Need help connecting Fingerprint Scanner - TTL (GT-511C3) over UART Serial Comms

int i = 0;

            byte[] Parameter = new byte[4];
            Parameter[0] = (byte)(i & 0x000000ff);
            Parameter[1] = (byte)((i & 0x0000ff00) >> 8);
            Parameter[2] = (byte)((i & 0x00ff0000) >> 16);
            Parameter[3] = (byte)((i & 0xff000000) >> 24);

            // SetSpeed = new byte[] { 0x55, 0xAA, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x12, 0x00, 0x13, 0x01 };
           //  Writer();

            SetSpeed = new byte[] { 0x55, 0xAA, 0x01, 0x00, Parameter[0], Parameter[1], Parameter[2], Parameter[3], 0x21, 0x00, 0x22, 0x01 };//checkenrolled
            Writer();

            SetSpeed = new byte[] { 0x55, 0xAA, 0x01, 0x00, Parameter[0], Parameter[1], Parameter[2], Parameter[3], 0x22, 0x00, 0x23, 0x01 };//enrollStart
            Writer();

can you please send command of 12 bytes for enrollstart and enrollechecked