ACS ACR83 PINeasy Smart Card Reader - Manual (Page 7)

ACR83 – Reference Manual [email protected]
Version 1.05 www.acs.com.hk
Page 7 of 49
4.0. Smart Card Interface
ACR83 PINeasy Smart Card Reader has a 14-key keypad and LCD display consisting of 2 rows with
16 characters dot matrix.
4.1. Smart Card Power Supply VCC (C1)
The current consumption of the inserted card must not be higher than 100 mA.
4.2. Programming Voltage VPP C6
According to ISO 7816-3, the smart card contact C6 (VPP) supplies the programming voltage to the
smart card. Since all common smart cards in the market are EEPROM-based and do not require the
provision of an external programming voltage, the contact C6 (VPP) has been implemented as a
normal control signal in the ACR83 (CCID). The electrical specifications of this contact are identical to
those of the signal RST (at contact C2).
4.3. Card Type Selection
The controlling PC always has to select the card type through the proper command sent to the ACR83
prior to activation the inserted card.
For MCU-based cards the reader allows to select the preferred protocol, T=0 or T=1. However, this
selection is only accepted and carried out by the reader through the PPS when the card inserted in
the reader supports both protocol types. Whenever an MCU-based card supports only one protocol
type, T=0 or T=1, the reader automatically uses that protocol type, regardless of the protocol type
selected by the application.
4.4. Interface for Microcontroller-based Cards
For microcontroller-based smart cards only the contacts C1 (VCC), C2 (RST), C3 (CLK), C5 (GND)
and C7 (I/O) are used. A frequency of 4 MHz is applied to the CLK signal (C3).
4.5. Card Tearing Protection
The ACR83 (CCID) provides a mechanism to protect the inserted card when it is suddenly withdrawn
while it is powered up. The power supply to the card and the signal lines between the ACR83 (CCID)
and the card are immediately deactivated when the card is being removed. As a general rule,
however, to avoid any electrical damage, a card should only be removed from the reader while it is
powered down.
Note: The ACR83 (CCID) does never, by itself, switch on the power supply to the inserted card. This
must be explicitly done by the controlling computer through the proper command sent to the reader.