diff --git a/__pycache__/device_commands.cpython-312.pyc b/__pycache__/device_commands.cpython-312.pyc
index 0bf43c8..160d46c 100644
Binary files a/__pycache__/device_commands.cpython-312.pyc and b/__pycache__/device_commands.cpython-312.pyc differ
diff --git a/__pycache__/device_interaction.cpython-312.pyc b/__pycache__/device_interaction.cpython-312.pyc
index 96e7ec4..f77ecac 100644
Binary files a/__pycache__/device_interaction.cpython-312.pyc and b/__pycache__/device_interaction.cpython-312.pyc differ
diff --git a/device_interaction.py b/device_interaction.py
index dc013b4..92084c6 100644
--- a/device_interaction.py
+++ b/device_interaction.py
@@ -15,8 +15,26 @@ WAIT_AFTER_SEND = 0.15 # Wait after sending command, before requesting input (in
 
 def create_port_connection():
     prt = None
-    for port, _, _ in sorted(cmd.list_ports.comports()):
+    print()
+    ports = []
+    for port, _,_ in sorted(cmd.list_ports.comports()):
+        ports.append(port)
+
+#ONLY FOR LINUX!!!
+    have_ttyUSB = False
+    USB_ports = []
+    for port in ports:
+        if "USB" in port:
+            USB_ports.append(port)
+    if len(USB_ports):
+        ports = USB_ports
+#    print("ports:", ports)
+
+
+#    for port, _, _ in sorted(cmd.list_ports.comports()): 
+    for port in ports:
         try:
+            print("PORT:", port)
             prt = cmd.setup_port_connection(port=port, baudrate=115200, timeout_sec=1)
             cmd.open_port(prt)
             reset_port_settings(prt)
@@ -107,4 +125,4 @@ def print_data(data):
         "V   5V2: "+shorten(data['MON_5V2'])+"V   7V0: "+shorten(data['MON_7V0'])+"V.")
 
 def close_connection(prt):
-    cmd.close_port(prt)
\ No newline at end of file
+    cmd.close_port(prt)