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10
Handling and ESD Protection
When mounting the sensor and controller, use normal precautions for handling
electrostatic sensitive devices. The SX serial controllers have internal protection to ±27
kV for ESD discharges to the sensor (not to the controller directly) that may occur during
normal operation of the sensor. Refer to the appendices for further specifications.
Establishing the Data Connection
You will need a method of establishing the serial data communication between the
controller and your system. You can build your own or purchase the standard 3M™
MicroTouch™ RS-232 serial cable (P/N 7310101). Table 1 describes the pins for this
cable, which connects to a serial communication (COM) port on the PC.
Table 1 Controller Pinouts for JP1, JP2 and JP3 Connectors
Pin
1
2
3
4
5
6
7
Mounting the Controller
The controller should be mounted on the chassis inside the monitor. Choose a convenient
spot away from high-voltage, high power cables and electronics.
Supplying Power to the Controller
You must supply the SX112 controller with power (+12 VDC) through a custom serial
cable configuration. Exact specifications can be found in Appendix A.
Note: However you supply power, the source must deliver >100 mA @ 12V ±5%
typical with a maximum ripple and noise of 50mV peak-to-peak. Mounting posts should
be grounded to the chassis.
Using a Custom Serial Cable Design
When creating a custom serial cable connection, you can provide power to the controller
through the mating Molex connector:
1. Obtain a 7-pin Molex connector 51004-0700.
2. Attach power and return to the connector (Pin 1: +12V, Pin 2: Ground).
3M™ MicroTouch™ Controller SX112 Reference Guide
JP1 (Sensor)
JP2 (Pen)
UL
Ground
UR
Pen Tip
Shield
Reserved
LR
Reserved
LL
Reserved
Ground
Shield
N/A
N/A
3M Touch Systems, Inc. Proprietary Information
JP3 (Power)
+12V
Ground
Receive data (RXD)
Transmit date (TXD)
Reserved
Reserved
Reserved
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