Campbell Scientific NL200/NL201 Network Link Interface - Manual (Page 51)

Appendix C. NL200/201 Settings
RS-232 TCP Serial Client Port
This setting specifies the TCP port of the outgoing TCP Serial Client
connection. (range 1..65535)
C.3 CS I/O Tab
CS I/O Configuration
This setting controls which process will be associated with the CS I/O 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 “CS
I/O Service Port Number” setting. Data received on the TCP connection
will be forwarded to the CS I/O port, and data received on the CS I/O port
will be forwarded to this 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 “CS I/O Service Port Number” setting. The device will convert
incoming MODBUS/TCP frames to MODBUS/RTU and forward them to
the CS I/O 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.
CS I/O Service Port Number
To communicate with a TCP/IP server, the client application must open a
socket to that server. The socket of a specific server is uniquely identified by
an IP address of the host where the server is running and a port number
associated with the server application on that host. This entry is where the port
number of the serial server is set. Typically, it is not necessary to change this
entry from its default. (range 1..65535)
SDC Address
Communication with the datalogger via the CS I/O port is done using SDC
(Synchronous Device Comms). The datalogger will address the devices with
which it wishes to communicate using an SDC address. The CS I/O port can
be configured to respond to SDC address 7, 8, 10, or 11.
CS I/O TCP Timeout
This setting, in units of seconds, will determine how fast the device will time
out on the open TCP connection. For Serial Server and MODBUS/gateway
configurations, the device will close the TCP connection if no activity is
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