/// <summary>
        /// CBUSのIOポートを操作する
        /// </summary>
        /// <param name="bits"></param>
        public void SetCBusBit(CBUSBit bits)
        {
            if (!IsOpen())
            {
                throw new InvalidOperationException("Connection is not opened yet.");
            }
            if (eeprom == null)
            {
                throw new InvalidOperationException("CBUS is not configured yet.");
            }

            // ビットマスク作成
            byte mask = 0b00000000;

            if (eeprom.Cbus0 == FT_CBUS_OPTIONS.FT_CBUS_IOMODE)
            {
                mask = 0b00010000;
                if (bits.cbus0)
                {
                    mask |= 0b0001;
                }
            }
            if (eeprom.Cbus1 == FT_CBUS_OPTIONS.FT_CBUS_IOMODE)
            {
                mask |= 0b00100000;
                if (bits.cbus1)
                {
                    mask |= 0b0010;
                }
            }
            if (eeprom.Cbus2 == FT_CBUS_OPTIONS.FT_CBUS_IOMODE)
            {
                mask |= 0b01000000;
                if (bits.cbus2)
                {
                    mask |= 0b0100;
                }
            }
            if (eeprom.Cbus3 == FT_CBUS_OPTIONS.FT_CBUS_IOMODE)
            {
                mask |= 0b10000000;
                if (bits.cbus3)
                {
                    mask |= 0b1000;
                }
            }

            // ビット操作
            ftdi.SetBitMode(mask, 0x20);
        }
        /// <summary>
        /// CBUSのIOポートを読込む
        /// </summary>
        /// <returns></returns>
        public CBUSBit GetCBusBit()
        {
            if (!IsOpen())
            {
                throw new InvalidOperationException("Connection is not opened yet.");
            }
            if (eeprom == null)
            {
                throw new InvalidOperationException("CBUS is not configured yet.");
            }

            // ビット読込み
            byte ret = 0;

            ftdi.GetPinStates(ref ret);

            // CBUSBit作成
            CBUSBit bits = new CBUSBit(false, false, false, false);

            if ((ret & 0b00000001) == 0b00000001)
            {
                bits.cbus0 = true;
            }
            if ((ret & 0b00000010) == 0b00000010)
            {
                bits.cbus1 = true;
            }
            if ((ret & 0b00000100) == 0b00000100)
            {
                bits.cbus2 = true;
            }
            if ((ret & 0b00001000) == 0b00001000)
            {
                bits.cbus3 = true;
            }

            return(bits);
        }