ARYGON APDB1UA33N works with the revision.

src/dev_arygon.c

@@ -28,6 +28,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
   #ifdef __APPLE__
     #define SERIAL_STRING "/dev/tty.SLAB_USBtoUART"
   #else
+    // unistd.h is needed for udelay() fct.
+    #include "unistd.h"
     #define SERIAL_STRING "/dev/ttyUSB"
   #endif
 #endif
@@ -134,6 +136,12 @@ bool dev_arygon_transceive(const dev_spec ds, const byte_t* pbtTx, const uint32_
     return false;
   }
 
+  /** @note ARYGON-APDB need 20ms between sending and receiving frame. No information regarding this in ARYGON datasheet... */
+  usleep(20000);
+
+  /** @note ARYGON-APDB need 20ms more to be able to report (correctly) present tag. */
+  usleep(20000);
+
   if (!rs232_receive((serial_port)ds,abtRxBuf,&uiRxBufLen)) {
     ERR("Unable to receive data. (RX)");
     return false;

src/rs232.c

@@ -87,7 +87,6 @@ serial_port rs232_open(const char* pcPortName)
    */
   /** @todo provide this settings dynamically */
 #define DEBUG__TRY_ARYGON_APDB
-
 #ifdef DEBUG__TRY_ARYGON_APDB
   cfsetispeed(&(sp->tiNew), B115200);
   cfsetospeed(&(sp->tiNew), B115200);