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3.7.2 VISA Libraries
VISA libraries provide an standardized application interface for user pro-
grams and outputs that communicate with standard hardware ports such as
PC COM ports, PCI bus, and USB ports. VXI-11 compliant VISA librar-
ies provide VXI-11 calls over the TCP/IP network to communicate with
VXI-11 instruments as shown in Figure 3-2. Agilent, Kikusui and National
Instruments (NI) provide VXI-11 capable VISA and SICL libraries. While
all three VISA libraries run in WIN32 operating systems, VISA libraries
variations are available for some UNIX, LINUX and other operating systems.
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Figure 3-2 VISA to VXI-11 Communication Path
3.7.3 Using Agilent’s VISA
Use version 15.0 or later of Agilent’s VISA. It includes VXI-11.2 and VXI-11.3
functions and has been rewritten to work better with VXI-11.3 instruments.
You do have to be sure to keep the link to the 8099 open since Agilent’s VISA
will close the channel when the link count drops to zero. It also inserts non-
VXI-11 commands in with valid commands while doing instrument discovery.
Agilent is aware of these problems and may fix them in future releases.
Configure the 8099 with Auto-disconnect on when using Agilent's VISA.
Perform the following steps to make a connection to the 8099:
1.
Open the Agilent Connection Expert
2.
Establish that a LAN interface is created. If none exists, create one.
3.
Highlight the LAN TCPIPO interface and change its properties.
Select VXI-11 and reduce the default timeout to 10 seconds.
4.
Click the Add Instrument button on the menu bar. The auto discovery
algorithm should find the 8099 and display a list of found devices.
Содержание 8099
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