gistfile1.txt

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

Console.WriteLine(Unsafe.SizeOf<Flags>()); // 50, it worked!

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct Flags
{
    public ushort frameCnt; //0-1
    public ushort progVersion;//2-3
    public byte algUM;//4
    public byte deviceNumber;//5
    public _alg_1U _alg_1U;//6-15
    public ushort OUTPUTS;//16-17
    public _statS _StatS1;//18-19
    public _statS2 _StatS2; //20-21
    public ushort nbLector; //22-23
    public ushort nbSignal; //24-25
    public byte comBlockadeT1; //26
    public byte comBlockadeT2; //27
    public _permS permS; //28-29
    public ushort permHistory; //30-31
    public ushort stopInfo; //32-33
    public _controlFlagsS _controlFlagsS; //34-35
    public ushort timerInfo; //36-37
    public ushort timerTrDiagCycle; //38-39
    public ushort sizeOfStruct; //40-41
    public ushort methanSensorValue1; //42-43
    public ushort methanSensorValue2; //44-45
    public ushort methanSensorValue3; //46-47
    public ushort methanSensorValue4; //48-49
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct _alg_1U
{
    public byte PZP1;
    public byte PZP2;
    public byte PZS;
    public byte PZZ1;
    public byte PZZ2;
    public byte PZZ3;
    public byte KB1;
    public byte KB2;
    public byte KRU;
    public byte reserved;
}
[Flags]
public enum _statS : ushort
{
    None = 0,
    SYS_AW = 1 << 0,
    SYS_BK = 1 << 1,
    SYS_READY = 1 << 2,
    SYS_WORK = 1 << 3,
    PT_WORK = 1 << 4,
    DISPATCHER_ON_LINE = 1 << 5,
    SYS_STARTING = 1 << 6,
    LEKTOR_ERROR = 1 << 7,
    SYS_BK_KSR = 1 << 8,
    SYS_READY_LEKTOR = 1 << 9,
    SYS_INIT = 1 << 10,
    KRU_WORK = 1 << 11,
    SIG_RES_DIODA = 1 << 12,
    SIG_RES_BK_KSR = 1 << 13,
    SIG_RES_WORK = 1 << 14,
    unUse16 = 1 << 15,
}

[Flags]
public enum _statS2 : ushort
{
    None = 0,
    R1 = 1 << 0,
    R2 = 1 << 1,
    SAG_DISABLED = 1 << 2,
    unUse4 = 1 << 3,
    unUse5 = 1 << 4,
    unUse6 = 1 << 5,
    unUse7 = 1 << 6,
    unUse8 = 1 << 7,
    unUse9 = 1 << 8,
    unUse10 = 1 << 9,
    unUse11 = 1 << 10,
    unUse12 = 1 << 11,
    unUse13 = 1 << 12,
    unUse14 = 1 << 13,
    unUse15 = 1 << 14,
    unUse16 = 1 << 15,
}
[Flags]
public enum _permS : ushort
{
    None = 0,
    PZP1 = 1 << 0,
    PZP2 = 1 << 1,
    PZS = 1 << 2,
    PZZ1 = 1 << 3,
    PZZ2 = 1 << 4,
    PZZ3 = 1 << 5,
    KOMBAJN1 = 1 << 6,
    KOMBAJN2 = 1 << 7,
    KRU = 1 << 8,
    PT = 1 << 9,
    unUse11 = 1 << 10,
    unUse12 = 1 << 11,
    unUse13 = 1 << 12,
    unUse14 = 1 << 13,
    unUse15 = 1 << 14,
    unUse16 = 1 << 15,
}
[Flags]
public enum _controlFlagsS : ushort
{
    None = 0,
    confSaved = 1 << 0,
    confFrameErr = 1 << 1,
    confDataErr = 1 << 2,
    passSaved = 1 << 3,
    passFrameErr = 1 << 4,
    unUse6 = 1 << 5,
    unUse7 = 1 << 6,
    unUse8 = 1 << 7,
    unUse9 = 1 << 8,
    unUse10 = 1 << 9,
    unUse11 = 1 << 10,
    unUse12 = 1 << 11,
    unUse13 = 1 << 12,
    unUse14 = 1 << 13,
    unUse15 = 1 << 14,
    unUse16 = 1 << 15,
}