User Manual

4200-46001, Rev. B.00 September 25, 2003
User Manual for the Cubic Tri-Reader 2 1-3
1.4.1 RF Field Strength
The magnetic field strength is approximately 8 A/m in the center of the antenna and
falls off by the third power of the distance. The electric field strength is determined
by the voltage applied to the coil as well as the efficiency of the antenna as a
radiator. The effective applied voltage is approximately 6 Vrms, but the antenna is
fitted with a balanced shield, reducing the apparent common mode voltage to 0.
1.4.2 Modulation Types
The signals for communication between the Tri-Reader 2 and the CSC will differ
between card types. In some cases, data will be modulated onto a carrier only,
while in others a subcarrier will also be present. The modulation schemes used for
communication also differ from one card type to another as described below.
CSC Type A: Reader-to-card, ASK 100% modified miller, 106 kbit/s. Card-
to-reader, ASK - Manchester, load modulation - subcarrier
fc/16, 847.5 kHz, 106 kbit/s.
CSC Type B: Reader-to-card, ASK 10% modulation index NRZ, 106 kbit/s.
Card-to-reader, BPSK-NRZ load modulation subcarrier fc/16,
847.5 kHz, 106 kbit/s.
Type GO CARD: Reader-to-card, ASK 8% modulation index NRZ, 115.2 kbit/s.
Card-to-reader, ASK-NRZ load modulation, 115.2 kbit/s.
1.5 Tri-Reader 2 Printed Circuit Board Size
The Tri-Reader 2 consists of an 86.5 mm diameter circular digital board and an 83
mm diameter antenna board. Thickness, including components and antenna board,
is 17 mm, except for the RJ45 connector which extends 10 mm above the
components on the back of the board, giving a maximum thickness of 27 mm.