communication with i800 temperature controller is cached

1 files changed, 8 insertions, 0 deletions

diff --git a/qolab/hardware/i_server/i800.py b/qolab/hardware/i_server/i800.py
index 0e83444..318be11 100644
--- a/qolab/hardware/i_server/i800.py
+++ b/qolab/hardware/i_server/i800.py
@@ -7,9 +7,14 @@ Querying of this controller is slo-o-o-w at least 0.2 second and can be longer.
 """
 
 from qolab.hardware.basic import BasicInstrument
+from cachetools import cached, TTLCache
 import socket
 
 class I800(BasicInstrument):
+    """ Newport i800 series controller, should work with similar Omega controllers """
+    TTL_MEASURED = 30   # Time To Live for device measured things, i.e. Temperature
+    TTL_SEATABLES = 600 # Time To Live for user seatables, i.e. SetPoints, Gains, etc
+
     def __init__(self, *args, host='192.168.1.200', port=1000, **kwds):
         """
         host - default hostname or IP of the controller unit (192.168.1.200) is factory default
@@ -38,6 +43,7 @@ class I800(BasicInstrument):
         return reply[5:-1] # last symbol is '\r'
 
     @BasicInstrument.tsdb_append
+    @cached(cache=TTLCache(maxsize=1, ttl=TTL_MEASURED))
     def getTemperature(self):
         command='X01'; # give decimal representation (X) of the temperature (01 address)
         return float(self.query(command))
@@ -65,12 +71,14 @@ class I800(BasicInstrument):
         return(sign*val/scale)
 
     @BasicInstrument.tsdb_append
+    @cached(cache=TTLCache(maxsize=1, ttl=TTL_SEATABLES))
     def getSetPoint1(self):
         command='R01'
         reply=self.query(command)
         return (self.setPoinStr2value(reply))
 
     @BasicInstrument.tsdb_append
+    @cached(cache=TTLCache(maxsize=1, ttl=TTL_SEATABLES))
     def getSetPoint2(self):
         command='R02'
         reply=self.query(command)