2
Table 3-4
JP3: COM2 RI/+5V/+12V Selection
Setting
Function
(1-2)
+12V
(3-4)
RI (Default)
(5-6)
+5V
3.1.3 Jumper Description
Cards can be configured by setting jumpers. A jumper is a metal bridge used to
close an electric circuit. It consists of two metal pins and a small metal clip
(often protected by a plastic cover) that slides over the pins to connect them.
To close a jumper, you connect the pins with the clip. To open a jumper, you
remove the clip. Sometimes a jumper will have three pins, labeled 1, 2 and 3.
In this case you would connect either pins 1 and 2, or 2 and 3.
The jumper settings are schematically depicted in this manual as follows.
A pair of needle-nose pliers may be helpful when working with jumpers. If
you have any doubts about the best hardware configuration for your
application, contact your local distributor or sales representative before you
make any changes. Generally, you simply need a standard cable to make most
connections.
Warning!
To avoid damaging the computer, always turn off the power
supply before setting jumpers. Clear CMOS. Before turning on
the power supply, set the jumper back to 3.0 V Battery On.
