diff --git a/Nefarius.Peripherals.SerialPort/Util.cs b/Nefarius.Peripherals.SerialPort/Util.cs
new file mode 100644
index 0000000..c0f22b0
--- /dev/null
+++ b/Nefarius.Peripherals.SerialPort/Util.cs
@@ -0,0 +1,23 @@
+using Windows.Win32.Devices.Communication;
+
+namespace Nefarius.Peripherals.SerialPort;
+
+internal static class DCBExtensions
+{
+    public static void Init(this DCB dcb, bool parity, bool outCts, bool outDsr, int dtr, bool inDsr, bool txc,
+        bool xOut,
+        bool xIn, int rts)
+    {
+        dcb.DCBlength = 28;
+        dcb._bitfield = 0x8001;
+        if (parity) dcb._bitfield |= 0x0002;
+        if (outCts) dcb._bitfield |= 0x0004;
+        if (outDsr) dcb._bitfield |= 0x0008;
+        dcb._bitfield |= (uint)((dtr & 0x0003) << 4);
+        if (inDsr) dcb._bitfield |= 0x0040;
+        if (txc) dcb._bitfield |= 0x0080;
+        if (xOut) dcb._bitfield |= 0x0100;
+        if (xIn) dcb._bitfield |= 0x0200;
+        dcb._bitfield |= (uint)((rts & 0x0003) << 12);
+    }
+}
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