Technical data

Chapter 4: Installation
Table 4-1. Terminal Block Connection Definitions
Terminal
Block
Symbol Alarm Connections Definitions
Alarm Connections
ALM Alarm connections Alarm Form C relay changes state in Audio Alarm Conditions.
These conditions are: Push-to-talk Button on MIC depressed.
AUX initiated via CC or NAC, and IN1- IN8 inputs present.
Contacts are rated at 24VDC, 2A. Resistive load.
NO Normally open Alarm Relay contact open to Common (COM) in non-alarm
condition.
NC Normally closed Alarm Relay contact closed to Common (COM) in non-alarm
condition.
TB1
Terminal
Block 1
Section 1
COM Common Alarm Relay Common (COM).
System Trouble Connections
TRB System Trouble connections Trouble Form C relay changes state in Trouble Conditions.
Contacts are rated at 24VDC, 2A. Resistive load.
NO Normally open Trouble Relay contact open to Common (COM) when a system
trouble is NOT present.
NC Normally closed Trouble Relay contact closed to Common (COM) when a system
trouble is NOT present.
TB2
Terminal
Block 2
Section 2
COM Common Trouble Relay Common (COM).
AC Trouble Connections
AC TRB AC Trouble connections AC Trouble Form C relay changes state when primary power is
missing or low. Contacts are rated at 24VDC, 2A. Resistive load.
NO Normally open AC Trouble Relay contact open to common (COM) when primary
power is sufficient.
NC Normally closed AC Trouble Relay contact closed to common (COM) when
primary power is sufficient.
TB3
Terminal
Block 3
Section 3
COM Common AC Trouble common (COM).
SP40S Multi-Function Facility Communication System Manual, Revision D
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