make dacs file a parameter

src/tempus/Tempus.py

@@ -233,7 +233,7 @@ class Tempus(Device):
             # os.system(f'{self.CFG_DIR}/B3_timing_dacs.py') cannot be used,
             # as the script accesses the mytpx4 instance
             await self.send_command(
-                f"exec(open('{self.CFG_DIR}/B3_timing_dacs.py').read())")
+                f"exec(open('{self.CFG_DIR}/{self.dacsFile.value}').read())")
             await self.send_command(
                 f"mytpx4.setDAC('DAC_Vthreshold', {self.vthreshold.value})")
             await self.send_command(
@@ -338,6 +338,15 @@ class Tempus(Device):
         defaultValue=100,
         allowedStates={State.INIT, State.ON})
 
+    @String(
+        displayedName="DACS py File",
+        defaultValue="B3_timing_dacs.py",
+        allowedStates={State.INIT, State.ON})
+    async def dacsFile(self, value):
+        self.dacsFile = value
+        # if self.state not in (State.UNKNOWN, State.ERROR):
+        #     self.state = State.INIT  # force re-initialization
+
     @String(
         displayedName="Equalisation npy File",
         defaultValue="B3_equalisation_HV100.npy",