Keithley 2450 Reference Manual page 88

Model 2450 Interactive SourceMeter® Instrument Reference Manual
When a USB device that implements the USBTMC or USBTMC-USB488 protocol is plugged into the
computer, the VISA driver automatically detects the device. It is important to note that only USBTMC
and USBTMC-USB488 devices are automatically recognized by the VISA driver. Other USB devices,
such as printers, scanners, and storage devices, are not recognized.
In this section, "USB instruments" refers to devices that implement the USBTMC or
USBTMC-USB488 protocol.
The full version of National Instruments (NI
other kind of USB device that you want to communicate with VISA.
Using USB
A USB cable is shipped with the instrument. If the original cable is not available, you will need a USB
cable with a USB Type B connector on one end and a USB type A connector on the other end for
each instrument you plan to connect to the computer at the same time using the USB interface.
1. Connect the Type A end of the cable to the host computer.
2. Connect the Type B end of the cable to the instrument.
3. Turn power to the instrument on.
4. When the host computer detects the new USB connection, the Found New Hardware Wizard will
start.
5. On the "Can Windows connect to Windows Update to search for software?" dialog box, click No,
and then click Next.
6. On the "USB Test and Measurement device" dialog box, click Next, and then click Finish.
Communicate with the instrument
For the instrument to communicate with the USB device, you must use NI-VISA
resource string in the following format to connect to the correct USB instrument:
USB0::0x05e6::0x2450::[serial number]::[INSTR]
Where:
•
0x05e6: The Keithley vendor ID
•
0x2450: The instrument model number
•
[serial number]: The serial number of the instrument (the serial number is also on the rear
panel)
•
INSTR: Use the USBTMC protocol
To determine these parameters, you can run the Keithley Configuration Panel, which automatically
detects all instruments connected to the computer.
If you installed the Keithley I/O Layer, you can access the Keithley Configuration Panel through the
Microsoft
2450-901-01 Rev. B/September 2013
® ®
Windows Start menu.
®
) VISA provides a utility to create a USB driver for any
Section 2: General operation
TM
. VISA requires a
2-61