public static void SendPlcCommand(string cmd) { if ((PLCUtility.port == null ? true : PLCUtility.port.PortName != PortName)) { PLCUtility.InitPort(); } if (!PLCUtility.port.IsOpen) { PLCUtility.port.Open(); } Debug.WriteLine(string.Concat("SendPLCCommand: |", cmd, "|")); PLCUtility.port.Write(cmd); }