SoM-250ES_User_Manual_v1.40.doc
-15-
Rev 1.4 © 2014 EMAC, Inc.
5
Appendix B:
Jumper Settings
(See SoM manual for correct Boot jumper settings)
JB1
Boot0 Source Selection
Jumper
Position
Setting
Pins 2 & 3
A
Line pulled LOW
Pins 1 & 2*
B
Line pulled HIGH
* Default setting
JB2
Boot1 Option Selection
Jumper
Position
Setting
Pins 2 & 3*
A
Line pulled LOW
Pins 1 & 2
B
Line pulled HIGH
* Default Setting
JB3
Flash Write Protect
Jumper
Position
Setting
Pins 2 & 3
A
Resident Flash Disable
Pins 1 & 2* B
Resident Flash Enable
* Default setting
JB4
RTC Battery Enable
Jumper
Position
Setting
Pins 1 & 2
ON
Enable Battery Backup
Pins 2 & 3* OFF
Disable Battery Backup
* Default setting
JB5
RS485/RS422 Select
Jumper
Position
Setting
Pins 1 & 2
485
Select RS485
Pins 2 & 3* 422
Select RS422
* Default setting
JB6
RS232/RS4xx Select
Jumper
Position
Setting
Pins 1 & 2* 232
Select RS232
Pins 2 & 3
4xx
Select either RS422 or RS485 depending on JB5
* Default setting
