12 3M™ MicroTouch™ Controller EX USB Reference Guide
3M Touch Systems, Inc. Proprietary Information -- 29489v05
Supplying Power to the Controller
The controller is designed to use USB bus power (that is, tap power from the USB port).
The source must deliver 75 mA typical -- 100 mA maximum, with a maximum ripple and
noise of 50mV peak-to-peak.
CAUTION
To avoid possible damage to the controller, you must provide a path for electrostatic
discharge. The controller-mounting hole near the sensor connector should be used to
connect to chassis safety ground and must be attached by the shortest possible route to
a good earth return (chassis) in all applications.
Mounting the Sensor
There are several methods for mounting the sensor depending on your application. If you
need instructions or recommendations from 3M Touch Systems on how to incorporate a
sensor into your design, refer to the 3M
TM
MicroTouch
TM
System 3250EX Integration
Guide (P/N 19-278). All 3M Touch Systems documentation is available from the
corporate website at www.3Mtouch.com
.
Turning On Your System
Before you turn on your custom system, ensure that all cables are connected properly and
that the controller is properly mounted.
To start up your system:
1. Turn on your display and computer.
2. Adjust the contrast and brightness to suit your personal preference and working
environment.
3. Adjust the horizontal and vertical position controls on the display to center the image
on the sensor.
If the driver has been previously loaded, the controller will enumerate and the PC will
beep when hot plugging the controller into a USB port. When disconnecting the
controller, the PC will beep again.
Status Light (LED) Diagnostics
3M™ MicroTouch™ controllers are highly reliable units; however, there may be
occasions when the controller does not perform exactly as you expected. The EX USB
controller provides diagnostic feedback with a light emitting diode (LED) on the
component side of the board that indicates the status of the touch system.
If the LED is on, and remains dimly lit, the controller has power and is operating
properly. If the LED is off, the controller is not receiving power or USB communications
have stopped and the controller is in suspend mode.
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