User Manual Part 1

Title
22
LRP2000 Long Range Passive Reader/Writer
Figure 3-17. Sinking Output LED Driver
In Figure 3.17, 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. 1.2K will provide 20 mA LED current when run from
24 Vdc.
Figure 3-18. Output to TTL or CMOS Logic
In Figure 3.18 the output acts as an Open Collector. This will provide a
TTL or CMOS compatible signal when a 1K to 10K pull-up to +5 Vdc
(the logic supply) is used.