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3M™ MicroTouch™ Controller RX142 Reference Guide

3M Touch Systems, Inc. Proprietary Information

Figure 1. RX142 Overall Dimensions

Handling and ESD Protection

When mounting the sensor and controller, use normal precautions for handling

electrostatic sensitive devices. The RX142 has internal protection to ±20 kV for ESD air

discharges to the sensor (not to the controller directly) that may occur during normal

operation of the sensor. Refer to Appendix A for further specifications.

Establishing the Data Connection

The RX142 controller requires an RS-232 serial plug and play communication cable

attached to connector JP2. You can use a standard 3M™ MicroTouch™ RS-232 plug and

play cable (P/N 7319630) or an equivalent interconnect. One end of this cable plugs into

the RS-232 connector (JP2) on the RX142 controller. The other end, which has a 9-pin D

connector, plugs directly into a serial COM port on your PC. The 9-pin D connector also

has an input in the connector body for an external 5V power supply. Table 1 describes the

interconnections for the RS-232 cable.

Table 1 COM Cable for RX142 Controller

PC Side (9-Pin D)

Controller Side (8-Pin Molex)

Pin

RS-232 Assigned

Jumpered to:

Pin Description

1

Data Carrier Detect (DCD)

4 and 6 DTR and DSR

8

DCD, DTR, DSR

2

Receive Data (RXD)

2

Transmit Data (TXD)

3

Transmit Data (TXD)

3

Receive Data (RXD)

4

Data Terminal Ready (DTR) 1 and 6 DCD and DSR 8

DCD, DTR, DSR

5

Signal Ground

5

Power supply ground

6

Data Set Ready (DSR)

1 and 4 DCD and DSR 8

DCD, DTR, DSR