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175

Serial Port Profiles

Additional modem

initialization

You can specify additional virtual modem commands that will affect how

virtual modem starts. The following commands 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 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 recognized.

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

Session Strings Controls the sending of ASCII strings to serial devices at session start as

follows;

z Send at Start—If configured, this string will be sent to the serial device

on power-up of the IOLAN or when a kill line command is issued on this

serial port. If the "monitor DSR" or "monitor DCD" options are set, the

string will also be sent when the monitored signal is raised.

Range: 0-127 alpha-numeric characters

Range: hex 0-FF

z Delay after Send—If configured, will inset a delay after the string is sent

to the device. This delay can be used to provide the serial device with time

to process the string before the session is initiated or terminated.

Default: 10 ms

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