||How to access 4 ACR30U Smart Card Readers in a PC? Where I can get the API?
||You can control up to four smart card readers with the attached include file and DLL. This version should be used for controlling up to four smart card readers. Please use the attached
DLL. It can support up to 4 USB readers at a time.
#define AC_USB1 15
#define AC_USB2 30
#define AC_USB3 31
#define AC_USB4 32
To open the 2nd reader, use AC_USB2 as your 2nd parameter to AC_Open. Then use that handle to power up or send APDU commands to that reader.
4 USB Reader Support