diff --git a/mcdp/src/ch/ntb/mcdp/bdi/MPC555.java b/mcdp/src/ch/ntb/mcdp/bdi/MPC555.java
index 37d4b58..0f38eed 100644
--- a/mcdp/src/ch/ntb/mcdp/bdi/MPC555.java
+++ b/mcdp/src/ch/ntb/mcdp/bdi/MPC555.java
@@ -464,6 +464,8 @@ public class MPC555 {
 		// update the value (now the device should be connected)
 		if (maxNofWordsFastDownload <= 0) {
 			maxNofWordsFastDownload = ((device.getMaxPacketSize() - DataPacket.PACKET_MIN_LENGTH) / BDI_DATA35_LENGTH);
+			logger.finer("update maxNofWordsFastDownload: "
+					+ maxNofWordsFastDownload);
 		}
 		// check if data fits into USB-packet
 		if (dataLength > maxNofWordsFastDownload) {