3M™ MicroTouch™ Controller RX181 Reference Guide
11
3M Touch Systems, Inc. Proprietary Information
Mounting the Controller
The controller is designed for internal mounting only. Choose a convenient spot away
from high-voltage, high power cables and electronics. Use 4-40 metal screws to mount
the controller using the two diagonal mounting holes in the board. The controller should
be mounted in line with the sensor cable exit point to minimize cable flexing. The
controller should be mounted internally behind or on the side of the display on stand offs
to allow room for the sensor cable connector.
Ensure that the tail and controller are aligned such that the tail remains straight (90
°
), not
pulled or twisted in an odd angle from the sensor. Good engineering design avoids
awkward electrical connections.
Supplying Power to the Controller
The RX181 controller is powered by the USB 5-volt bus power. The typical current is 15
mA typical, 28 mA touching;
±
5% regulation, 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.
Sensor Cable Connector
The sensor cable should have an 8-pin single row locking female connector that plugs
into the controller. The controller is compatible with the “XYXY” latched connector
pinout, not the “XXYY” style, non-latched connector pinout. Here, X or Y refers to one
or the other sheet, and + or – refers or the other side of the sheet. The calibration process
sorts out left/right and up/down.
Not recommended:
Do not twist the tail
Recommended:
Wrap tail smoothly
