increase mercury timeout

+ set try_cnt for IPS to 0 (do no longer know why)

frappy_psi/magfield.py

@@ -120,7 +120,7 @@ class SimpleMagfield(HasStates, Drivable):
         return last
 
     def write_target(self, target):
-        self.start_machine(self.start_field_change, target=target)
+        self.start_machine(self.start_field_change, target=target, try_cnt=0)
         return target
 
     def init_progress(self, sm, value):

frappy_psi/mercury.py

@@ -63,6 +63,7 @@ fast_slow = Mapped(ON=0, OFF=1)  # maps OIs slow=ON/fast=OFF to sample_rate.slow
 
 class IO(StringIO):
     identification = [('*IDN?', r'IDN:OXFORD INSTRUMENTS:*')]
+    timeout = 5
 
 
 class MercuryChannel(HasIO):