For serially connected optical probes (which do not have PS2 pigtail power)like the UNICOM III. The correct settings would be:
In ION setup> >Serial> Settings the RTS or DTS needs to be set to "Force ON".

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Legacy KB System (APS) Data: RESL189270 V1.0, Originally authored by KBAdPM on 11/17/2007, Last Edited by KBAdPM on 11/17/2007
Related ranges: ION Setup 2.1