ID Tech Spectrum IIa User Manual page 11

SW (CARD SEATED SIGNAL Pin 10) : Its normal level is HIGH. When the card is fully inserted
(seated), the SW signal goes LOW to indicate that all eight contacts on the reader are in full
connection with the IC contacts on the smart card. This signal is used to tell the host that the ICC
is fully inserted and power can be applied to the smart card contacts. When the card is withdrawn
(that is, when the card is moved from the fully-seated position) the SW goes back to HIGH, which
indicates the card has moved from the seated position and is about to be disconnected from the
smart card contacts.
The following timing is guaranteed: the SW goes LOW after all eight contacts on the reader are in
full connection with the IC contacts on the smart card. SW goes HIGH before the card is moved
from the fully-seated position. The SW can be used by the processor to guarantee that power is
applied to the smart card only when all eight contacts on the card are fi rmly connected with the
contacts on the reader.
CP (CARD PRESENT SWITCH SIGNAL PIN 9): Its normal level is HIGH. A card-sensing switch
furnishes output to the host via connector pin 9. The CARD PRESENT switch is activated when a
card is inserted into the front portion of the insert reader.
LC (LATCH CONTROL SIGNAL Pin 12) and CL (CARD LATCHED SIGNAL Pin 18): When the
signal LATCH CONTROL (Pin 12) is taken HIGH, the latch is engaged. When it is taken LOW, the
latch is disengaged. The signal CARD LATCHED (Pin 18) goes LOW when the latch mechanism
is engaged. To ensure full latching and unlatching, the host terminal should wait a minimum of
500ms between "latch" and "unlatch" levels on the LATCH CONTROL signal input. (This allows
the motor control circuits to properly reset after each motor operation.)
M READ ENABLE (PIN 20): Normally HIGH signal. The host pulls this signal LOW to apply
power to the magnetic circuit. A jumper can be added to have power applied at all times, this
option must be specifi ed at the time the unit is ordered.
RST, CLK, I/O, C1, C4, VCC, VPP, GND (ICC SIGNALS PINS 1-8): Please refer to ISO 7816 for
the signal defi nition. The connector is ISO 7816 and EMV-compliant.
CHASSIS GROUND (PIN 17) is internally connected to signal ground by a jumper.
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