GE Grid Solutions Multilin 9450 - Page 64

5–4 EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL
COMMUNICATION OVERVIEW CHAPTER 5: COMMUNICATION WIRING
Figure 5-3: Communication Wiring
Note
• I/O Modules and External Displays require power connections to the +/- Voltage
terminals (dashed lines).
• For all communications: S = Shield. This connection is used to reference the EPM
9450/9650 meter’s port to the same potential as the source. It is not an earth-
ground connection. You must also connect the shield to earth-ground at one
point.
• You can use ANY port to connect an EPM display or RS485 Master. The I/O modules
use Port 3 or Port 4. EPM P40N
PLUS
or P60N displays are shipped pre-programmed
to use Port 3.
RS232
Extension
Cable
1:1 Wiring
RT=
~120 Ohms
RT=
RT=
RT=
RT=
RT=
~120 Ohms
~120 Ohms
120 Ohms
~120 Ohms
~120 Ohms
+V- S - +
+V- S - +
+V- S - +
+V- S - +
8 7 6 5 4 3 2 1 0 - +
- -
+ - S -V+
+ + G
+ - S -V+
23-ASTER
5NICOMOR
-ODEM-ANAGER
0.
%XTERNAL$ISPLAY
)/-ODULE
24
^/HMS
24
^/HMS
24
^/HMS
24
^/HMS
24
^/HMS
24
^/HMS
23
%XTENSION
#ABLE
7IRING
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0ORT
2323
3ELECTABLE
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