The information found below is for the MAGTEK 21045002 MagStripe card reader.
Single Track – Track 2
2.7 to 5.5VDC at 1mA
|HIGH = 0|
|LOW = 1|
When no card is present all pins are high. When a card is present pin 5 goes low and remains that way for 140ms after the entire card has been read.
This is a work in progress. Check back soon.