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3M™MicroTouch™ System DST2270DX Integration Guide
3M Touch Systems, Inc. Proprietary Information – TSD-25739
Serial Connection
For serial mode, the DX123 controller uses and 3M Touch Systems RS-232 plug and
play cable (P/N 7319630) or an equivalent interconnect.
One end of this cable plugs into the RS-232 connector (J104) on the DX123 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. The following table describes the interconnections for the 3M Touch
Systems RS-232 cable.
Serial Cable for DX123 Controllers
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
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 5V
6
DC power jack (+5
VDC)
Pin
Ground
7
Cable shield connected
to ground. DC power
jack ground
Supplying Power to the Controller
The DX123 controller must be self-powered by a separate 5 VDC or 12 VDC power
input. The USB 5 V bus power is only used for the USB pull up and to establish USB
communications. The controller consumes 90 mA at 5 VDC or 12 VDC; 100 mA max,
±
10% regulation, with a maximum ripple and noise of 50 mV peak-to-peak.
Note
: You need only to supply either 5V or 12V -- whichever is most convenient that
will provide sufficient power for you as the integrator. Refer to the following section for
information on locating power for your controller.
You supply power to the DX123 controller using the 3-pin power connector J107 (Molex
22-05-3031). Use a mating 3-pin connector (Molex 22-01-3037 and Pins 08-50-0114),
pin 1 is 5 VDC, pin 2 is the GND return, and pin 3 is 12 VDC.
