Todas as propriedades descritas no tópico anterior podem ser modificadas em tempo de execução usando as Strings a seguir da biblioteca IOKit:

•Default slave address: "COURIER.DefaultSlaveAddress"

•Application Timeout (ms): "COURIER.AppTimeout"

•Poll Interval (ms): "COURIER.PollTime"

•Link Retries: "COURIER.LinkRetries"

•Slave Demotion Time (s): "COURIER.DemotionTime"

•2nd Port EvtScan (s): "Courier.SecondaryPortEvtScan"

•Max Consecutive Messages per Slave (0 to disable): "COURIER.ConsecFrames"

•General Interrogation every (s): "COURIER.GeneralInterrogation"

•Broadcast Time Synchronization every (s): "COURIER.GlobalSyncTime"

•Transfer Disturbances: "COURIER.DoDisturbance"

•Directory for Comtrade Files: "COURIER.ComtradeDir"