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CHAPTER 4: COMMUNICATION INSTALLATION
GE Multilin EPM 5000 series Advanced Power Meters 21
RS-485 Hookup Diagram (4 wire) Full Duplex
T+ T-R-R+
PC
UNICOM 2500
(Bottom View Shown)
RS-232
RS-485
Note: This does not
represent a twisted pair. It
shows the cross-over from R
to T between the Unicom
and the rest of the bus.
5300P Instruments (rear view)
RS-485
Communications Port
Model#SF485DB
Figure 4.5: 4-Wire RS-485 Communication Connection Installation full duplex
—Detail view on following page
Connecting 4-Wire bus to RS-485 Port:
• Connect the T- wire of the Unicom 2500 to the R- on the RS-485 port
• Connect the R- wire of the Unicom 2500 to the T- on the RS-485 port
• Connect the T+ wire of the Unicom 2500 to the R+ on the RS-485 port
• Connect the R+ wire of the Unicom 2500 to the T+ on the RS-485 port