Adaptec 1520A User Guide - Page 36
Terminating the SCSI Bus
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AHA-1510A/20A Series User's Guide Terminating the SCSI Bus A set of resistors called terminators must be either installed in or enabled on the first and last physical devices on each host adapter channel; otherwise, the devices will not operate properly. You may need to change the termination setting on some SCSI devices when you install them. In general, the procedure for terminating the SCSI bus is as follows: 1 Determine which two SCSI devices (including the host adapter) are at the two ends of the SCSI bus. Terminate these devices, if they are not already terminated. 2 Disable termination on all other devices on the SCSI bus, if it is not already disabled. Terminating SCSI Devices Most SCSI disk drives, CD-ROM drives, and other SCSI devices have a jumper or a switch close to the SCSI connector that controls SCSI termination. Other devices have resistor modules that you can physically remove or insert. Read the device documentation if you are not sure how to determine the termination setting or how to enable or disable termination. Terminating the Host Adapter The three host adapter terminators are just below the internal SCSI connector, as shown in Figure 3-1 Terminators Figure 3-1. Host Adapter Terminators 3-2 AAAAAAAAAAAAAAAAAASPCAAAAAArtuHoiAAArncAAAArtkAAAe-SAAAn1NAAApt5AAAeuD1AAAcmAAA0aAAANtAbeAAAeu:/AAAr2mAAA1:0AAA15bAAAA/1eAAA1rAAA0S8:AAA4/e4AAA90rAAA94i0eAAA1-AAAs08AAAU04AAA,2AAAsR-AAAe0AAAre0'AAAvsAAA.AAAGCAAAuAAAAAAidAAAeAAAAAAAAAEAAACAAAAAANAAAAAADAAAAAAaAAAtAAAeAAA:PAAA1aAAA1AAAg/AAAe2AAA:9AAA3/AAA9-AAA42AAAAAAAAAAAAAAAAAAAA
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