Configure
3.4.4 AutoIP
The unit ships with a default IP address of 0.0.0.0, which automatically enables Auto IP within the unit.
AutoIP is an alternative to DHCP that allows hosts to automatically obtain an IP address in smaller networks
that may not have a DHCP server. A range of IP addresses (from 169.254.0.1 to 169.254.255.1) has been
explicitly reserved for AutoIP-enabled devices. The range of Auto IP addresses is not to be used over the
Internet.
If your unit cannot find a DHCP server, and you have not manually assigned an IP address to it, the unit
automatically selects an address from the AutoIP reserved range. Then, your unit sends out a (ARP) request
to other nodes on the same network to see whether the selected address is being used.
If the selected address is not in use, then the unit uses it for local subnet communication.
If another device is using the selected IP address, the unit selects another address from the AutoIP range and
reboots. After reboot, the unit sends out another ARP request to see if the selected address is in use, and so
on.
AutoIP is not intended to replace DHCP. The unit will continue to look for a DHCP server on the network.
If a DHCP server is found, the unit will switch to the DHCP server-provided address and reboot.
Note:
If a DHCP server is found, but it denies the request for an IP address, the unit does not attach to the network, but
waits and retries.
AutoIP can be disabled by setting the unit’s IP address to 0.0.1.0. This setting enables DHCP but disables
AutoIP.
3.5 Device Installer
Device Installer is a Windows-based utility for configuring embedded device servers like XPort and WiPort
devices. The XPort is found in products such as the NET232, NET232jr. and NET485 Serial to Ethernet
adapters. The WiPort is found in the Wi232 Wireless Serial to Ethernet adapter. Device Installer supports
several functions such as setting network parameters, pinging a network device, and changing baud rate.
The first operation you must do is to locate the device on your network and assign the device a fixed IP
address. Once the unit has a fixed IP address, you can use several methods to setup the unit for your specific
application.
Please locate and read the Device Installer User Guide found on the product CD. The manual can be read by
first clicking the
User Manual and Application Notes
button on the main page of the software CD, then
clicking on the
Device Installer
button. You can also browse the CD to find the manual. Locate the
doc
folder and double-click on Dev_Inst_UG_800233_x.pdf.
Note: the x designation in the Device Installer file name refers to the current revision level.
3-6
NET232/NETUSB User Guide
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