pyvisa

import os import pyvisa # For simulation or when no physical VISA library is installed, use the PyVISA-py backend # Otherwise, PyVISA will try to find a system-installed VISA library (e.g., NI-VISA) # You can also explicitly specify a backend or path: rm = pyvisa.ResourceManager('@py') # For a specific VISA library path: rm = pyvisa.ResourceManager('/path/to/visa.dll') rm = pyvisa.ResourceManager() try: # List available resources (instruments) resources = rm.list_resources() print(f"Available resources: {resources}") if not resources: print("No instruments found. Ensure your instruments are connected and the VISA backend is correctly configured (e.g., NI-VISA or PyVISA-py).") else: # Open the first available instrument, or a specific one if known # Replace 'YOUR_INSTRUMENT_ADDRESS' with an actual address from rm.list_resources() # e.g., 'GPIB0::12::INSTR', 'ASRL1::INSTR', 'USB0::0xXXXX::0xXXXX::SN::INSTR', 'TCPIP0::192.168.1.100::INSTR' # For this example, we'll try to connect to a dummy address if no real one is found # In a real scenario, you would select an actual instrument from 'resources' instrument_address = os.environ.get('PYVISA_INSTRUMENT_ADDRESS', resources[0] if resources else 'ASRL1::INSTR') # Fallback if no resources if instrument_address.startswith('ASRL') and 'ASRL1::INSTR' in resources: # Special handling for serial, often requires baud_rate # This is a placeholder; actual baud_rate must match the instrument inst = rm.open_resource(instrument_address, baud_rate=9600) inst.write_termination = '\n' inst.read_termination = '\n' else: inst = rm.open_resource(instrument_address) # Query the instrument's identification string idn = inst.query('*IDN?') print(f"Instrument ID: {idn.strip()}") # Example: Write a command and read a response # inst.write('MEAS:VOLT:DC?') # Example SCPI command # response = inst.read() # print(f"Measurement: {response.strip()}") inst.close() print("Instrument connection closed.") except pyvisa.VisaIOError as e: print(f"VISA I/O Error: {e}") print("Ensure the VISA backend is installed and configured, and the instrument address is correct.") except Exception as e: print(f"An unexpected error occurred: {e}")