15
Figure 9. Web LAN Configuration Page
4.4.1
TCP/IP Mode
The EM405-8 must have a unique IP address before it can communicate on a network. There are
several options for assigning an IP address to the unit. The option to choose is dependant upon
the type of network for which the EM405-8 is being configured.
DHCP: The Dynamic Host Control Protocol (DHCP) allows the module to dynamically retrieve
an IP address from a DHCP server at power-up. If DHCP is used, the EM405-8 may have a
different IP address assigned each time it is powered on or connected to the network. DHCP
requires that another device on the network is acting as a DHCP server. Otherwise DHCP will
fail and the IP address of the EM405-8 will not be properly configured.
Auto IP: Auto IP utilizes the Dynamic Link-Local Addressing protocol to acquire an IP address.
When performing Auto IP configuration, the device selects an IP address from a defined range of
169.254.0.0 to 168.254.255.255. It then performs an Address Resolution Protocol (ARP) query
to determine if the selected IP address is being used by any other devices on the network. If it is
free then the devices uses this IP address. If it is in use, the device selects another address from
the range. It repeats this process until an unused IP address is found. Auto IP is useful on
networks in which dynamic configuration is required yet a DHCP server does not exist.
C&H Technologies, Inc. <> 445 Round Rock West Drive <> Round Rock, Texas 78681 <> www.chtech.com
Содержание EM405-8
Страница 46: ...A 2 C H Technologies Inc 445 Round Rock West Drive Round Rock Texas 78681 www chtech com ...
Страница 47: ...N O T E S C H Technologies Inc 445 Round Rock West Drive Round Rock Texas 78681 www chtech com ...
Страница 48: ... C H Technologies Inc 445 Round Rock West Drive Round Rock Texas 78681 www chtech com ...