[183-thorlabs-k1-crx-devices-with-different-constants] Trying out having a K10CRX base class and then inheriting K10RC1 and K10RC2 versions with only changing the MAX_VELOCITY and open call.

Author: Henri Ervasti

qmi/instruments/thorlabs/k10cr2.py

@@ -0,0 +1,53 @@
+"""Instrument driver for the Thorlabs K10CR2/M motorized rotational mount.
+
+This driver communicates with the device via a USB serial port, using the Thorlabs APT protocol. For details,
+see the document "Thorlabs APT Controllers Host-Controller Communications Protocol", issue 25 from Thorlabs.
+
+This driver has only been tested under Linux. In principle it should also work under Windows
+after creating a virtual COM port for the internal USB serial port in the instrument.
+"""
+
+import logging
+
+from qmi.core.context import QMI_Context
+from qmi.core.rpc import rpc_method
+from qmi.instruments.thorlabs.k10crx import Thorlabs_K10CRxBase
+
+# Global variable holding the logger for this module.
+_logger = logging.getLogger(__name__)
+
+
+class Thorlabs_K10CR2(Thorlabs_K10CRxBase):
+    """Instrument driver for the Thorlabs K10CR2/M motorized rotational mount."""
+
+    # Maximum velocity in degrees/second
+    MAX_VELOCITY = 10
+
+    def __init__(self, context: QMI_Context, name: str, transport: str) -> None:
+        """Initialize driver.
+
+        The motorized mount presents itself as a USB serial port.
+        The transport descriptor should refer to the serial port device,
+        e.g. "serial:/dev/ttyUSB1"
+
+        Parameters:
+            name:      Name for this instrument instance.
+            transport: Transport descriptor to access the instrument.
+        """
+        super().__init__(context, name, transport)
+
+    @rpc_method
+    def open(self) -> None:
+        try:
+            super().open()
+            # Check that this device is a K10CR2 motor.
+            # Otherwise we should not talk to it, since we don't want to send
+            # inappropriate commands to some unsupported device.
+            self._check_k10crx("2")
+
+        except Exception:
+            # Close the transport if an error occurred during initialization of the instrument.
+            self._transport.close()
+            raise
+
+        super(Thorlabs_K10CRxBase, self).open()