How can I tell whether an unmarked terminator is active or passive?
SCSI FAQIf you have an Ohm-meter of one kind or another, measure the resistance from the TERMPWR pin to an adjacent GROUND pin. Reverse the probes and take another reading. If the reading is about 30.5 Ohms, with the probes both ways, you have a passive single-ended terminator. If the reading is about 45 Ohms, with the probes both ways, you have a passive differential terminator. Active terminators should read much higher and give very different readings with the probes interchanged. See similar questions…
