Initial commit

unilabos/devices/temperature/chiller.py

@@ -0,0 +1,67 @@
+import json
+import serial
+
+class Chiller():
+# def xuanzheng_temp_set(tempset: int):
+    # 设置目标温度
+    def __init__(self, port,rate=9600):
+        self.T_set = 24
+        self.success = True
+        self.ser = serial.Serial(
+            port=port,  
+            baudrate=rate,
+            bytesize=8,
+            parity='N',
+            stopbits=1,
+            timeout=1
+        )
+
+    def modbus_crc(self, data: bytes) -> bytes:
+        crc = 0xFFFF
+        for pos in data:
+            crc ^= pos
+            for _ in range(8):
+                if (crc & 0x0001) != 0:
+                    crc >>= 1
+                    crc ^= 0xA001
+                else:
+                    crc >>= 1
+        return crc.to_bytes(2, byteorder='little')
+
+    def build_modbus_frame(self,device_address: int, function_code: int, register_address: int, value: int) -> bytes:
+        frame = bytearray([
+            device_address,
+            function_code,
+            (register_address >> 8) & 0xFF,
+            register_address & 0xFF,
+            (value >> 8) & 0xFF,
+            value & 0xFF
+        ])
+        crc = self.modbus_crc(frame)
+        return frame + crc
+
+    def convert_temperature_to_modbus_value(self, temperature: float, decimal_points: int = 1) -> int:
+        factor = 10 ** decimal_points
+        value = int(temperature * factor)
+        return value & 0xFFFF
+
+    def set_temperature(self, command):
+        T_set = json.loads(command)['temperature']
+        self.T_set = int(T_set)
+        self.success = False
+
+        temperature_value = self.convert_temperature_to_modbus_value(self.T_set, decimal_points=1)
+        device_address = 0x01
+        function_code = 0x06  
+        register_address = 0x000B  
+        frame = self.build_modbus_frame(device_address, function_code, register_address, temperature_value)
+        self.ser.write(frame)
+        response = self.ser.read(8)
+        self.success = True
+    
+    def stop(self):
+        self.set_temperature(25)
+
+if __name__ == '__main__':
+    ch = Chiller(port='COM17')
+    ch.set_temperature(20)