HID Hi-O iCLASS Installation Guide - Manual (Page 44)

iCLASS OEM75 Integration Guide, 3141-907, Rev. B.0
Page 44 of 49 January 2014
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6.8.7 Timing
There are two parameters that are configurable, see Figure 6-2 – Timing. In Ultra-Low Power Mode
the Card Present Signal is initially low as microprocessor power has been turned off. When a Card
is detected by the pinger circuit, the pinger applies power to the microprocessor. The
microprocessor executes its initialization routines and configures the processor ports. At this time
the Card Present signal transitions from low to high, the microprocessor reads the card data. When
the card data has been processed the microprocessor signals this event by transitioning the Card
Present signal from high to low and then from low to high. The microprocessor then presents the
data to the host during the “Data Out” period of time indicated in the figure. After the data has been
sent to the host the microprocessor enters a state in which it will accept commands from the host.
After this time the microprocessor shuts down at which point the Card Present signal will go low and
remain low until another card is recognized.
Delay TX indicates the delay after a card is read (2mS increments) before the data is transmitted.
The start of this timing window is indicated by the Card Present line. Note that the figure does not
represent the entire time activity of the Card Present signal. The Card Present signal will be low
prior to the indicated activity as the main microprocessor is powered off.
Receive Cmds indicates the delay after the data is sent before the unit shuts down to the ultra-low
power mode (500mS increments). During this time the reader accepts commands (assuming it is
configured in the appropriate operation mode) from a host. Each time a command is received, the
timer is reset. Bypass the timer by sending a sleep command.
Figure 6-2: Timing