msl.equipment.connection_pyvisa module

Uses PyVISA as the backend to communicate with the equipment.

class msl.equipment.connection_pyvisa.ConnectionPyVISA(record)[source]

Bases: Connection

Uses PyVISA to establish a connection to the equipment.

The backend value must be equal to PyVISA to use this class for the communication system. This is achieved by setting the value in the Backend field for a connection record in the Connections Database to be PyVISA.

Do not instantiate this class directly. Use the connect() method to connect to the equipment.

Parameters:: record (EquipmentRecord) – A record from an Equipment-Register Database.

property resource

The PyVISA resource that is used for the connection.

This is the Resource that would have been returned if you did the following in a script:

import pyvisa
rm = pyvisa.ResourceManager()
resource = rm.open_resource('ASRL3::INSTR')

Type:: Resource

disconnect()[source]: Calls close().

static resource_manager(visa_library=None)[source]

Return the PyVISA ResourceManager.

Parameters:

visa_library (VisaLibraryBase or str, optional) –

The library to use for PyVISA. For example:

@ivi to use IVI

@ni to use NI-VISA (only supported in PyVISA <1.11)

@py to use PyVISA-py

@sim to use PyVISA-sim

If None then PyVISA_LIBRARY will be used.

Returns:

ResourceManager – The PyVISA Resource Manager.

Raises:

ValueError – If the PyVISA backend wrapper cannot be found.
OSError – If an IVI library cannot be found.

static resource_class(record)[source]

Get the PyVISA Resource class.

Parameters:: record (EquipmentRecord or ConnectionRecord) – An equipment or connection record from a Database.
Returns:: A Resource subclass – The PyVISA Resource class that can open the record.