GE EPM 5200 User Manual

Page 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

G R+ T+ R- T-

G R+ 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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