GE EPM 5300 Instruction Manual page 26

CHAPTER 4: COMMUNICATION INSTALLATION
RS-485 Hookup Diagram (4 wire) Full Duplex: Detail View
UNICOM 2500
(Bottom View Shown)
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
22
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.
T-
R-
T+
R+
Gnd
EPM 5000 series Advanced Power Meters
RS-485
Communications
Port
Model#
SF485DB
G R+ T+ R- T-
Enlarged view of twisted pair segments
Receive Pair
Transmit Pair
RS-485
Communications
Port
Model#
SF485DB
G R+ T+ R- T-
GE Multilin