while (true)
            {
           string uscitedigitali = DO8.ToString() + DO7.ToString() + DO6.ToString() + DO5.ToString() + DO4.ToString() + DO3.ToString() + DO2.ToString() + DO1.ToString();
            try
            {
                hex = uscitedigitali;
                ODhex = String.Format("{0:X2}", Convert.ToInt32(hex, 2));
            }
            catch { }

            // protocollo scrittura

            protscritt = (">" + indasc + "w" + "FF" + "00" + "00" + ODhex + CheckSum(">" + indasc + "w" + "FF" + "00" + "00" + ODhex) + "!");
            }