Good Read Led - Newland NLS-EM3096 Integration Manual

Good Read LED

The EM3096 provides a pin (LED, PIN 10) on the host interface connector that can be used by an external
driver circuit to drive an LED to indicate a Good Read status. When a good read occurs, the LED pin
produces a high level output for about 300ms, and then the signal is back to a low level. This Good Read
LED output is not strong enough to drive an LED, so an LED driver circuit is needed.
The following Good Read LED driver circuit is provided for reference.
17
LED
R1 1K
R2
10K
VDD
2N3904
Q8
R3
1k
D3
LED