Startup

script/tutorial/17_DirectEpicsAccess.py

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+"""
+EPICS direct channel access.
+EPICS devices implemented are included in PShell, package ch.psi.pshell.epics.
+However direct channel access builtin functions are available.
+"""
+
+channel_name = "TESTIOC:TESTCALCOUT:Output"
+
+#reading/writing to a channel
+print (caget(channel_name))
+caput(channel_name, 0.0)
+#Put with no wait
+caput(channel_name, 0.0)
+print (caget(channel_name))
+
+#waiting for a channel valur
+cawait(channel_name, 0.0, timeout = 10.0)
+
+#If many IO it is better to keep the same CA connection
+channel = Channel(channel_name, 'd')
+for i in range(100):
+    print channel.get()
+lscan(channel, (ai2,channel), 0, 10, 0.1)
+
+#The channel class implements Readable and Writable and therefore can be used in scans
+lscan(channel, ai2, 0, 10, 0.1)
+
+#Or else we can use a Device
+import ch.psi.pshell.epics.ChannelDouble as ChannelDouble
+channel = ChannelDouble("My Channel", channel_name)
+channel.initialize()