The TLS client needs to be set to communicate on this port number. If secure communications
come in on the TLS Proxy Service Port, the NL241 will attempt to open a TCP connection to the
data logger on the TLS Proxy Forward Port. Also, regardless of this setting, the NL241 Secure
Proxy Server will always listen on the secure HTTP (HTTPS) port number 443. If a secure
connection is established on this port, the NL241 will attempt to communicate to the data logger
on the HTTP port 80 (range 1 to 65535).
B.6.3 TLS Proxy Forward Physical Port
When doing TLS Proxy communications, the NL241 TLS server maintains a secure connection
with a remote client. If the TLS Proxy Forward Physical Port is specified to be the CS I/O Port, the
NL241 will open a TCP connection with the data logger over the CS I/O port and do unencrypted
data transfer with the data logger. If the TLS Proxy Forward Physical Port is specified to be Wi-Fi,
the NL241 will open the TCP connection over Wi-Fi on the TLS Proxy Forward IP Address.
B.6.4 TLS Proxy Forward IP Address
Secure communications received on the NL241 TLS server will be forwarded on a non-secure TCP
connection to this IP address. If the TLS Proxy Forward Physical Port is specified to be the CS I/O
Port, this setting does not need to be set by the user since the NL241 will obtain the IP address of
the data logger automatically. The data logger must be configured with a static IP address that is
unique and that exists on the same subnet as the NL241 IP address. If the TLS Proxy Forward
Physical Port is specified to be Wi-Fi, the forward IP address must be specified. Enter the IP
address of the destination data logger here.
B.6.5 TLS Proxy Forward Port
When doing TLS Proxy communications, the NL241 TLS server maintains a secure connection
with a remote client. If the TLS Proxy Forward Physical Port is specified to be the CS I/O Port, the
NL241 will open a TCP connection with the data logger over the CS I/O port and do unencrypted
data transfer with the data logger. If the TLS Proxy Forward Physical Port is specified to be Wi-Fi,
the NL241 will open the TCP connection over Wi-Fi on the TLS Proxy Forward IP Address.
In order to communicate with the connected data logger TCP server, the NL241 TCP client
application must open a socket to that server. The socket of the data logger TCP server is
uniquely identified by an IP address and a port number. This entry is where the port number of
the NL241 TCP client is set. The data logger TCP service port must be set to communicate on this
port number.
If secure communications come in on the TLS Proxy Service Port, the NL241 will attempt to open
a TCP connection to the data logger on the TLS Proxy Forward Port. Also, regardless of this
setting, the NL241 TLS Proxy Server will always listen on the secure HTTP (HTTPS) port number
NL241 Wireless Network Link Interface
61
