DAVIS Alarm Output Module User Manual
LARM
A
ODULE
M
The Alarm Output Module (AOM) enables you to use weather station alarms
or commands from your computer to automatically start or stop external
devices such as indicator lights, audio alarms, sprinkler controllers, relays, or
other low-voltage AC or DC loads. The AOM works with the GroWeather™,
Energy EnviroMonitor™, or the Heath EnviroMonitor™. The
GroWeatherLink
alarm outputs manually (by turning them on or off from the software), though
the software is not required for basic operation.
®
and Energy WeatherLink® also allow you to control two
UTPUT
O
CAUTION:
WHILE WE HAVE MADE EVERY EFFORT TO INSURE THAT THE ALARM OUTPUT MODULE
WILL WORK RELIABLY, YOU SHOULDNOT USE IT IN SITUATIONS INVOLVING POTENTIAL
PROPERTY LOSS OR HAZARDS TO HEALTH OR SAFETY OF PEOPLE OR LIVESTOCK. DAVIS
INSTRUMENTS CANNOT BE HELD LIABLE FOR ANY FAILURE OF THE ALARM OUTPUT
MODULE.
Product #7736
OMPONENTS
C
The AOM includes the following components. Please make sure you have all
listed components before continuing.
Alarm Output Module
✦
Alarm Output Module Cable, 2-foot (0.6 m)
✦
✦
Power Y-Cable
AC-Power Adapter
✦
Two Cable Ties
✦
✦
Three #6 x 1” (25 mm long) Self-Threading Screws
Four Adhesive Pads
✦
OOL AND MATERIALS
T
N
EEDED
You will need some of the following tools and materials.
Relays
✦
Y ou may need to obtain your own r elays in or der to switch equipment at
voltages higher than 28 volts or power levels above 10 Watts or to provide time delays or other logic functions. Application notes discussing
this further are available from Davis Instruments.
Medium Phillips Screwdriver
✦
✦
Small Slotted Screwdriver
Page 2 Alarm Output Module
YPICAL
T
AOM I
NSTALLATIONS
The AOM may be connected to either the sensor interface module or to the
Interface Cable Adapter Module. The two illustrations below show typical
AOM installations.
AOM C
ONNECTED
S
ENSOR
I
TO
NTERFACE
M
ODULE
AOM C
ONNECTED
TO
I
NTERFACE
C
A
DAPTER
M
ODULE
ABLE
Typical AOM Installations Page 3
PENING
O
AND
Remove the cover by pushing down on the tabs at the top until you can remove
the tabs from the slots.
Reattach the cover as shown below . Make sur e the tabs on top of the cover snap
back into their slots, locking the cover in place
LOSING
C
THE
LARM
A
R
EMOVING
THE
O
C
UTPUT
OVER
M
ODULE
R
EATTACHING
Page 4 Alarm Output Module
THE
C
OVER
LARM
A
Circuit Operation
UTPUT
O
The section below provides technical information on the operation of the
Alarm Output Module. Installation instructions appear separately below.
The Console sends to the Sensor Interface Module (SIM) a serial data word
containing one bit for each alarm signal and user- and system-controlled output. From the SIM (or the Interface Cable Adapter Module) this is sent to the
Alarm Output Module. The data are sent twice, once in true form and once
inverted, and are shifted into the AOM’s Input Register.
When the Verify circuit confirms that the correct number of bits has been sent
and that the two data sets match correctly, it generates a LOAD pulse to transfer the data into the Output Register. All 16 bits of this register are available at
terminal strip J3 for selection as outputs. Four of the 16 are jumper-selected by
the user to drive the photo-coupled outputs and appear as contact closures A,
B, C, and D (closure indicated by lighted red LEDs).
Setting the ENABLE switch off causes all contacts to open (the LEDs continue
to indicate the state of the selected alarms).
The LOAD command pulse is sent back to the Console, where “quality of data
transfer” is determined and sent to the Link software. LOAD also flashes the
yellow indicator to show that a good transfer has occurred.
T wo Set/Reset (RS) Flip-flops can be used to latch the four outputs. Latch 1 is SET
by output A and RESET by B. Latch 2 is SET by output C and RESET by D. The
Latch contents are available as output contact closures L1 and L2 (set ON = closed).
The OK circuits check that a good transfer has occurred within the past 10 seconds or so, that the power voltage is good, and that the ENABLE switch is on.
This validity check result is indicated by the green LED and is available as the
OK output contact (OK = closed).
M
ODULE
PERATION
O
AOM C
IRCUIT
D
IAGRAM
Alarm Output Module Operation Page 5
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