Laurel Electronics Ethernet Node Configuration for Series 2 Digital Panel Meters, Counters, Timers, Transmitters and Ethernet-to-Serial Device Servers - Manual (Page 39)

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GATEWAY IP: Enter the static IP address of your LAN's gateway router if you want to be able to
address your Nodes from anywhere over the Internet. This address is normally provided by your
organization's IT department. Leave the entry at 0.0.0.0 if you do not want address your Nodes
from anywhere over the Internet. Press GO to enter any change. A gateway router is a device
which provides the entrance to a local area network (LAN). This is normally a router which assigns
dynamic IP addresses and also serves as a firewall. A gateway can interface a first LAN to another
LAN or to the Internet.
SUBNET MASK: Enter the subnet mask for your LAN's gateway router if you want to be able to
address Nodes on the LAN from anywhere over the Internet and if a subnet mask entry has been
requested by your organization's IT department. A subnet mask is a way of telling your router
which network addresses it can consider local and which are remote. Leave at 0.0.0.0 to disable
the subnet mask feature. Press GO to enter any change.
TCP TIME-OUT: Change “TCP Connection Timeout” from its factory default of 32 seconds if so
desired. Minimum timeout is 16 seconds. Enter 0 to disable timeout. If TCP activity has not been
detected by the Node for this timeout period, the TCP connection is broken by the Node. Press GO
to enter any change.
MODBUS TCP PORT: Enter the TCP port number of the Node or leave that number at 502 if you
have no reason to change. Press GO to enter any change. The standard TCP port number for
Modbus is 502. It is possible to use a different port number, provided that both the client and
server can be set to use a different port number. This may not be possible, and in most cases it
will be most convenient to just use the standard port number 502. Our Node discovery software
uses TCP port 502 and UDP port 63179.
HTTP PORT: Enter the HTTP port number of the Node or leave that number at 80 if you have no
reason to change. Press GO to enter any change. By default, port 80 is used by URLs that begin
with http:// and is the default port number for HTTP communications. Port 443 is used by URLs
that begin with https:// . Only enter a port number other than 80 if that number has been blocked
by the IT department and a different number has been supplied. If the port number is changed to
anything other than 80, all web addresses that reference the Node must include that port number.
DISCOVERY PORT: Enter a second UDP port number if required. Leave the UDP number at 63179
if you do not require a second UDP port number. Press GO to enter any change. The TCP and UDP
protocols specify a source and destination port number in their packet headers. A port number is
a software construct associated with permissions for an application such as our Node discovery.
Our Node discovery software uses TCP port 502 and UDP port 63179. If port 63179 is blocked by
a router, this field can be used to enter a second UDP port number, which will then be used for
Node discovery in addition to 63179.
AUTO-DISCOVERY: This default selection permits the Node to broadcast a 70-byte self identifi-
cation message over the LAN every 15 seconds, a very light load on the network. This allows the
Nodes to discover each other's IP Addresses, thereby greatly facilitating network setup and
maintenance.