diff --git a/focus_sequence_SKEL.py b/focus_sequence_SKEL.py
index d3d0477..5727d04 100755
--- a/focus_sequence_SKEL.py
+++ b/focus_sequence_SKEL.py
@@ -14,15 +14,16 @@ import numpy as np
 import subprocess as sp
 
 
-# --- FLI-hardware related (ROBOTEL variant)
-
-
+#
+#   The next functions must return 0 in the case of successfull operation and
+#   non-zero otherwise
+#
 def set_focus(foc_val):
-    pass
+    return 0
 
 
 def get_image(filename, exp_time):
-    pass
+    return 0
 
 
 if __name__ == "__main__":
diff --git a/focus_sequence_Z1000_Ixon.py b/focus_sequence_Z1000_Ixon.py
index d163158..c437f25 100755
--- a/focus_sequence_Z1000_Ixon.py
+++ b/focus_sequence_Z1000_Ixon.py
@@ -26,7 +26,7 @@ def set_focus(foc_val):
     sock.send("goto={:g}".format(foc_val))
     resp = sock.recv(20)
 
-    if resp != "OK\n":
+    if resp != "OK":
         sock.close()
         return 1