Lantronix MSS1-T, Reference Manual

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Serial Port Configuration Configuration
4 - 8
When MSS signal checking is enabled, the MSS will check for the presence of a DSR signal
before allowing incoming connections. Remote connections to the serial port will not be
permitted unless the DSR signal is asserted. To enable DSR signal checking, use the Change
Signal Check
command.
Figure 4-20: Enabling Signal Checking
4.4.5.3 DTRwait
Spurious characters from the modem may be interpreted as a user login, which could cause the
port to be unavailable for connections. To avoid this behavior, the MSS uses the Data Transmit
Ready (DTR) output line to signal the serial device that a connection is possible or acceptable.
Normally DTR will be asserted when the port is idle, which allows modems to answer an
incoming call; many modems will not do so unless DTR is asserted. The DTRwait feature can be
used to delay the MSS from asserting DTR until the port is actually in use (whether due to a
login or a network connection). To control DTRwait, use the Change DTRwait command.
Figure 4-21: Enabling DTRwait
The MSS will assert DTR when a connection begins and de-assert DTR when the connection
ends.
4.4.5.4 DSRlogout
When a device connected to the MSS is disconnected or powered off, the DSR signal is de-
asserted. The MSS can be configured to automatically log out the port when this occurs using
the Change DSRlogout Enabled command. This prevent users from accessing other sessions by
switching terminal lines.
Figure 4-22: Enabling DSRlogout
4.4.6 Logouts
In addition to DSRlogouts, the port can be manually logged out, or it can be configured to
automatically log out when it has been inactive for a pre-determined length of time. To
manually log out of the MSS, type “Logout” at the Local prompt or press Ctrl-D.
Figure 4-23: Logging out of the MSS
To log out the port after a specified period of inactivity, use the Change Inactive Logout
command. This command works in conjunction with the Change Inactive Timer command
which defines how long a port must remain idle before it is automatically logged out.
Local>> CHANGE SIGNAL CHECK ENABLED
Local>> CHANGE DTRWAIT ENABLED
Local>> CHANGE DSRLOGOUT ENABLED
Local> LOGOUT