User's Manual
GuardianManual001‐5006‐000Rev0 30|Page
DTREnable
UsedtoassertDTR(DataTerminalReady)lineoftheRS232PortwhentheportisopenforthePrimaryand
SecondaryCOMPorts.
SwapCOMPorts
SelectingtheSwapComPortsbuttonmovestheSecondaryCOMPortsettingstothePrimaryCOMPort(and
movesthePrimary
COMPorttotheSecondarysettings).SinceGuardianprogrammingisdonethroughthePrimary
COMPort,thisisusefulwhentwounitsareconnectedtothePrimaryandSecondaryCOMPorts.ASwapCOM
Portsallowsthesecondunittobeprogrammedwithoutswitchingprogrammingcables.
5.1.2.1 PRIMARYANDSECONDARYPORTSETTINGSCOMMUNICATIONSMODES
TheModedropdownmenuconfiguresthecommunicationsmodeforthePrimaryandSecondaryPCPort.See
Table2‐6forCommunicationModesconfigurations.
Table5.1‐CommunicationModes
Mode Description
Sync/ESCwithNoHS SendsdatausingSync/byte‐stuffingprotocolwithouthandshaking.
BufferedwithNoHS Sendsbuffereddatawithouthandshaking(thismoderequiredforDOX
operation.)
Sync/EscwithRTS/CTSHS SendsdatausingtheSync/Escbyte‐stuffingprotocolwithRTS/CTShardware
handshaking.
BufferedwithRTS/CTSHS SendsbuffereddatawithRTS/CTShardwarehandshaking.
Sync/EscwithFlowControlHS SendsdatausingtheSync/Escbyte‐stuffingprotocolwithflowcontrol
handshaking.
BufferedwithFlowControlHS Sendsbuffereddatawithflowcontrolhardwarehandshaking.