid both “Star” and “Tee” connections (see Figure 5.5: Incorrect “T” and “Star”
Topologies, on page 5-4).
• 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:
RS485 Daisy Chain Connection, on page 5-4. You may also connect the shield to
earth-ground at one point.
• Termination Resistors (RT) may be needed on both ends for longer length transmis-
sion lines. When they are used, the value of the Termination Resistors is deter-
mined by the electrical parameters of the cable.
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