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3 HARDWARE DESCRIPTION
The communications interface resides on plug-in modules with user selectable jumpers to configure the inter-
face for the communications application. The two communications types that can be chosen are RS232 and
RS485. See the description below for details. Figure 3–8 is the block diagram of the PC card for the communi-
cations interface.
JP4 and JP5 select the RS485 type when RS485 commmunications is selected (2 wire/4 wire)
Both jumpers installed: 2-wire type RS485
Both jumpers uninstalled: 4-wire type RS485
(Uninstalled means the jumpers installed on one post -- the outside one -- to store the jumper. There will be no
electrical connection with jumpers in this position)
EXTERNAL CONNECTOR AREA
EDGE CONNECTOR
Jumpers JP1, JP2, and JP3 are used to determine the types of communications
JP1
JP2
JP3
O P E N
2-3
O P E N
2-3
O P E N
2-3
1-2
1-2
1-2
Figure 3–7: BLOCK DIAGRAM OF THE COMMUNICATIONS MODULE
GE Power Management
TYPE OF COMMUNICATIONS
RS232
RS485
Programmable from keypad or communications (refer to Chapters 2 and 12)
LPS-D Line Protection System
3.3 PRINTED CIRCUIT BOARD MODULES
3.3.7 COMMUNICATIONS INTERFACE
3
2
1
EDGE CONNECTOR
3
3
2
1
3-
9
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