3M™ MicroTouch™ Controller RX142 Reference Guide

11

3M Touch Systems, Inc. Proprietary Information

PC Side (9-Pin D)

Controller Side (8-Pin Molex)

Pin

RS-232 Assigned

Jumpered to:

Pin Description

7

Request to Send (RTS)

1

Request to Send (RTS)

8

Clear to Send (CTS)

4

Clear to Send (CTS)

9

Not Used

Do not ground

Sleeve

6

DC power jack (+5 VDC)

Pin

7

Cable shield connected to

ground. DC power jack

ground

Shell

7

Chassis (earth) ground

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

You must supply the RX142 controller with power. The source must deliver (for 5 VDC)

16 mA typical, 27 mA touching;

± 5% regulation or (for 12 VDC) 19 mA typical, 30 mA

touching;

± 5% regulation, with a maximum ripple and noise of 50 mV peak-to-peak.

You can supply power to the RX142 controller using any of the following methods. The

voltage input can be either +5VDC or +12VDC. In Sleep Mode the controller draws less

than 5 mA.

Not recommended:

Do not twist the tail

Recommended:

Wrap tail smoothly