Added AbstractClass to clearly define the shared interface

hpib.py

@@ -4,7 +4,18 @@ import re
 import platform
 
 
-class PrologixGpibUsb():
+class PortDevice(object):
+    def command(self, hpib_address, command):
+        raise NotImplementedError
+
+    def query(self, hpib_address, queryStr, count=80):
+        raise NotImplementedError
+
+    def set_local(self, hpib_address):
+        raise NotImplementedError
+
+
+class PrologixGpibUsb(PortDevice):
     def __init__(self, port="", timeout=1, portFormat="%d", maxDeviceNum=9, verbose=False,
                  findDevices=False):
         if port == "":
@@ -80,7 +91,7 @@ class PrologixGpibUsb():
         self._returnStr = self._serialPort.readline()
         return self._returnStr[:-1]
 
-    def setLocal(self, hpib_address):
+    def set_local(self, hpib_address):
         #self._commandStr = "++addr "+str(hpib_address)+chr(10)+"loc "+str(hpib_address)+chr(10)
         #self._commandCount = self._serialPort.write(self._commandStr)
         return
@@ -89,7 +100,7 @@ class PrologixGpibUsb():
         return self._devices
 
 
-class GPIB_232_485CT_A():
+class GPIB_232_485CT_A(PortDevice):
     def __init__(self, port="/dev/ttyS0", baudrate=9600, bytesize=serial.EIGHTBITS,
                  parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, interCharTimeout=None,
                  pause=0, timeout=10):
@@ -113,7 +124,7 @@ class GPIB_232_485CT_A():
         self._returnCnt = int(self._serialPort.readline())
         return self._returnStr[:self._returnCnt-1]
 
-    def setLocal(self, hpib_address):
+    def set_local(self, hpib_address):
         self._commandStr = "loc "+str(hpib_address)+chr(13)
         self._commandCount = self._serialPort.write(self._commandStr)
 
@@ -130,7 +141,7 @@ class HpibDevice():
 
     def setLocal(self, set2Local=True):
         if set2Local:
-            self._port.setLocal(self._hpib_address)
+            self._port.set_local(self._hpib_address)
 
     def command(self, commandStr):
         self._port.command(self._hpib_address, commandStr)