Electrical Interface
33 LRP2000 Passive Reader/Writer
Figure 30: Sinking Output LED Driver
In Figure 30, the LED and current limiting resistor are in series between the positive supply and the +OUT
terminal. The -OUT terminal is grounded. The resistor in series with the LED sets the forward current.
1.2 K provides 20 mA LED current when run from 24 VDC.
Figure 31: Output to TTL or CMOS LogicIn
In Figure 31, the output acts as an Open Collector. This provides a TTL or CMOS compatible signal when
a 1 K to 10 K pull-up to +5 Vdc (the logic supply) is used.