45
DB-9 connector
USB, serial, etc. port
External coupler
USB or parallel port
>>Contact station interface
Printers with a smartcard contact station are fitted with a female DB-9 connector which
is found on the back of a printer. This connector, directly connected to the contact
station inside the printer, is also connected to an external coupler to program the chip. A
sequence of commands must be sent via the printer’s interface to insert a card into the
printer then position it under the station and establish contact.
DB-9
connector pins
Smartcard contact points
1
C1 (V c.c.)
2
C2 (reset)
3
C3 (clock)
4
C4 (reserved)
5
C5 (ground)
6
C6 (Vpp)
7
C7 (I/O)
8
C8 (reserved)
9
C9 (ground when the chip is switched with the contact station)
A sequence of commands must be sent via the printer’s interface to insert a card into the printer then position it under the station and
establish contact.
>>The command sequence is as follows:
Sending the SIS sequence :
• A card is moved from the feeder to the contact station, and stops underneath it.
• The card is pushed upwards to make contact with the station.
•
The printer connects the contact station to the DB-9 connector.
• The chip is programmed via the computer’s serial interface and the external coupler.
Refer to the ExpressCard 500 Programming Guide for further details on programming smartcards.
