Rockwell Automation 1761-NET-ENIW MicroLogix Ethernet Interface (ENI) User Manual - Manual (Page 42)

Publication 1761-UM006E-EN-P - August 2005
4-2 ENI/ENIW Configuration (Nodes 241 to 254)
Make Configuration Settings
COM Port Settings
Use the Utility Settings tab to set the following:
• COM Port – The PC’s RS-232 port that the communications cable
is plugged into, or the COM port that the Com Port Redirector is
configured for.
• Baud Rate – Set the baud rate to match the baud rate configured
for the ENI/ENIW. If you’re not sure which baud rate the
ENI/ENIW is configured for, try the available baud rates listed in
Table 4.2, starting with 38,400 and then 19,200. These are the
most commonly used baud rates.
• Parameter Upload Behavior and Parameter Download
Behavior – This setting controls which parameters will be saved
or loaded when you use the Load From or Save To buttons.
• Configuration Security Mask – The Configuration Security Mask
can limit which computers are allowed to configure the ENI or
ENIW over Ethernet, based on their IP Address. A Configuration
Security Mask of 000.000.000.000 or 255.255.255.255 allows any
computer to configure the ENI or ENIW over Ethernet.
Otherwise, the Configuration Security Mask acts as a filter on a
source IP address such that any mask octet set to the value of
255 becomes ‘don’t care’. Octets in the source IP and all other
fields must match exactly.
The following examples illustrate how the Configuration
Security Mask behaves:
If a Configuration Security Mask is set to 192.168.15.255
and an IP address of 203.129.75.23
is received, the packet is rejected because 203.129.75 does not
equal 192.168.15. The fourth octet (23) is ‘don’t care’.
If an IP Address of 192.168.15.76
is received, the packet is processed because the upper three
octets match. The fourth octet is still ‘don’t care’.