PD154 & PD158 Vigilante
®
II Annunciators
Instruction Manual
17
External Input Types
The external Silence (SIL), Acknowledge (ACK), and Reset (RST)
inputs may be: contacts (i.e. pushbuttons, relay contacts, etc), open
collector inputs (OC), or TTL signals. However, throughout this manual,
the term “pushbutton” is used to describe these external inputs. Please
refer to the chart below for signal logic.
External Input Type
Active When
Switch/Contact Closed
Open Collector (OC)
On
TTL Low
External Pushbutton Connections
The front panel pushbuttons may also be triggered with pushbuttons
connected to the signal connector terminals shown in Figure 2. Switch
SIL to common for the silence pushbutton, ACK to common for the
acknowledge pushbutton, and RST to common for the reset pushbutton.
The following figure shows external pushbutton wiring connections. Do
not wire-short the external pushbutton contacts to common.
INPUT CONNECTOR
SIL
RST
ACK
COM
Push-
Buttons
Figure 9. External Pushbutton Connections
Multiple Unit First-Out Indication Connections
Multiple PD158 and PD154 units can keep a single first-out channel
indicated for all connected units. An unlimited number of units may be
connected. It is recommended that all units follow the same sequence.
The following figure shows shared first-out indication wiring connections
for 3 units. Up to 200 units may be connected for first-out indication.
