B&B Electronics USR604 - Manual - Manual (Page 29)

Section 6 - Advanced User Settings
Page 29 of 45 Document Number: USR60x-0812m
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Event On Surprise Removal - The Event On Surprise Removal option
is generally left unselected.
Set RTS On Close - Selecting the Set RTS On Close option will set the
RTS signal on closing the port.
Disable Modem Ctrl At Startup - This option is used to control the
modem control signals DTR and RTS at startup. Devices that monitor
these signals can enter the wrong state after an unplug-replug cycle on
USB.