EMPROT Datasheet, PDF (7/17 Pages) rfsolutions.ltd – Micro RWD EM4102 Low Power Version

ib technology
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.
GREEN
LED
AUX
OUT
TTL levels
5v
0v
Not to scale
5v
0v
Representation of Auxiliary (serial/Weigand) data output on OP0 / OP1 pins
2mS after Green LED signal
CTS
BEEP delay after Aux output
(if enabled)
5v
CTS goes LOW after Aux out/BEEP delay
0v
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.
Transmitted or Received data byte, 9600 baud, 8 bit, 1 stop, No parity (104 µS per bit)
b0 b1 b2 b3 b4 b5 b6 b7 b8 b9
5v
1
0
TTL levels
0v
idle START
8 bit data
STOP idle
7