TREND IQView8 - Ethernet Addressing Configuration; Automatic vs. Manual IP Addressing; Network Communication Across Routers

8 IQView8 Touch Screen Display Data Sheet TA201232 Issue 2, 10-Jul-2012
IQView8 Data Sheet
Automatic Addressing
When in auto addressing mode the IQView8 obtains IP
addressing information (IP address, subnet mask, default
router, and WINS Server) from a DHCP server. This means that
its IP address and other IP addressing information may change.
If there is no DHCP server, or the DHCP server fails, the
IQView8 enters link/local mode where it auto-negotiates its
IP address with other devices on its Ethernet segment. There
may be a delay between DHCP server failure and the IQView8
entering link/local mode as it will only prompt the DHCP server
after its lease has expired which may be a long time.
Link/Local Operation: When in link/local mode IP addresses
start at 169.254.0.0 with subnet mask of 255.255.0.0; ensuring
all devices in link/local mode are on the same subnet, the
default router, and WINS server address remain at their last
settings. Any devices wanting to communicate with them using
IP addressing must be on this subnet.
IQView8 and most other Trend Ethernet devices are set to
automatic IP addressing by default. If a group of these devices
are connected together on an Ethernet segment (without DHCP,
WINS servers) they will power up in link/local and auto-negotiate
their IP addresses. If set up with network addresses and Lan
numbers they will construct a Trend network. A supervisor
or tool running on a PC on the same segment will be able to
communicate with them using host names (if the PC is set up for
auto-addressing). Such a system cannot form a network across
a routers; this would require the setting up of DHCP and WINS
servers and the remote devices table.
Fixing the IQView8’s address on a DHCP controlled
System: It is possible for the IQView8 to operate in a DHCP
regime with a xed IP address by setting up the DHCP server
so that it always gives the IQView8 the same IP address. An
alternative is to set the IQView8 to use manual addressing and
set its IP address outside the range of the DHCP server.
Communicating with an automatically addressed
IQView8: Because the IQView8’s IP address may not remain
the same any connection to it over Ethernet, e.g. to send alarms,
must use a host name. For more details see ‘Host names’.
Crossing Routers if DHCP is operating: In the DHCP regime,
if the internetwork is to be built across a router(s), the devices
in the remote devices table must be specied using their host
name and subnet mask.
Manual Addressing
When in manual addressing mode the IQView8’s IP addressing
information (IP address, subnet mask, default router, and WINS
Server) are specied manually (i.e. the IP address is xed).
Communicating with a manually addressed IQView8:
Communication with an IQView8 can be made using either the
host name or IP address. For more details see ‘Host names’.
Crossing Routers
If the internetwork is to be built across a router(s), one or
more devices must be congured so that they are capable of
becoming the cross router master by specifying their remote
devices table. The devices in the remote devices table can
be specied using their host names and subnet mask, or IP
address and subnet mask, for DHCP systems host names must
be used.
The remote devices table must contain the details of the two
devices with the lowest IP address in the network from each
other subnet and be set up in every device on the local subnet.
For increased reliability, details of additional devices should
also be set up.
Note that IQView8 cannot act as the cross router master as it
does not have the facility for a remote devices table. It can form
an internetwork across routers providing there is another device
acting as the cross router master.
Use Across Routers
If the connection is to be across routers a Windows Internet
Naming Service (WINS) server must be used to enable the
device communicating with the IQView8 to obtain its IP address.
Each device must be set up with the IP address of the WINS
server. The IQView8 sends its host name to the WINS server on
power up. Devices wishing to communicate with IQView8 send
the host name to the WINS server which returns the associated
IP address.
If a WINS server is not present the host name can only be used
over the local segment (i.e. not across routers).
Use in a DHCP Regime
Because the IQView8’s IP address may not remain the same
the host name must be used to communicate with the IQView8
when automatic addressing is being used.
Host names
The IQView8 has a host name, which provides a user friendly
method of accessing the IQView8 e.g. to send an alarm, or
build an internetwork across routers in a DHCP regime. Teh
host name should be used to address the IQView8 when its IP
address may vary e.g automatic addressing.
The host name defaults to TREND_xx_yy_zz where xx, yy
and zz are the last 3 groups of number in the IQView8’s MAC
address.
ETHERNET ADDRESSING
The IQView8’s Ethernet addressing information (IP address, subnet mask, default router, and WINS Server) can be set up
automatically (automatic addressing) or manually (manual addressing). Automatic addressing enables it to operate on an
Ethernet system where the IP addressing information is automatically allocated by a Dynamic Host Conguration Protocol (DHCP)
server, or specied manually. Manual addressing enables it to operate on a system where the addressing information is dened
manually and a DHCP server is not available. The default mode of operation is automatic addressing enabling the IQView8 to be
easily set up.