Merge pull request #111 from Letitflow/python3

FIX: Ability to chose Endianness in fromRegisters function

Author: bashwork

pymodbus/payload.py

@@ -205,7 +205,7 @@ def fromRegisters(klass, registers, endian=Endian.Little):
         :returns: An initialized PayloadDecoder
         '''
         if isinstance(registers, list): # repack into flat binary
-            payload = b''.join(pack('>H', x) for x in registers)
+            payload = b''.join(pack(endian + 'H', x) for x in registers)
             return klass(payload, endian)
         raise ParameterException('Invalid collection of registers supplied')