A-72
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
At minimum, a 2-wire connection is required—the controller's serial output (P2
pin 3) and Signal Ground(P2 pin 9). For two-way communications, the
controller's serial input (P2 pin 5) should also be connected to the host's
Transmit Data pin.
Data Set Ready (DSR) and Clear to Send (CTS) may be used by the host to
verify controller connections and operation. DSR is asserted when power is
applied to the controller and CTS is asserted when the controller's power-on
sequence is complete. For full hardware handshaking, also connect Data
Terminal Ready (DTR) and Request to Send (RTS). Elo drivers typically
require two-way communication and all four handshaking lines.
If accessible, the controller's diagnostic LED can verify whether RS-232 data is
being transmitted.
Alternatively, a breakout box will tell you if there is any activity on the data
line. It is possible that the port you are using on the host computer is meant to
work with an RS-232 DTE device. To check this, install a null modem cable
between the controller and the host computer's serial port. A null modem cable
converts a DCE device into a DTE device by swapping pins 2 and 3 and the
handshaking lines.
P2 Pins
DB25
DB9
Host Signal
Source
1
8
1
DCD
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
9
7
5
GND
Common
10
Key
9 7 5 3 1
10 8 6 4 2
Summary of Contents for AccuTouch 821615-000
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Page 78: ...B 83 2210 Serial Controller Figure B 2 E271 2210 Serial Controller...
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