New ERM200 PyVisa example

Author: gboedecker

Python/Thorlabs ERM2xx Extinction Ratio Meters/ERM200_PyVisa.py

@@ -0,0 +1,60 @@
+"""
+ERM200_SCPI
+Example Date of Creation: 2025-08-25
+Example Date of Last Modification on Github: 2025-08-25
+Version of Python: 3.13
+Version of the Thorlabs SDK used: -
+Tested with ERM210
+==================
+Example Description: The example shows how to use SCPI commands in Python with pyvisa
+"""
+
+import pyvisa
+import time
+
+def main():
+    rm = None
+    device = None
+    try:
+        #Opens a resource manager
+        rm = pyvisa.ResourceManager()
+        
+
+        #Opens the connection to the device. The variable instr is the handle for the device.
+        # !!! In the USB number the serial number (M01...) and PID (0x8032) needs to be changed to the one of the connected device.
+        #Check with the Windows DEvice Manager
+        instr = rm.open_resource('USB0::0x1313::0x8032::M01099532::INSTR')
+
+
+        #print the device information
+        print(instr.query("*IDN?"))
+        
+        result = instr.query("MEAS?")
+        er, phi = result.split(",")
+        print("Measured ER: ", er)
+        print("Measured Phi: ", phi)
+
+    finally:
+        #Close device in any case
+        if device is not None:
+            try:
+                device.close()
+            except Exception:
+                pass
+
+        #Close resource manager in any case
+        if rm is not None:
+            try:
+                instr.close()
+            except Exception:
+                pass
+
+        #close out session
+        rm.close()
+
+    
+    import sys
+    print(sys.version)
+
+if __name__ == "__main__":
+    main()

Python/Thorlabs ERM2xx Extinction Ratio Meters/README.md

@@ -8,3 +8,7 @@ Please note that the code connects to the first available ERM2xx device. If you
 
 lib.TLERM200_getRsrcName(erm_handle, 0, resource)
 
+### ERM200_PyVisa.py
+This sample code shows how you can control a Thorlabs ERM200, ERM210 or ERM220 extinction ratio meter in Python with SCPI commands and PyVisa.
+Use Visa drivers to run the example.
+