ib technology

7

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

EM4102 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 (0 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.

Note that Auxiliary outputs (and “BEEP” output) should be turned OFF if standard

RS232 command interface is being used to ensure minimum power consumption and no

additional delays occur in the polling loop.

b0

b1

b2

b3

b4

b5

b6

b7

b8

b9

5v

0v

idle

START

8 bit data

STOP idle

1

0

TTL levels

Transmitted or Received data byte, 9600 baud, 8 bit, 1 stop, No parity (104 µS per bit)

5v

0v

GREEN

LED

TTL levels

Not to scale

5v

0v

AUX

OUT

Representation of Auxiliary (serial/Weigand) 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