Skip to content
Flojoy Docs

SCPI_WRITE

Download Flojoy Studio to try this app
Write a SCPI command to a connected bench-top instrument and return the result. Inputs ------ default: DataContainer Any DataContainer - likely connected to the output of the OPEN_SERIAL block. Params: connection : Serial The open serial connection with the instrument. Returns: out : Scalar|String The return value from the bench-top instrument as a Scalar or String.
Python Code
from typing import Optional, cast

import serial
from flojoy import DataContainer, Scalar, SerialConnection, String, flojoy


@flojoy(deps={"pyserial": "3.5"}, inject_connection=True)
def SCPI_WRITE(
    connection: SerialConnection,
    default: Optional[DataContainer] = None,
    command: str = "*IDN?",
) -> Scalar | String:
    """Write a SCPI command to a connected bench-top instrument and return the result.

    Inputs
    ------
    default: DataContainer
        Any DataContainer - likely connected to the output of the OPEN_SERIAL block.

    Parameters
    ----------
    connection: Serial
        The open serial connection with the instrument.

    Returns
    -------
    Scalar|String
        The return value from the bench-top instrument as a Scalar or String.
    """

    # Start serial communication with the instrument
    set = cast(serial.Serial, connection.get_handle())

    if set is None:
        raise ValueError("Serial communication is not open")

    CMD = command + "\n\r"

    set.write(CMD.encode())

    resp = set.readline().decode()

    try:
        resp = float(resp.rstrip("\n"))
    except Exception:
        return String(resp)

    return Scalar(resp)

Find this Flojoy Block on GitHub

Videos

Control Agilent 34410A multimeter with Flojoy

Example App

Having problems with this example app? Join our Discord community and we will help you out!
React Flow mini map

This app queries sends a SCPI string command to a connected benchtop instrument. Write the SCPI command in the parameter field of the SCPI_WRITE node.