ALx Series Linear MOSFET DC Electronic Loads

import serial
import time

# Connect to MagnaLOAD ALx Series over Serial/USB
load = serial.Serial(port='COM4', baudrate=115200, timeout=1)

# Reset & Query Instrument Identification
load.write(b'*IDN?\n')
print("Connected to:", load.readline().decode().strip())

# Initialize parameters & turn on load input
load.write(b'VOLT 0\n')
load.write(b'CURR 0\n')
load.write(b'OUTP:START\n')

# Step through current load profile (Amperes)
setpoints = [50, 100, 200, 350]
for amps in setpoints:
    print(f"Sinking Current: {amps} A")
    load.write(f'CURR {amps}\n'.encode())
    load.write(b'MEAS:VOLT?\n')
    measured_v = load.readline().decode().strip()
    print(f"Measured Input Voltage: {measured_v} V")
    time.sleep(5)

# Safe shutdown
load.write(b'OUTP:STOP\n')
load.close()

magnaLoad = serialport("COM4", 115200);
writeline(magnaLoad, "*IDN?");
disp(readline(magnaLoad));

writeline(magnaLoad, "VOLT 0");
writeline(magnaLoad, "CURR 0");
writeline(magnaLoad, "OUTP:START");

currentSetPoints = [50, 100, 200, 350];
for i = 1:length(currentSetPoints)
    writeline(magnaLoad, sprintf("CURR %d", currentSetPoints(i)));
    writeline(magnaLoad, "MEAS:VOLT?");
    v_measured = readline(magnaLoad);
    fprintf("Current: %d A, Measured Voltage: %s V\n", currentSetPoints(i), v_measured);
    pause(5);
end

writeline(magnaLoad, "OUTP:STOP");
clear magnaLoad;

#include <stdio.h>
#include <string.h>
#include <windows.h>

int main() {
    HANDLE hSerial = CreateFile("\\\\.\\COM4", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
    DCB dcbSerialParams = {0};
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    GetCommState(hSerial, &dcbSerialParams);
    dcbSerialParams.BaudRate = CBR_115200;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;
    SetCommState(hSerial, &dcbSerialParams);

    DWORD bytesWritten;
    char cmd[] = "CURR 100\nOUTP:START\n";
    WriteFile(hSerial, cmd, strlen(cmd), &bytesWritten, NULL);
    printf("Configured ALx MagnaLOAD to sink 100 A.\n");

    CloseHandle(hSerial);
    return 0;
}

using System;
using System.IO.Ports;
using System.Threading;

class Program {
    static void Main() {
        SerialPort port = new SerialPort("COM4", 115200, Parity.None, 8, StopBits.One);
        port.Open();
        
        port.WriteLine("*IDN?");
        Console.WriteLine("Instrument ID: " + port.ReadLine());

        port.WriteLine("CURR 150");
        port.WriteLine("OUTP:START");
        Thread.Sleep(5000);

        port.WriteLine("OUTP:STOP");
        port.Close();
    }
}