Kikusui PAV10-20, Руководство пользователя

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PAV LAN
39
Socket Communication
The PAV LAN VISA driver is a typical driver in the testing and measurement field. However,
you may not be able to use VISA due to installation or license issues or because the control-
ler does not support VISA (e.g., industrial PLC).
If you cannot use the VISA driver, you can use the socket communication feature of the PAV.
Socket communication is a low-level LAN protocol available in most operating systems and
programming environments.
Communication using sockets
In socket communication, a connection is established through a socket, and SCPI text com-
mands are exchanged through this socket.
The function that manages sockets in programming languages is called the TCP stack.
Two socket protocols are available: TCP
(p.40) and UDP (p.40) .
A port number is assigned to each socket.
Controller access (single or multiple clients)
Security settings can be applied to webpages to limit the number of PCs (clients) that connect
to the PAV at any given time.
● Limitation to single and multiple clients
The performance of webpages through the PAV LAN interface is affected by the number of
simultaneously used webpages, ports, and sockets. We recommend up to three simultane-
ous uses.
Item Single client Multiple clients
Not logged in to web-
pages
Multiple webpages can be
opened simultaneously. Access
is display only; the PAV cannot
be controlled.
←
Logged in to webpage
using “admin”
If a VISA or socket port is open,
login is not possible. After log-
ging in, communication from
other devices are shut off.
←
VISA communication
Only a single VISA port can be
opened.
←
TCP socket
If a VISA or “admin” webpage is
not open, only a single TCP
socket can be opened. UDP
sockets are shut off. If a VISA or “admin” webpage is
not open, multiple connections
are possible through TCP and
UDP sockets.
UDP socket