CHAPTER 4: COMMUNICATION INSTALLATION

RS-485 Hookup Diagram (4 wire) Full Duplex: Detail View

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.

T-

R-

T+

R+

Gnd

RS-485

Communications

Port

Model#

SF485DB

G R+ T+ R- T-

RS-485

Communications

Port

Model#

SF485DB

G R+ T+ R- T-

Enlarged view of twisted pair segments

UNICOM 2500

(Bottom View Shown)

 

Receive Pair

R-

R-

R+

R+

 

Transmit Pair

T-

T-

T+

T+

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

EPM 5000 series Advanced Power Meters

GE Multilin

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GE EPM 5350, EPM 5200, EPM 5300 instruction manual RS-485 Hookup Diagram 4 wire Full Duplex Detail View, Bottom View Shown