EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 5–1
EPM 9450/9650
Chapter 5: Communication Wiring
GE
Grid Solutions
Communication Wiring
This chapter provides wiring information for the EPM 9450/9650 meter’s communication
options.
5.1 Communication Overview
RS232 communication is used to connect a single EPM 9450/9650 meter with another
device, such as a computer, RTU or PLC. The link is viable for a distance of up to 50 feet
(15.2 meters) and is available only through the meter’s Port 1. You must set the selector
switch beneath the port to RS232.
RS485 communication allows multiple EPM meters to communicate with another device at
a local or remote site. The I/O modules and the EPM displays use RS485 to communicate
with the EPM meter. All RS485 links are viable for a distance of up to 4000 feet (1220
meters). Ports 1 through 4 on the EPM 9450/9650 meter are two-wire, RS485 connections
operating up to 115200 baud. To use Port 1 for RS485, set the selector switch to RS485 (the
switch is located under the port).
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