Campbell Scientific NL240 Wireless Network Link Interface - Manual (Page 58)

Appendix C. NL240 Settings
Wireless Networks in Area
This is a read-only field that lists the networks available in the area.
Information listed for each network is: SSID, RSSI / Signal Strength, Channel,
Security.
If the NL240 is creating an ad hoc network, wireless networks in
the area may not be displayed.
C.3 RS-232 Tab
RS-232 Configuration
This setting controls which process will be associated with the RS-232 port.
The following values are defined:
TCP Serial Server
The device will listen for an incoming TCP connection from a remote
client. The port number of the listening connection is specified in the
“RS-232 Service Port Number” setting. Data received on the TCP
connection will be forwarded to the RS-232 port, and data received on the
RS-232 port will be forwarded to this TCP connection.
TCP Serial Client
The device will maintain a TCP client connection with a remote server.
The IP address and port number of the remote server are configured in the
settings “RS-232 TCP Serial Client IP Address” and “RS-232 TCP Serial
Client Port”. 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. The device 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
up 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 device 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.
PakBus
This port uses the PakBus® protocol.
Modbus/TCP Gateway
The device will listen for incoming MODBUS/TCP connections from a
remote client. The port number of the listening connection is specified in
the “RS-232 Service Port Number” setting. The device will convert
incoming MODBUS/TCP frames to MODBUS/RTU and forward them to
the RS-232 port. The device will wait for a response from the
MODBUS/RTU device and forward the response back to the remote
MODBUS/TCP client over the established TCP connection.
Disabled
This port will not be used.
NOTE
C-8