Advantech B+B SmartWorx LR77 v2, Configuration Manual

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3. CONFIGURATION
If you mark the
Reject new connections
check box, then the router rejects any other con-
nection attempt. This means that the router no longer supports multiple connections.
If you mark the Check TCP connection check box, the router verifies the TCP connection.
Item Description
Keepalive Time Time after which the router verifies the connection.
Keepalive Interval Length of time that the router waits on an answer.
Keepalive Probes Number of tests that the router performs.
Table 64: Expansion Port Configuration 2
When you mark the Use CD as indicator of the TCP connection check box, the router uses
the carrier detection (CD) signal to verify the status of the TCP connection. The CD signal
verifies that another device is connected to the other side of the cable.
CD Description
Active TCP connection is enabled
Nonactive TCP connection is disabled
Table 65: CD Signal Description
When you mark the Use DTR as control of TCP connection check box, the router uses the
data terminal ready (DTR) single to control the TCP connection. The remote device sends a
DTR single to the router indicating that the remote device is ready for communications.
DTR Description server Description client
Active The router allows the establishment of
TCP connections. The router initiates a TCP connec-
tion.
Nonactive The router denies the establishment of
TCP connections. The router terminates the TCP con-
nection.
Table 66: DTR Signal Description
Since firmware 3.0.9, all v2 routers provide a program called getty which allows user to connect
to the router via the serial line (router must be fitted with an expansion port RS232!). Getty
displays the prompt and after entering the username passes it on
login program, which asks
for a password, verifies it and runs the shell. After logging in, it is possible to manage the
system as well as a user is connected via telnet.
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