ib technology

7

Example c) Mifare card in field, valid READ BLOCK command received

(Read cmd (0x52) + Keycode number + Block number)

Auxiliary output and BEEP delay timing (if options are enabled)

Mifare card in field for first time, Auxiliary output enabled and BEEP delay set. Green LED

signal can be used as an interrupt signal to the host to indicate that auxiliary data will follow.

Summary of Polling rates and command timing

Three polling rates:

1) NO card and NO commands: Polling rate determined by Polling rate parameter in

RWD EEPROM (4mS to 8 seconds, default setting 260mS)

2) Card present but NO commands: 100ms polling delay between CTS pulses.

3) Command (and parameters) received: 10ms polling delay to next CTS pulse.

For lowest power consumption, the Polling rate parameter in EEPROM is typically set to a

long period (> 1 second). Auxiliary output (if enabled) occurs after Green LED signal and

before CTS.

Host communication software must be able to handle the three polling rates.

5v

0v

Polling cycle

repeats

CTS

TTL levels

9ms

100 ms polling delay

(card still present)

6ms

37ms

RWD

RX

(3ms) Command byte + parameters received

5v

0v

RWD

TX

Acknowledge byte + 16 byte block data reply

5v

0v

1

2

3

Command + parameters

received + 6mS CTS

Not to scale

20ms

17ms

5v

0v

GREEN

LED

TTL levels

Not to scale

5v

0v

AUX

OUT

Representation of Auxiliary (serial/Wiegand) data output on OP0 / OP1 pins

2mS after Green LED signal

CTS

5v

0v

BEEP delay after Aux output

(if enabled)

CTS goes LOW after Aux out/BEEP delay