fixed lakeshore to keep using the simple ASCII commands

src/damaris/tools/lakeshore.py

@@ -1,8 +1,6 @@
 import serial
 import re
-import operator
 import numpy as np
-from functools import reduce
 
 from .temperature import TemperatureController, register_controller
 
@@ -18,18 +16,7 @@ reply_pattern = re.compile(r"\x02..(.*)\x03.", re.DOTALL)
 # [ACK] = \x06
 # BCC = checksum
 
-standard_device = '0011'
-EOT = '\x04'
-STX = '\x02'
-ENQ = '\x05'
-ETX = '\x03'
-ACK = '\x06'
-NAK = '\x15'
-
-
-def checksum(message):
-	bcc = (reduce(operator.xor, list(map(ord,message))))
-	return chr(bcc)
+standard_device = '/dev/ttyUSB0'
 
 
 """
@@ -104,6 +91,15 @@ class Lakeshore(TemperatureController):
         else:
             return 0.0
 
+    def read_param(self, param):
+        """Read a parameter using simple ASCII commands."""
+        self.s.write(f"{param}?\n")
+        answer = self.s.readline().strip()
+        if answer and len(answer) > 1:
+            # Remove the first character (command echo) and return the value
+            return answer[1:]
+        return None
+
     def get_value(self, name):
         temp = self.read_param(name)
         if temp is None:
@@ -114,47 +110,11 @@ class Lakeshore(TemperatureController):
             except ValueError:
                 return np.nan
 
-    def send_read_param(self, param):
-        self.s.write(EOT + self.device + param + ENQ)
-
-    def read_param(self, param):
-        self.s.flushInput()
-        self.send_read_param(param)
-        answer = self.s.read(self._expect_len)
-        m = reply_pattern.search(answer)
-        if m is None:
-            # Reading _expect_len bytes was not enough...
-            answer += self.s.read(200)
-            m = reply_pattern.search(answer)
-        if m is not None:
-            self._expect_len = len(answer)
-            return m.group(1)
-        else:
-            print("received:", repr(answer))
-            return None
-
-    def write_param(self, mnemonic, data):
-        if len(mnemonic) > 2:
-            raise ValueError
-        bcc = checksum(mnemonic + data + ETX)
-        mes = EOT+self.device+STX+mnemonic+data+ETX+bcc
-        if DEBUG:
-            for i in  mes:
-                print(i,hex(ord(i)))
-        self.s.flushInput()
-        self.s.write(mes)
-        answer = self.s.read(1)
-        # print "received:", repr(answer)
-        if answer == "":
-            # raise IOError("No answer from device")
-            return None
-        return answer[-1] == ACK
-
     # TemperatureController interface implementation
 
     def get_temperature(self) -> float:
         """Read current temperature in Celsius."""
-        temp = self.get_temperature_A()
+        temp = self.read_param('KRDG')
         if temp is None:
             return 0.0
         try:
@@ -164,7 +124,7 @@ class Lakeshore(TemperatureController):
 
     def get_setpoint(self) -> float:
         """Read target setpoint temperature in Celsius."""
-        temp = self.get_set_temperature()
+        temp = self.read_param('SETP')
         if temp is None:
             return 0.0
         try:
@@ -174,7 +134,7 @@ class Lakeshore(TemperatureController):
 
     def set_setpoint(self, temperature: float) -> bool:
         """Set target temperature in Celsius."""
-        self.set_temperature(temperature)
+        self.s.write(f"SETP {temperature}\n")
         return True
 
     def close(self):