n
Device Trigger, DT1
You can start a new measurement from
the controller via interface message GET
(Group Execute Trigger).
n
Bus Drivers, E2
The GPIB interface has tri-state bus driv
-
ers.
Using the USB
Interface
The counter is equipped with a USB full
speed interface, which supports the same
SCPI command set as the GPIB interface.
The USB interface is a full speed inter-
face (12 Mbit/s), supporting the industry
standard USBTMC (Universal Serial Bus
Test and Measurement Class) revision
1.0, with the subclass USB488, revision
1.0. The full specification for this proto-
col can be found at www.usb.org
.
A valid driver for this protocol must be
installed to be able to communicate over
USB. We recommend NI-VISA version
3.2 or above, which is available for sev
-
eral operating systems, from National In
-
struments (www.ni.com
). The Windows
version is supplied on the CD.
In order to test the communication and
send single commands, the National In
-
struments utility supplied with the
NI-VISA drivers can be used to open a
“VISA session” to send and receive data
from the instrument, and also set control
signals such as Remote or Local.
Third party application programs, such as
LabView, normally support USB com
-
munication directly, for example through
the Instrument I/O Assistant.
Custom specific programs using USB
communication can be written in C/C++,
supported by libraries and lib-files sup
-
plied with the NI-VISA driver (default
location C:\VXIPNP\WinNT\). A sample
program is found on page 4-11.
Instruments connected to the USB bus
are identified with:
Vendor ID: 0x14EB for Pendulum Instru
-
ments.
Model ID: 0x0090 for the '90' and serial
number of the instrument.
This data is combined to form a unique
identifier string such as:
USB\VID_14EB&PID_0090\991234 or
“USB0::0x14EB::0x0090::991234::INSTR”
When connecting to the instrument, any
part of this string may be used to identify
the instrument, for example any instru-
ment from this vendor, any instrument of
a certain type or a specific instrument
serial number.
1-6 Using the USB Interface
Getting Started
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