System Definition Information; Physical Address; Ip Address - Hitachi CMU Series User Manual

5 USER GUIDE

5.4 System Definition Information

Set the following ② and ③ information for CMU (LQP520). Do not set ② in duplicate
with another station. Item ③ needs to have a consistent value throughout one single
subnetwork.
① Physical address: An original number is set for each CMU.
② IP address: Define these items for each CMU by using the Base System too.
③ Subnetwork mask: Define these items for each CMU by using the Base System too.

5.4.1 Physical address

A 48-bit physical address is assigned to each CMU.
This is a unique address; the user cannot change it.

5.4.2 IP address

The IP address used for TCP/IP and UDP/IP is a 32-bit logical address. An IP address consists
of a network number and a host number. There are three types of address assignment depending
on the number of hosts.
(i) Class A (The high-order one bit of the network number is set to 0.)
(ii) Class B (The high-order two bits of the network number are set to 10 in binary.)
(iii) Class C (The high-order three bits of the network number are set to 110 in binary.)
Network number
(8 bits)
Network number
(16 bits)
Network number
(24 bits)
Host number (24 bits)
Host number (16 bits)
Host number (8 bits)
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