36
default configuration with DHCP enabled, so the unit will then follow the sequence described in
the previous paragraph. Note that resetting the LAN interface removes any password protection.
The progress of establishing a LAN connection can be viewed either by inspecting the Interface
Settings menu (from the home screen press
Utilities
then
Interface Settings
) or by interpreting
the symbol shown on the status line of the home screen, which has four possible indications:
No LAN
If the unit cannot detect any connection to a LAN, e.g. the cable is unplugged,
then the LAN status indicator is
.
Configuring
The unit has detected a LAN connection but is not yet configured, e.g. is waiting
for DHCP. The LAN status indicator is animated, flashing between
and
LAN OK
The LAN connection is now configured and the unit can communicate. The
display becomes
LAN FAULT
The unit has detected a problem with LAN connection, e.g. Its IP address is in
use by another device. Communication is not possible and the display shows
LAN IP Address and Hostname
To communicate with the instrument through the LAN interface, the IP address (which was
allocated during the connection procedure described above) must be known. Once connected
and correctly configured, the IP address of the unit is displayed within the interface settings menu
(press
Home
, then select the
Utilities
menu then
Interface Settings
). Alternatively the address
can be obtained from the DHCP server, or by using the LXI Discovery Tool described below.
mDNS and DNS-SD Support
The instrument supports these multicast name resolution protocols, which allow a meaningful
host name to be assigned to the unit without needing an entry in the database of a central
nameserver. The desired hostname can be entered on the webpage (which will have to be
accessed by IP address the first time); spaces are not allowed. The name then appears in the
.
local domain (e.g. myLD400.local), if the accessing device is configured to support the protocol
(which is the case with most modern PCs). The default name is t followed by the serial number.
ICMP Ping Server
The unit contains an ICMP server allowing the instrument to be ‘pinged’ using its IP address as a
basic communication check, or by its host name if name resolution is working.
Web Server and Configuration Password Protection
The unit contains a basic web server. This provides information on the instrument and allows it to
be configured. The Configure and Instrument Control pages can be password protected to deter
unauthorised changes to the remote operation configuration; the default configuration is ‘no
password’. The Configure page itself explains how to set the password. The password can be up
to 15 characters long; note that the
User Name should be left blank
. The password and
hostname will, however, be reset to the default (no password) if the rear panel LAN reset switch
is used to reset all the LAN parameters to their factory default.
LAN Identify
The instrument's main web page has an 'Identify' function which allows the user to send a
command to the instrument which causes its display to flash until the command is cancelled.
LXI Discovery Tool
This tool can be used to display the IP addresses and other associated information of all
connected devices that comply with the VXI-11 discovery protocol. It is a Windows PC
application, which is provided on the supplied CD-ROM, that can be installed and run on the
controlling PC, with the unit either connected directly to the PC network connector or via a router.
Double clicking on any entry in the list of discovered devices will open the PC's web browser and
display the Home page of that device. For a later version of the tool that supports discovery by
both VXI-11 and mDNS visit
