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CHAPTER 4: COMMUNICATION INSTALLATION
GE Multilin EPM 5000 series Advanced Power Meters 17
CHAPTER 4
COMMUNICATION INSTALLATION
4.1: RS-232C
(This section applies to the RS-232C or RS-485.)
All EPM 5300P and 5200P instruments can be equipped with RS-232C or RS-485 communication.
RS-232C communication links a single instrument with a computer or device such as an RTU or PLC. Its
capability is up to 100 feet. A standard 9-pin female serial port connector mounts on the instrument for
direct connection to a computer with a 9-pin cable.
Figure 4.1: RS-232C Communication Connection Installation
Note: To avoid ground loops, the neutral and safety ground (pin 3) should be connected together
at only one point.
4.2: RS-485
Each EPM 5300P or 5200P instrument has a unique address up to four digits long. This allows the user
to communicate with up to 10,000 instruments. Available standard baud rates are 1200, 2400, 4800, and
9600. To select the proper baud rate, apply the following rules:
The unit operates up to 9600 baud. For a smaller number of instruments over a long distance, use a
lower baud rate. Optimal recommended baud rate is 1200 baud, if noisy conditions exist.
DB-9 CONNECTOR
A DIRECT PIN-TO-PIN CABLE CAN BE USED.
NO NULL MODEM IS REQUIRED.
COMMUNICATION
CONVERTER
Model
SF-232DB3
8 9 10 11 12 13
7
6
5
4
3
2
1
20
21
22
23
24
25
26
27
28
RS-232 COMMUNICATION CONNECTION
CONNECTION FOR DB-9 FEMALE
PIN 2 - RECEIVE OF THE HOST/COMPUTER
PIN 3 - TRANSMIT OF THE HOST/COMPUTER
PIN 5 - GROUND OF THE HOST/COMPUTER
54321
98 6
7
LAPTOP
DETAIL OF DB-9
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