Instruction manual

Essex Electronics, Inc. | 805.684.7601 | 800.KEY-LESS | fax [phone] | keyless.com
16
Serial ASCII Keypad Reader
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! Serial ASCII Specifications
Normal Serial and Inverted Serial signals are open collector
outputs 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, parity 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 5 = 4800
2 = 600 6 = 9600
3 = 1200 7 = 19200
4 = 2400 8 = 38400
Note: All baud rates have a timing error of < 0.2% + Xtal Freq
Error.