The following script shows how an input register senses the state of an output register.
#!/usr/bin/python
from PyTango import *
import sys
import time
try :
ireg1 = DeviceProxy( "someHost:10000/hires/exp/ireg1")
oreg1 = DeviceProxy( "someHost:10000/hires/exp/oreg1")
print( "ireg1, value ", ireg1.Value)
oreg1.Value = 1
print( "ireg1, value ", ireg1.Value)
oreg1.Value = 0
except :
print( "Failed with exception !")
print( sys.exc_info()[0])