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

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