A-54
I 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
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.
Figure A.1
Pin positions for the serial port connector
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.
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
X
9
7
5
3
1
10
8
6
4
2
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