other devices on the subnet with that address. Also, set the data logger subnet mask to match
that of the NL241.
The data logger must be listening on the same TCP port that the NL241 is configured to forward
TCP traffic on (NL241 setting: TLS Proxy Forward Port). The data logger always listens on port 80
for HTTP, therefore, no TCP port configuration is necessary for using HTTP.
8.2.6.2
Device Configuration Utility
TCP encrypted communications to
the NL241
In order to use
Device Configuration Utility
TCP encrypted communications with the NL241, you
will need to load the TLS private key and TLS certificate into the NL241. This is done from the
Settings Editor > TLS tab in
Device Configuration Utility
. Once the private key and certificate are
loaded successfully, the TLS Status field should read Initialized.
To use TCP encrypted communications, select the Use IP Connection check box in
Device
Configuration Utility
. Input the NL241 IP address (or click Browse
to select it from a list of
NL241s connected to the network) and click Connect.
NOTE:
If the status of the TLS stack is Initialized, the NL241 will automatically negotiate a secure TLS
connection with
Device Configuration Utility
as long as the Use IP Connection option is
selected.
Encrypted communications is required to change the TLS Private Key and/or TLS Certificate
via TCP. The private key and certificate cannot be initialized via TCP, since the connection is
not encrypted. They must be initialized through a direct USB connection to the NL241.
When the NL241 is in bridge mode, it cannot be configured via a secure network connection,
because in bridge mode the TLS stack is not initialized. It can be configured via USB, RS-232,
or an unsecured network connection.
9. Working around firewalls
The NL241 can be used to provide a connection between
LoggerNet
and a data logger when
both are behind firewalls as shown in
(p. 38). The NL241 must be on a public IP
address and will act as a common meeting place for all PakBus communications.
NL241 Wireless Network Link Interface
37
