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Since it is possible to misconfigure the LAN interface, making it impossible to communicate with the
instrument over LAN, a LAN Configuration Initialise (LCI) mechanism is provided via a push switch
(marked
LAN reset)
accessible through a small hole in the rear panel. This restores the 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 by interpreting the LAN indicator
shown on the display.
No LAN
If the unit cannot detect any connection to a LAN, e.g. the cable is
unplugged. The
{LAN}
indicator is not displayed.
Configuring
The unit has detected a LAN connection but is not yet configured, e.g.
is waiting for DHCP. The
{LAN}
indicator is displayed.
LAN OK
The LAN connection is now configured and the unit can communicate.
The
{LAN}
indicator is displayed.
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
The
{LAN}
indicator is not displayed.
14.4.1
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 address can be obtained from the DHCP server, or by using the LXI Discovery Tool
described below.
14.4.2
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.
my1908.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.
14.4.3
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.
14.4.4
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.
14.4.5
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 the
{LAN}
indicator to flash until the command is cancelled.
