Specifications

Alto 818 Installation and Operation
2-18 P/N 66109074001 Rev. D
2.4.1 LATCHED CONTACTS AND INDICATOR
The annuciator has one set of latched alarm contacts (L-ALARM) and an associated indicator
light. The Alto 818 can be programmed to cause these contacts to close and to turn on the latch
alarm indicator lamp when a specified abnormal condition is detected by the ACU. Once latched,
these contacts will stay latched and the indicator light will stay on until the annuciator receives
the SILENCE command from the Alto 818 to unlatch them. These contacts will also unlatch if
the system power is recycled or if the system is reset either by use of the Alto 818 reset switch
or by use of the RESET command. The latched alarm contacts are typically used to activate an
audible alarm device.
2.4.2 CONTROL CONTACTS AND INDICATORS
When the Alto 818 detects an abnormal condition, it can provide a printed message at the
terminal port. However, additional abnormal condition warnings or actions can be initiated
through the use of the control contacts, relay outputs. The annuciator module has eight sets of
normally open (N/O) control contacts with associated indicator lights that show the status of each
set of contacts. Devices connected to these contacts can be activated by any of the log events
defined with the REPORT command. The control contacts are rated for 120 V, 300 mA.
For most log events set up to actuate a set of these contacts, the contacts will stay closed and
their indicators will stay lit until either the abnormal condition that caused them to close is resolved
or the SHUNT command is used to bypass the monitor output. However, when contacts are
configured to actuate on a software-controlled log events such as ACCESS GRANTED or
ACCESS DENIED, the contacts close for only two seconds.
2.4.3 STATION SWITCH AND INDICATORS
The annuciator has a three-position toggle switch for changing the building mode. The three
positions are: NIGHT (closed mode), NORMAL (open mode) and FN - FORCED NIGHT (limited
mode). The associated LED will illuminate when a request has been made to put the Alto 818
in the limited or closed mode . This switch is activated from a remote station. In the limited mode,
the indicator light on the annuciator will blink on and off. In the closed mode, the indicator light
will be on continuously. In the open mode, the indicator light will be out.