User Manual

Application Note 25 – Using the Model 6055B HID Mifare Reader Page 8
In transaction mode, every function of the reader is under the complete control of
the connected PC or controller.
The reader will assert the DTR control line when it successfully reads a card.
This alerts the host that a card has been read, and can be used to trigger the
customer’s application program. The reader continuously re-transmits the CSN
until an acknowledgement is received from the host. The reader also sends a
“break” signal when it powers up. If the developer is using non-standard keys for
his application, this allows the application to resend the keys (only the default
keys are stored in Flash memory).