Doug, As you noted, the X2 outputs are open-collector. Logic "High" turns the transistor on, which will result in a collector-to-ground voltage of a few tenths of a volt. Logic "Low" turns the transistor off, resulting in the collector voltage rising to whatever the pull-up voltage is in the device being driven.
When dealing with open-collector circuits, it may be less confusing to think in terms of current levels instead of voltage levels -- Low = no current flow, High = Max current flow. 73, Ray, K9DUR http://k9dur.info _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
