Base Class¶

All instrument drivers inherit from DeviceManager, which handles the PyVISA connection lifecycle.

DeviceManager¶

DeviceManager ¶

Base class for SCPI instrument drivers using PyVISA.

All instrument drivers inherit from this class and gain a shared PyVISA connection lifecycle (connect / disconnect) plus thin wrappers around the two most common SCPI operations: write-only commands and query-response commands.

Attributes:

Name	Type	Description
`resource_name`		VISA resource string passed at construction time, e.g. `"USB0::0x0957::0x2807::MY12345678::INSTR"`.
`instrument`		The open `pyvisa.Resource` object, or `None` when not connected.

connect ¶

connect()

Open a PyVISA session to the instrument.

Sets a 5-second timeout and "\n" read termination on the session. Prints a confirmation message on success.

Raises:

Type	Description
`VisaIOError`	If the resource cannot be opened (e.g. instrument is off, address is wrong, or no VISA driver is installed).

disconnect ¶

disconnect()

Close the PyVISA session and release the instrument handle.

Safe to call even when not connected — does nothing if self.instrument is already None.

send_command ¶

send_command(command)

Write a SCPI command to the instrument (fire-and-forget).

Parameters:

Name	Type	Description	Default
`command`		SCPI command string, e.g. `":CHAN1:DISP ON"`.	required

Raises:

Type	Description
`ConnectionError`	If the instrument session is not open.

query ¶

query(command)

Write a SCPI command and return the instrument's response.

Parameters:

Name	Type	Description	Default
`command`		SCPI query string, e.g. `"*IDN?"`.	required

Returns:

Type	Description
	The response string with leading/trailing whitespace stripped.

Raises:

Type	Description
`ConnectionError`	If the instrument session is not open.

clear_status ¶

clear_status()

Send *CLS to clear the instrument's status registers.

Clears the Standard Event Status Register (SESR), the Status Byte Register (STB), and the error queue. Typically called during initialisation before issuing other commands.

reset ¶

reset()

Send *RST followed by *CLS to restore factory defaults.

Resets all instrument settings to their power-on defaults and then clears the status registers. Use at the start of a test sequence to guarantee a known instrument state.