Connecting to Gentec EO Maestro by Gentec Eo in Python

Instrument Card

Touchscreen display device for power & energy measurement. Single-channel, multiple outputs (USB, Ethernet, analog).

Device Specification: here

Manufacturer card: GENTEC EO

Gentec-EO is a manufacturer of laser beam measurement technologies

• Headquarters: Canada - QC
• Yearly Revenue (millions, USD): 14
• Vendor Website: here

Connect to the Gentec EO Maestro in Python

Read our guide for turning Python scripts into Flojoy nodes.

Flojoy

PROTOCOLS > SCPI

📄 IDN

Query a device's identity through the universal *IDN? SCPI command.

📄 MEASURE VOLTAGE

Query an instrument's measured output voltage, such as a DMM or power supply.

📄 SCPI WRITE

Write a SCPI command to a connected bench-top instrument and return the result.

QCodes Community

To connect to a Gentec EO Maestro Screen Display using Qcodes Community, you can use the following Python script:

from qcodes import VisaInstrument
from qcodes.utils.helpers import create_on_off_val_mapping

class Gentec_Maestro(VisaInstrument):
    r"""
    Instrument driver for the Gentec Maestro powermeter.
    Args:
        name (str): Instrument name.
        address (str): ASRL address
        baud_rate (int): Baud rate for the connection.
    Attributes:
        model (str): Model identification.
        firmware_version (str): Firmware version.
    """

    def __init__(self, name, address, baud_rate=115200, **kwargs):
        super().__init__(name, address, **kwargs)

        # set baud rate
        self.visa_handle.baud_rate = baud_rate

        # get instrument information
        self.model, _, self.firmware_version = self._query_versions()

        # add parameters
        self.add_parameter('power',
                           get_cmd='*CVU',
                           get_parser=float,
                           label='Power',
                           unit='W')

        def wavelength_get_parser(ans):
            return int(ans[4:])
        self.add_parameter('wavelength',
                           get_cmd='*GWL',
                           set_cmd='*PWC{0:0> 5}',
                           get_parser=wavelength_get_parser,
                           label='Wavelength',
                           unit='nm')

        def zero_offset_get_parser(ans):
            return int(ans[5:])
        self.add_parameter('zero_offset_enabled',
                           get_cmd='*GZO',
                           get_parser=zero_offset_get_parser,
                           val_mapping=create_on_off_val_mapping(on_val=1, off_val=0),
                           label='Zero offset enabled')

        # print connect message
        self.connect_message()

    # get methods
    def get_idn(self):
        return {'vendor': 'Gentec', 'model': self.model, 'firmware': self.firmware_version}

    # further methods
    def clear_zero_offset(self):
        self.write('*COU')

    def set_zero_offset(self):
        self.write('*SOU')

    def _query_versions(self):
        return self.ask('*VER').split()


# Connect to the Gentec EO Maestro powermeter
maestro = Gentec_Maestro('maestro', 'ASRL1::INSTR', baud_rate=115200)

# Get the power reading
power = maestro.power()
print(f"Power: {power} W")

# Get the wavelength setting
wavelength = maestro.wavelength()
print(f"Wavelength: {wavelength} nm")

# Check if zero offset is enabled
zero_offset_enabled = maestro.zero_offset_enabled()
print(f"Zero offset enabled: {zero_offset_enabled}")

# Clear the zero offset
maestro.clear_zero_offset()

# Set the zero offset
maestro.set_zero_offset()

# Disconnect from the powermeter
maestro.close()

This script creates a Gentec_Maestro class that inherits from VisaInstrument provided by Qcodes. It initializes the instrument by setting the baud rate, querying the instrument information, and adding parameters for power, wavelength, and zero offset enabled.

To connect to the Gentec EO Maestro powermeter, you can create an instance of the Gentec_Maestro class with the appropriate name, address, and baud rate. In the example above, it connects to the instrument with the name 'maestro', address 'ASRL1::INSTR', and baud rate 115200.

You can then use the added parameters to retrieve the power reading, wavelength setting, and check if the zero offset is enabled. The clear_zero_offset and set_zero_offset methods can be used to clear or set the zero offset, respectively.

Finally, the script closes the connection to the powermeter using the close method.

Note: Make sure to replace 'ASRL1::INSTR' with the correct address of your Gentec EO Maestro powermeter.