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4–22 EPM 5300 SERIES ADVANCED POWER METERS – INSTRUCTION MANUAL
RS-485 CHAPTER 4: COMMUNICATION INSTALLATION
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.
FIGURE 4–2: 2-Wire RS-485 Communication Connection Installation half duplex
RS-485 Hookup Diagram (2 wire) Half Duplex
5300P Instruments (rear view)
(-)(+)
R
T
RS-232
RS-485
R
T
RS-485
Communications Port
Model#SF485DB
UNICOM 2500
(Bottom View Shown)
PC