Configuration Serial Port Configuration
4-12
DTRWait
Note: DTRWait is not available in RS-485 mode.
Spurious characters from the attached serial device may be interpreted as a login attempt, which could cause
the port to be unavailable for network connections. To avoid this behavior, the MSS uses the Data Transmit
Ready (DTR) output line to signal an attached serial device that a connection attempt is valid.
Normally DTR will be asserted when the port is idle. The DTRWait feature keeps 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 Port [Portlist] DTRWait command. The following example enables DTRWait for the first
serial port.
Figure 4-29: Enabling DTRWait
When DTRWait is enabled, the MSS will assert DTR when a connection begins and de-assert DTR when
the connection ends.
Logouts
In addition to DSRLogouts, a 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 4-30: Logging out of the MSS
To log out a port after a specified period of inactivity, use the Change Port [Portlist] Inactive Logout
command. This command works in conjunction with Change Server Inactive Timer, which defines how
long a port must remain idle before it is automatically logged out. For example, to make the MSS log out
the first serial port after one minute of inactivity, use the following commands. The inactivity logout timer
period can be specified in seconds (s) or minutes (m). Changing 1m to 60s in the following example
produces the same results.
Figure 4-31: Enabling Timed Inactivity Logout
Preferred Port Host
A default host for a port can be defined using the Change Port [Portlist] Preferred command. The MSS
attempts to use the preferred host for connections on a specified port when no host name is specified in a
connection command.
Figure 4-32: Defining a Preferred Service
Local>> CHANGE PORT 1 DTRWAIT ENABLED
Local>> LOGOUT
Local>> CHANGE PORT 1 INACTIVE LOGOUT ENABLED
Local>> CHANGE SERVER INACTIVE TIMER 1m
Local>> CHANGE PORT 1 PREFERRED TCP 192.0.1.66
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