GE Power Management
LPS-D Line Protection System
3-
9
3 HARDWARE DESCRIPTION
3.3 PRINTED CIRCUIT BOARD MODULES
3
3.3.7 COMMUNICATIONS INTERFACE
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.
Figure 3–7: BLOCK DIAGRAM OF THE COMMUNICATIONS MODULE
EXTERNAL CONNECTOR AREA
EDGE CONNECTOR
EDGE CONNECTOR
3
2
1
3
2
1
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)
Jumpers JP1, JP2, and JP3 are used to determine the types of communications
JP1
JP2
JP3
TYPE OF COMMUNICATIONS
O P E N
2-3
O P E N
R S 2 3 2
2-3
O P E N
2-3
R S 4 8 5
1-2
1-2
1-2
Programmable from keypad or communications (refer to Chapters 2 and 12)
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