12 SBC-554V/555 User's Manual132Open Closed Closed 2-3Open Closed Closed 2-31 2 3Setting jumpersYou configure your card to match the needs of your application bysetting jumpers. A jumper is the simplest kind of electric switch.It consists of two metal pins and a small metal clip (oftenprotected by a plastic cover) that slides over the pins to connectthem. To close a jumper you connect the pins with the clip. To"open" a jumper you remove the clip. Sometimes a jumper willhave three pins, labeled 1, 2 and 3. In this case you would connecteither pins 1 and 2 or 2 and 3.The jumper settings are schematically depicted in this manual asfollows:A pair of needle-nose pliers may be helpful when working withjumpers.If you have any doubt about the best hardware configuration foryour applications, contact your local distributor or sales repre-sentative before you make any change.Generally, you simply need a standard cable to make mostconnections.