HID Hi-O iCLASS Installation Guide - Manual (Page 46)

iCLASS OEM75 Integration Guide, 3141-907, Rev. B.0
Page 46 of 49 January 2014
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Another consideration is the processing that must occur after card data is read. The timing must be
adjusted to properly process data after the read operation. Recall from the Timing from Section
6.6.3 that the Card Present Line has a dual operational capability. When the OEM75 is configured
to be operating in Normal Power Mode, the Card Present Line is active high indicating that the
OEM75 PIC processor is functioning but no card is currently recognized. When a card is recognized
the Card Present Line goes active low for a configurable period of time called the Dealy TX period.
This is the time required by a host to prepare to receive Card data. When the Card Present Line
goes high again the OEM75 sends the Card Data to the Host. After the OEM 75 sends the card
data it enters a configurable period of time in which it listens for commands from the host. After this
period of time the OEM75 returns to waiting on the presentation of a card.