Honeywell UDC2500 - Manual (Page 234)

Ethernet TCP/IP
220 UDC2500 Universal Digital Controller Product Manual 4/07
11 Ethernet TCP/IP
11.1 Overview
Ethernet parameters can only be configured via the Process Instrument Explorer
software.
Ethernet IP Address is 10.0.0.2 as shipped from the Factory.
The MAC address is printed on the case label of each instrument.
When constructing a network, it is recommended that a Switch be used to connect UDCs
to a LAN rather than using a Hub. This is because a Switch passes only those messages
for IP addresses that are connected to the Switch while a Hub passes all message traffic.
Using a Switch thus improves the overall throughput of the traffic to and from the UDCs.