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5.7.8 Programming Using Sockets
5.7.8.1 Socket Description
The VISA drivers for the Power Supply are commonly used in the Test and
Measurement industry. For customers who cannot use VISA because of installation, licensing
issues or because the controller (i.e.: industrial PLC) does not support VISA, the offers
socket connections. Socket is a low-level LAN protocol that is universally available in all operating
systems and programming environments.
5.7.8.2 Communicating Using Sockets
Communicating through sockets involves opening a socket connection, sending SCPI text
commands and reading the responses. The function by which a programming language manages
the socket is the TCP stack.
There are two types of socket protocols which may be used: TCP and UDP. Each has its own port
number, as described in sections 5.7.8.6 and 5.7.8.7.
5.7.8.3 Controller Access: Single and Multiple Clients
The web page has a security setting to limit or enable the types of connections and the numbers of
control computers (called “clients”) that may be connected at a time.
The single or multiple clients setting may be viewed on the LAN Configure Modify web page.
NOTE:
The performance of the
LAN interface is impacted as more web pages, ports and
sockets are open at the same time. No more than two pages are open at the same time.
The rules for the One Client/Multiple Clients are:
Web Page Not logged-in Maximum of 2 copies of the web page may be open at any time.
You may view but cannot change the Power Supply operation.
Web Page
You cannot log in as ‘admin’ if a VISA or TCP socket port is already open.
If you are logged in, any VISA, TCP or UDP connections are blocked.
Only one VISA port may be open at a time.
One TCP socket may be open
if no VISA or ‘admin’ web page is
open. UDP sockets are blocked.
Multiple connections of TCP and UDP are
allowed to be open at a time, if no VISA or
‘admin’ web page is open.
UDP Socket
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