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LabJack U12 Quickstart Guide
Revision 1.09
9/8/2003
LabJack Corporation
www.labjack.com
support@labjack.com
For the complete LabJack U12 User's Guide or the latest version of the LabJack software, go to
www.labjack.com.
The LabJack U12 is a measurement and automation peripheral that enables the connection of a
PC to the real world. Although the LabJack U12 has many redundant protection mechanisms, it
is possible, in the case of improper and/or unreasonable use, to damage the LabJack and even
the PC to which it is connected. LabJack Corporation will not be liable for any such damage.
Installation
The LabJack U12 requires a PC running Windows 98SE, ME, 2000, or XP. To determine your
operating system version, go to
Start => Settings => Control Panel => System => General
and make sure the version number is 4.10.2222 or higher (Win98SE=4.10.2222,
WinME=4.90.3000, Win2000=5.0.2195, WinXP=5.1.XXXX).
It does not matter if the hardware or software is installed first.
If you experience installation problems on Windows 98 Second Edition, before contacting us,
please go to the downloads page at labjack.com and download "win98sehid.zip" (see the
readme file for more information).
Hardware Installation
With the PC on and using the included cable, connect the LabJack U12 to the USB port on the
PC or USB hub. The USB cable provides power and communication for the LabJack U12. The
status LED should immediately blink 4 times (at about 4 Hz), and then stay off while the
LabJack enumerates.
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Summary of Contents for LabJack U12
- Page 1 Hardware Installation With the PC on and using the included cable, connect the LabJack U12 to the USB port on the PC or USB hub. The USB cable provides power and communication for the LabJack U12. The status LED should immediately blink 4 times (at about 4 Hz), and then stay off while the LabJack enumerates.
- Page 2 Enumeration is the process where the PC’s operating system gathers information from a USB device that describes it and it’s capabilities. The low-level drivers for the LabJack U12 come with Windows and enumeration will proceed automatically. The first time a device is enumerated on a particular PC, it can take a minute or two, and Windows might prompt you about installing drivers.
- Page 3 • IO0 – IO3: Connections to 4 of the LabJack’s 20 digital I/O are made at the screw terminals, and are referred to as IO0-IO3. These 4 channels include a 1.5 k Ω series resistor that provides overvoltage/short-circuit protection.
- Page 4 LJconfig: Sets the local ID of a particular LabJack. This is useful if multiple LabJacks are connected to the USB. Every LabJack has a local ID and serial number. The local ID is a value between 0 and 255 that can be changed by the user. The serial number is a value between 256 and 2,147,483,647.
- Page 5 AIBurst: Reads a specified number of scans (up to 4096) at a specified scan rate (up to 8192 Hz) from 1,2, or 4 analog inputs. First, data is acquired and stored in the LabJack’s 4096 sample RAM buffer. Then, the data is transferred to the PC.
- Page 6 Watchdog: Controls the LabJack watchdog function. When activated, the watchdog can change the states of digital I/O if the LabJack does not successfully communicate with the PC within a specified timeout period. This function could be used to reboot the PC allowing for reliable unattended operation.
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