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GE EPM 5300 Manual de usuario Pagina 26

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CHAPTER 4: COMMUNICATION INSTALLATION
22
EPM 5000 series Advanced Power Meters GE Multilin
RS-485 Hookup Diagram (4 wire) Full Duplex: Detail View
GR+T+R-T- GR+T+R-T-
RS-485
Communications
Port
Model#
SF485DB
RS-485
Communications
Port
Model#
SF485DB
Gnd
R+
T+
R-
T-
UNICOM 2500
(Bottom View Shown)
RS-232
RS-485
T+ T-
T+T-
R-R+
R- R+
Receive Pair
Transmit Pair
Enlarged view of twisted pair segments
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.
Figure 4.6: 4-Wire RS-485 Communication Connection Installation full duplex, detail view
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
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