User`s guide

New Serial:
4) If you are doing a serial (RS-232, RS-422 or RS-485) connection: in the
window that appears, give your comm port a name, then specify the comm port
number and its parameters. This information is usually available from your
device’s manual. The default timeout value of 1000 is fine. Most likely flow
control will be off.
New Ethernet:
5) If you are doing an Ethernet connection: in the window that appears, give your
connection a name, then enter the IP address of the device. You will need to
configure your device with a valid IP on your subnet. The device manual should
explain how to do this. If you don’t know what a valid IP is, or for that matter
what subnet means, you should ask an IT person or get help from the device
manufacturer. There is also an Ethernet Primer at the end of this guide.
Next, you will need to enter the IP port. Ethernet is really a big bundle of
different communication lines. Each one is assigned a port number. Certain ports
have standard uses. For example, port 80 is typically used by the web for HTTP
requests. ModbusTCP is typically on port 502. Once again, you will need to
check with your device for the proper Ethernet port. If you don’t enter the correct
port, you will not be able to communicate with your device. Finally, a timeout of
1000 is more then adequate for most cases.