Fire-Lite ACM-32AF Annunciator Modules - Manual (Page 20)

3. Design Considerations Receive Only and Transmit/Receive
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ACM-16ATF/ACM-32AF Manual PN 51480:A0 02/02/01
Receive Only and Transmit/Receive
For redundant annunciation of system points, annunciators can be
configured as “Receive Only” annunciators. Receive Only annunciators
must be set to the same address as the annunciators they duplicate. Receive
Only annunciators intercept information being transmitted to a
“Receive/Transmit” annunciator for duplication at an intermediate display
location. When configured for Receive Only operation, they cannot be used
to send information to the system, and as a result are not supervised by the
control panel. They cannot perform remote functions such as Acknowledge,
Silence, or Reset. Control switches on Receive Only annunciators can be
used only for local functions, such as Lamp Test. Wiring to Receive Only
annunciators may be supervised by installing the modules “upstream” of
fully supervised, Receive/Transmit annunciators along the EIA-485 line.
Annunciators that are configured to serve as full function annunciators can
both receive status information as well as transmit commands to the control
panel. This allows the annunciator to remotely execute functions of the
control panel in addition to displaying the status of the system.
Figure 2 Receive/Transmit Annunciator Diagram
Fire Alarm
Control Panel
Annunciator Expander
Two-wire
EIA-485
Circuit
“Receive Only” Annunciator set to
address “X” and installed upstream.
Full Function “Receive/Transmit”
Annunciator set to address “X”.
Annunciator Expander
A
C
S
f-
R
Tan
nun.cd
r