diff --git a/src/uwatec_memomouse.c b/src/uwatec_memomouse.c
index 777d3d7..accf88e 100644
--- a/src/uwatec_memomouse.c
+++ b/src/uwatec_memomouse.c
@@ -125,19 +125,18 @@ uwatec_memomouse_device_open (device_t **out, const char* name)
 		return DEVICE_STATUS_IO;
 	}
 
-	serial_sleep (200);
-
-	serial_flush (device->port, SERIAL_QUEUE_BOTH);
-
-	// Clear the RTS line and set the DTR line.
-	if (serial_set_dtr (device->port, 1) == -1 ||
-		serial_set_rts (device->port, 0) == -1) {
+	// Clear the RTS and DTR lines.
+	if (serial_set_rts (device->port, 0) == -1 ||
+		serial_set_dtr (device->port, 0) == -1) {
 		WARNING ("Failed to set the DTR/RTS line.");
 		serial_close (device->port);
 		free (device);
 		return DEVICE_STATUS_IO;
 	}
 
+	// Make sure everything is in a sane state.
+	serial_flush (device->port, SERIAL_QUEUE_BOTH);
+
 	*out = (device_t*) device;
 
 	return DEVICE_STATUS_SUCCESS;
@@ -389,7 +388,7 @@ uwatec_memomouse_read_packet_inner (uwatec_memomouse_device_t *device, unsigned
 
 
 static device_status_t
-uwatec_memomouse_dump (uwatec_memomouse_device_t *device, unsigned char *data[], unsigned int *size)
+uwatec_memomouse_dump_internal (uwatec_memomouse_device_t *device, unsigned char *data[], unsigned int *size)
 {
 	// Enable progress notifications.
 	device_progress_t progress = DEVICE_PROGRESS_INITIALIZER;
@@ -491,6 +490,32 @@ uwatec_memomouse_dump (uwatec_memomouse_device_t *device, unsigned char *data[],
 }
 
 
+static device_status_t
+uwatec_memomouse_dump (uwatec_memomouse_device_t *device, unsigned char *data[], unsigned int *size)
+{
+	// Give the interface some time to notice the DTR
+	// line change from a previous transfer (if any).
+	serial_sleep (500);
+
+	// Set the DTR line.
+	if (serial_set_dtr (device->port, 1) == -1) {
+		WARNING ("Failed to set the RTS line.");
+		return DEVICE_STATUS_IO;
+	}
+
+	// Start the transfer.
+	device_status_t rc = uwatec_memomouse_dump_internal (device, data, size);
+
+	// Clear the DTR line again.
+	if (serial_set_dtr (device->port, 0) == -1) {
+		WARNING ("Failed to set the RTS line.");
+		return DEVICE_STATUS_IO;
+	}
+
+	return rc;
+}
+
+
 static device_status_t
 uwatec_memomouse_device_dump (device_t *abstract, unsigned char data[], unsigned int size, unsigned int *result)
 {