167
Serial Port Profiles
DTR Signal Acts as
RI Specify this option to make the DTR signal always act as a RI signal.
Default: Disabled
RTS Signal Always
On Specify this option to make the RTS signal always act as a RTS signal.
Default: Enabled
RTS Signal Acts as
DCD Specify this option to make the RTS signal always act as a DCD signal.
Default: Disabled
RTS Signal Acts as
RI Specify this option to make the RTS signal always act as a RI signal.
Default: Disabled
DCD Signal Always
On When you configure the DTR or RTS signal pin to act as a DCD signal, enable
this option to make the DCD signal alway s stay on.
Default: Enabled
DCD Signal On
when host
connection
established
When you configure the DTR or RTS signal pin to act as a DCD signal, enable
this option to make the DCD signal activ e only during active communicat ion .
Default: Disabled
Additional modem
initialization You can specify additional virtual modem commands that will affect how
virtual modem starts. The following comm ands are supported: ATQn, ATVn,
ATEn, +++ATH, ATA, ATI0, ATI3, ATS0, AT&Z1, AT&Sn, AT&Rn,
AT&Cn, AT&F, ATS2, ATS12, ATO (ATD with no phone number), and
ATDS1.
See Appendix C, Virtual Modem AT Commands on page 361 for a more
detailed explanation of the support initialization commands.
Enable Message of
the Day (MOTD) When enabled, displays the Message of the Day (MOTD) when a successful
virtual modem connection is made.
Default: Disabled
Enable TCP
Keepalive Enables a per-connection TCP keepalive feature. After the configured number
of seconds, the connection will send a gratuitous ACK to the network peer,
thus either ensuring the connection stays active OR causing a dropped
connection condition to be recogni zed.
This parameter needs to be used in conjunction with Monitor Connection
Status Interval parameter found in the Serial, Advanced, Advanced Settings
tab. The interval specifies the inactivity period before "testing" the connection.
Default: Disabled
AT Command
Response Delay The amount of time, in milliseconds, before an AT response is sent to the
requesting device.
Default: 250 ms