main ls370 module is now drivable

the value is the current channel, when the target (=channel) is changed,
the value changes to 0, until the switching has finished, including pause time

secop_psi/ls370sim.py

@@ -32,8 +32,10 @@ class Ls370Sim(Communicator):
     ]
     OTHER_COMMANDS = [
         ('*IDN?', 'LSCI,MODEL370,370184,05302003'),
-        ('SCAN?', '3,1'),
+        ('SCAN?', '1,1'),
     ]
+    channel = [None]
+
     def earlyInit(self):
         self._data = dict(self.OTHER_COMMANDS)
         for fmt, v in self.CHANNEL_COMMANDS: