diff --git a/hardwaresetup.cpp b/hardwaresetup.cpp
index 5aaf945..ad2ce93 100644
--- a/hardwaresetup.cpp
+++ b/hardwaresetup.cpp
@@ -302,6 +302,7 @@ void HardwareSetup::run() {
         }
     } // end HARDWARE_VERSION 2
     else if (HARDWARE_VERSION == 3) {
+
         fd = open(PORT_PATH, O_RDONLY);
         while (this->fd < 0) {
             // wait 1 second
@@ -310,25 +311,24 @@ void HardwareSetup::run() {
             fd = open(PORT_PATH, O_RDONLY);
         }
         cout << "Port opened" << endl;
-        // port opened
 
         // prepare buffer
         struct TransStruct * received;
         uint8_t uintBuf[4 * 6];
         void * voidBuf;
 
-        // flush existing data
+        // configure among others non-canonical mode (important)
         struct termios config;
         tcgetattr(fd, &config);
         config.c_lflag = 0; // standard value is bad choosen
-
         tcsetattr(fd, TCSANOW, &config);
-        cout << "alles io" << endl;
-        ssize_t length = read(fd, uintBuf, 24);
-        if (length < 24) {
 
+        // read raw data to buffer
+        ssize_t length = read(fd, uintBuf, 24);
+
+        // flush existing data
+        if (length < 24) {
             tcflush(fd, TCIFLUSH);
-            // length = read(fd, uintBuf, 24);
         }
 
         while (!this->stop) {