User's Manual

Flow Control refers to the type of signaling that is used between the
modem and the LavaPort.
If you are connecting the LavaPort to a modem or ISDN terminal
adapter, use the default setting of Hardware (RTS/CTS) flow control.
Software Flow Control (Xon/Xoff) is used only for connecting the
LavaPort to a non-modem serial device (e.g. Using a null-modem cable
to connect to another Com Port).
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Setting LavaPort Flow Control in Windows