GE Power Management
ALPS Advanced 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 interface for the
communications application. The two communications types that can be chosen are RS232 and RS485. See the descrip-
tion below for details. See Figure 3–7: BLOCK DIAGRAM OF THE COMMUNICATIONS MODULE below.
Figure 3–7: BLOCK DIAGRAM OF THE COMMUNICATIONS MODULE
E X T E R N A L C O N N E C T O R A R E A
E D G E C O N N E C T O R
E D G E C O N N E C T O R
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
T Y P E O F C O M M U N I C A T I O N S
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)