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Serial ASCII Keypad Reader
Serial ASCII Specifications
Normal Serial and Inverted Serial signals are open collector out-
puts with 2.2K pull-ups to the internal +5v. An annunciator beeps
with each key press. When the LED control input is pulled low, the
GREEN LED will be on and the RED LED will be off. When the input
goes high, the RED LED is on and the GREEN LED is off. The RED
LED will blink with every key press. The LED control input is pulled
to the internal +5v with a 2.2K resistor. An output is generated with
each key press which can be used to drive a CCTV or Security
Light. Available through the BLUE wire (see Connector Wiring), this
is an open collector output capable of sinking 1/4 A with a 30 second
on time. The PINK wire is used to modify the Keypad baud rate, par-
ity and mode. This can be accomplished in the field.
Modifying the Baud Rate, Parity and Mode
1. Baud Rate (first digit)
With no voltage applied to the Keypad, connect the PINK wire
to the BLACK wire on the wiring harness. Apply the appropri-
ate voltage to the RED and BLACK wires. You will hear 4 rapid
audible beeps and both the RED and GREEN LED's will flash
at the same rate. Enter the desired first digit on the Keypad to
select the baud rate:
1 = 300
2 = 600
3 = 1200
4 = 2400
Note: All baud rates have a timing error of < 0.2% + Xtal Freq
Error.
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Essex Electronics, Inc. | 805.684.7601 | 800.KEY-LESS | fax 805.684.0232 | keyless.com
5 = 4800
6 = 9600
7 = 19200
8 = 38400
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