9 - Remote Operation
29
QPX750 Instruction Manual
9.2
LAN Interface
The LAN interface is designed to meet 1.5 LXI Device Specification 2016. Remote control using the LAN
Interface is possible using the TCP/IP Sockets protocol. The instrument also contains a basic web server
which provides information on the instrument and allows it to be configured from a web browser.
Simple command line control from the browser is also possible.
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 the menus from
the front panel to reset the instrument's interfaces to the factory default.
The default setting is for the instrument to attempt to obtain settings via DHCP if available or, if DHCP
times out (30 seconds), via Auto-IP.
In the very unlikely event that an Auto-IP address cannot be found, a static IP address of
192.168.1.100 is assigned. Resetting the LAN removes any password protection which has been set on
the web page.
To reset the LAN interface, touch the LAN Reset button on the ‘Interface’ menu.
For more information on LXI standards refer to
9.2.1
LAN Connection
To use the LAN Interface, the IP address or the host name of the instrument must be known.
The assigned IP address of the instrument may be determined from the front panel controls by
pressing the Interface button. Then select LAN Status and the assigned IP settings will be shown on the
second page of the displayed menu.
Alternatively, Windows PC software tools such as the LXI Discovery Tool may be used find all LXI
compliant devices on the network. The latest version of the LXI Discovery Tool can be downloaded
from www.lxistandard.org.
Note that older versions of the LXI Discovery Tool may not find this instrument as they only support
the legacy VXI-11 protocol which is not implemented in this instrument.
Connecting via a router is recommended as this is significantly quicker to assign an IP address;
connecting directly to the PC will begin to assign an IP address only after a 30 second DHCP time-out.
Double clicking on any entry in the list of devices discovered will open the PC's web browser and
display the Home page of that device.
There are also tools for LAN discovery included as part of the National Instruments Measurement and
Automation Explorer package and the Keysight (formerly Agilent) Vee application.
The unit will, when first powered up, attempt to obtain settings via DHCP if available or, if DHCP times
out (30 seconds), via Auto-IP. In the very unlikely event that an Auto-IP address cannot be found a
static IP address of 192.168.1.100 is assigned. During this time, the LAN indicator will keep flashing
and change to
if a LAN connection is successfully made. However, if a connection is still not
made by the end of the above process, or if the LAN connector is physically removed at any
time, the LAN field in the status line will change to
;see ‘LAN error’ section for details.
