diff --git a/software/control/celesta.py b/software/control/celesta.py
index 91e184ce..459a84b2 100755
--- a/software/control/celesta.py
+++ b/software/control/celesta.py
@@ -3,12 +3,14 @@
 Bogdan 3/19
 
 revised HL 2/2024
+
+You Yan 12/2024
 """
 
 import urllib.request
 import traceback
 from squid.abc import LightSource
-from control.lighting import LightSourceType, IntensityControlMode, ShutterControlMode
+from control.lighting import ShutterControlMode
 
 import squid.logging
 
@@ -49,7 +51,7 @@ def __init__(self, **kwds):
         except:
             log.error(traceback.format_exc())
             self.live = False
-            log.error("Failed to connect to Lumencor Laser at ip:", ip)
+            log.error("Failed to connect to Lumencor Laser at ip: 192.168.201.200")
 
         if self.live:
             [self.pmin, self.pmax] = self.get_intensity_range()
@@ -101,6 +103,9 @@ def get_IP(self):
         return self.message
 
     def get_shutter_control_mode(self):
+        """
+        Return True/False the lasers can be controlled with TTL.
+        """
         self.message = lumencor_httpcommand(command="GET TTLENABLE", ip=self.ip)
         response = self.message["message"]
         if response[-1] == "1":
@@ -109,6 +114,9 @@ def get_shutter_control_mode(self):
             return ShutterControlMode.Software
 
     def set_shutter_control_mode(self, mode):
+        """
+        Turn on/off external TTL control mode.
+        """
         if mode == ShutterControlMode.TTL:
             ttl_enable = "1"
         else:
@@ -116,12 +124,18 @@ def set_shutter_control_mode(self, mode):
         self.message = lumencor_httpcommand(command="SET TTLENABLE " + ttl_enable, ip=self.ip)
 
     def get_shutter_state(self, laser_id):
+        """
+        Return True/False the laser is on/off.
+        """
         self.message = lumencor_httpcommand(command="GET CH " + str(laser_id), ip=self.ip)
         response = self.message["message"]
         self.on = response[-1] == "1"
         return self.on
 
     def get_intensity_range(self):
+        """
+        Return [minimum power, maximum power].
+        """
         max_int = 1000  # default
         self.message = lumencor_httpcommand(command="GET MAXINT", ip=self.ip)
         if self.message["message"][0] == "A":
@@ -129,24 +143,30 @@ def get_intensity_range(self):
         return [0, max_int]
 
     def get_intensity(self, laser_id):
+        """
+        Return the current laser power.
+        """
         self.message = lumencor_httpcommand(command="GET CHINT " + str(laser_id), ip=self.ip)
-        log.debug(command="GET CHINT " + str(laser_id), ip=self.ip)
+        log.debug("command = 'GET CHINT " + str(laser_id) + "'")
         response = self.message["message"]
         power = float(response.split(" ")[-1])
         intensity = power / self.pmax * 100
         return intensity
 
     def set_shutter_state(self, laser_id, on):
+        """
+        Turn the laser on/off.
+        """
         if on:
             self.message = lumencor_httpcommand(command="SET CH " + str(laser_id) + " 1", ip=self.ip)
             self.on = True
         else:
             self.message = lumencor_httpcommand(command="SET CH " + str(laser_id) + " 0", ip=self.ip)
             self.on = False
-        log.info("Turning On/Off", self.on, self.message)
+        log.debug(f"Turning On/Off {self.on} {self.message}")
 
     def set_intensity(self, laser_id, intensity):
-        log.info("Setting intensity to ", intensity)
+        log.debug(f"Setting intensity to {intensity}")
         power_in_mw = self.pmax * intensity / 100
         self.message = lumencor_httpcommand(
             command="SET CHINT " + str(laser_id) + " " + str(int(power_in_mw)), ip=self.ip
@@ -156,12 +176,18 @@ def set_intensity(self, laser_id, intensity):
         return False
 
     def shut_down(self):
+        """
+        Turn the laser off.
+        """
         if self.live:
             for i in range(self.n_lasers):
                 self.set_intensity(i, 0)
                 self.set_shutter_state(i, False)
 
     def get_status(self):
+        """
+        Get the status
+        """
         return self.live