void sinkPChanged(cdeP prop)
        {
            if (MyBaseEngine.GetEngineState().IsSimulated || !IsConnected)
            {
                return;
            }
            var field = MyModFieldStore.MyMirrorCache.GetEntryByFunc(s => s.PropertyName == prop.Name);

            if (field == null)
            {
                return;
            }

            var error = OpenModBus();

            if (!string.IsNullOrEmpty(error))
            {
                MyBaseThing.LastMessage = $"{DateTime.Now} - Modbus Device could not be opened: {error}";
                TheBaseAssets.MySYSLOG.WriteToLog(10000, TSM.L(eDEBUG_LEVELS.OFF) ? null : new TSM(MyBaseThing.EngineName, MyBaseThing.LastMessage, eMsgLevel.l1_Error));
                return;
            }
            try
            {
                ushort tMainOffset   = (ushort)(TheThing.GetSafePropertyNumber(MyBaseThing, "Offset") + field.SourceOffset);
                byte   tSlaveAddress = (byte)TheThing.GetSafePropertyNumber(MyBaseThing, "SlaveAddress");
                int    tReadWay      = (int)TheThing.GetSafePropertyNumber(MyBaseThing, "ConnectionType");
                switch (tReadWay)
                {
                case 1:
                    MyModMaster.WriteSingleCoil(tSlaveAddress, tMainOffset, TheCommonUtils.CBool(prop.ToString()));
                    break;

                default:
                    MyModMaster.WriteSingleRegister(tSlaveAddress, tMainOffset, TheCommonUtils.CUShort(prop.ToString()));
                    break;
                }
            }
            catch (Exception e)
            {
                MyBaseThing.LastMessage = $"{DateTime.Now} - Failure during write of modbus property: {e.Message}";
                TheBaseAssets.MySYSLOG.WriteToLog(10000, TSM.L(eDEBUG_LEVELS.OFF) ? null : new TSM(MyBaseThing.EngineName, MyBaseThing.LastMessage, eMsgLevel.l1_Error, e.ToString()));
            }
            if (!KeepOpen) // races with reader thread, but reader thread will retry/reopen so at most one data point is lost
            {
                CloseModBus();
            }
        }