Elo TouchSystems IntelliTouch SecureTouch RS-232 Connections, P2 Pins DB25, Host Signal Source

RS-232 Connections

Review cable connections and switch settings. If you have used your own cables or adapters for connection to the serial port, check pinouts. Verify that the data transfer rate (baud rate) of the computer's serial port is the same as selected by switches or jumpers on the controller.

The IntelliTouch serial controllers operates at standard RS-232 levels. The serial port connector, P2, is a 2x5 header with pins on 0.100-inch centers. It is configured so a ribbon cable and commonly available insulation displacement connectors (IDCs) may be used. Pin positions and signals are given below. See page 60 for DB9 and DB25 connector pin positions.

9 7 5 3 1

		X
		10	8	6	4	2
Figure A.1 Pin positions for the serial port connector
	P2 Pins	DB25	DB9		Host Signal		Source
1		8	1		DCD (N/C)		Controller
2		6	6		DSR		Controller
3		3	2		RXD		Controller
4		4	7		RTS		Host
5		2	3		TXD		Host
6		5	8		CTS		Controller
7		20	4		DTR		Host
8		22	9		RI (N/C)		N/C
9		7	5		GND		Common
10							Key

Table A.1 Serial port controller signals

The controller only requires a 2-wire connection, controller Transmit Data (P2 pin 3) and Signal Ground (P2 pin 9). For two-way communications, the controller Receive Data (P2 pin 5) should also be connected to the host Transmit Data pin.

A-54I n t e l l i T o u c h / S e c u r e T o u c h G u i d e