GE EPM 5300 User Manual download pdf (Page 26)

100

CHAPTER 4: COMMUNICATION INSTALLATION

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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GE EPM 5300 User Manual Page 26

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