Integrator's Manual

A.2 IP_CONFIG

The IP_Config field allows you to select one of nine possible modes for assigning IP addresses

to the COM24 cards. A detailed description of each of these modes is given below.

0 = Default

This mode is programmed into the cards during the manufacturing process. In this mode,

each card generates a unique IP for itself using the following formula:

192.168.3.[ 1 + ( Chassis_ID x 16 ) + Slot_ID ]

Example: The card in slot #1 of chassis #1 is assigned an IP address of 192.168.3.18.

It is important to note that the COM24 cards do not possess a “default” IP address, and this

mode will not restore a card‟s original IP address in the event that a mistake is made when

changing these settings.

1 = DHCP_Persistent

This is the setting recommended for any COM1000 system that is

installed on a network expected to contain a DHCP server.

This mode will ensure that the cards will always have the same IP addresses, as each card

will store the initial IP address assigned to it in its memory and request the same address

from the DHCP server every time it reboots.

Because this mode stores the card‟s DHCP address to non-volatile memory, you may

choose to allow a DHCP server to assign unique IP addresses to the cards only during the

initial configuration process. The cards will continue to use these addresses after this

initial assignment even if there is no permanent DHCP server in the network.

If this mode is used and the system is initially set up in the absence of a DHCP server, be

aware that if they are ever rebooted in the presence of a DHCP server, the cards will

interpret it as being the “initial” setup and will be assigned new IP addresses. In this case,

you will lose communication with the COM24 cards until you reconfigure your computer‟s

IP interface so that it resides on a subnet compatible with the cards‟ new IP addresses.