diff --git a/apsct_lib.py b/apsct_lib.py
index 99309c6c99b0140bf4499697e2c9cc513bf45d57..9c9e22af8a560716b0f53261a6c612c53b14a60f 100644
--- a/apsct_lib.py
+++ b/apsct_lib.py
@@ -45,7 +45,12 @@ SDI = 7
 
 PLL_200M = 0x20
 PLL_160M = 0x21
-
+class ApsctClass()
+    #
+    # Toplevel class that contrains all parts of the APSCT
+    #
+    def __init__(self):
+        self.reg_address
 def Write_byte_PLL(reg_address, wr_data, ADDRESS=0x20):
     #
     # Write Byte to the ADC