title: ACR122L revert from card read mode
body: <p>I am working with the ACS ACR122L contactless reader and have come across the following issue.</p>
  
  <p>If send an APDU to the device to read a card then the reader goes into read mode to read a card that is presented. This is fine if a card is presented, but if a card is never presented then the device seems to hang in "Read Mode".</p>
  
  <p>When stuck in "Read Mode" I cannot send any further APDUs or open/close a connection.</p>
  
  <p>I have looked at setting the timeouts with no avail. All these do is set the amount of time the library waits for a response (blocks), before moving on. The reader state doesn't change.</p>
  
  <p>The only way I can revert to "Ready Mode" is to power cycle the device or present a card.</p>
  
  <p>Thanks in advance.</p>