Comtrol Rocket Port - Manual (Page 33)

RocketPort Series/RocketModem IV Driver User Guide: 2000564 Rev. A Configuring COM Port Properties - 37
Device Driver Configuration
RTS Toggle Options
This button opens the RTS Toggle Options popup, which
provides the following features:
• Override and Lock to RS-485 Toggle Mode
Use the Override and Lock to RTS Toggle Mode option to
lock the port in RTS (Request to Send) toggle mode,
then set the mode (low or high) as desired for RS-485
mode.
• RS-485 Toggle RTS Low
Use the RTS Toggle RTS Low option to toggle the RTS
output signal low during data transmission, which may
be needed for relay devices for RS-485.
If the option box is not checked, RTS is toggled high
(asserted) during data transmission for RS-485 mode.
• Defaults
Clicking the Defaults button returns all the values in
the RTS Toggle Options popup to their default state:
- Override and Lock to RTS Toggle Mode = Disabled
- RTS Toggle RTS Low = Disabled
Transmit Data
Timeout Port Close
Default = 0
This option allows you to select the length of time to wait
for data to clear the transmit buffer after a host application
has closed the port. This is typically used with serial
devices such as printers, to give the data sufficient time to
flush through the system.
Map CD to DSR
Default = Disabled
This option is used in installations where there is no
connection to the port’s DSR input.
Click this check box to cause the CD input to appear as
DSR to the host application, and to perform hardware
handshaking with CD rather than DSR.
Map 2 Stop Bits to 1
Default = Disabled
If your application is hard-coded to use two stop bits and
you receive framing errors, click this check box to map 2
stop bits to 1 bit.
Leave this check box blank to enable stop bits to pass
through unchanged.
Wait on Physical
Transmission before
Completing Write
Default = Disabled
This option forces all write packets to wait until the
transmit data has physically completed the transmission
before returning completion to the host application.
The default mode (check box not clicked) is to buffer the
data in the transmit hardware buffer, and return
completion as soon as the packet is in the buffer.
Emulate Modem
Hardware RING
Signal
Default = Disabled
Click this check box to emulate the ring indicator signal.
If this box is checked and the port receives a RING signal
(or an alternate code, as defined in the AT command set for
the modem), it sends an RI signal to the communications
application.
Block PnP search for
attached serial device
Default = Disabled
This option disables plug and play from searching for a
device attached to the serial port.
For example, data received during device discovery on a
device is assumed to be a mouse to plug and play.
Port Settings
General Tab
Description