Campbell Scientific NL240 Wireless Network Link Interface - Manual (Page 34)

NL240 Wireless Network Link Interface
FIGURE 8-3. CS I/O Serial Server LoggerNet Setup
8.2.3.4 Connect
You are now ready to connect to your datalogger using the LoggerNet Connect
screen.
8.2.3.5 Serial Sensors
The NL240 configured as an RS-232 serial server as described above can be
used to communicate with a serial sensor. However, LoggerNet is not capable
of communicating with the serial sensor. You must have some other method of
communicating with the sensor.
8.2.4 TCP Serial Client
When the RS-232 port is configured as TCP Serial Client, the NL240 will
initiate and maintain a TCP socket connection to the IP address and port
number specified by the Serial Client Address and Serial Client Port
settings. Data received on the RS-232 port will be forwarded to this TCP
connection, and data received on the TCP connection will be forwarded to the
RS-232 port. This mode can be particularly useful when an RF base or serial
sensor is behind a firewall and needs to be the party responsible for initiating
the TCP socket connection to the data collection server.
The NL240 will attempt to open a connection with the remote server, and, if
the connection fails to open, the device will continue to retry at an interval of
60 seconds. If data arrives on the RS-232 port when no TCP connection exists,
the device will buffer the data (up to 1500 bytes) and immediately attempt to
open a connection to deliver the data. If the remote server closes the
connection due to error, the NL240 will make a best effort to save any data that
was in process and re-queue it to be sent on the next successfully-opened TCP
connection.
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