Instruction manual
P84577 G
Sheet 11 of 14
6.0 OPERATING INSTRUCTIONS:
Figure 14 shows the SP4-APS PC board layout.
OUT
IN
OUT
IN
OUT
IN
24 VDC
AUDIO
RS-485
ALARM
POWER TROUBLE
Z1
Z2
Z3 Z4
EX1
EX2
IN
CLASS
B
A
SW2
SP4-APS
JP1
NAC
CC
SW1
TB1
TB2
TB7
TB6
TB5
TB4TB3
JP1
Shorted = 70Vrms
Open = 25Vrms
D37
D32
D36
D35
D41
D33
D42
D43
D38
D34
D39
D40
D44
D45
Figure 14:
SP4-APS PC Board Layout
6.1 MODES OF OPERATION:
6.1.1 STANDBY MODE:
Standby mode occurs when the Addressable Paging Splitter is not in ALARM and is not selected for BGM or a
Telephone Page. Standby mode is indicated when only the GREEN power LED indicator is ON.
6.1.2 BACKGROUND MUSIC MODE:
Background Music Mode occurs when the SP4-TZC sends BGM commands to Addressable Paging Splitter
Modules (s) via RS-485 digital control signals. By default, The SP4-TZC selects all available zones on all SP4-
APS for BGM so that each SP4-APS enables its four available audio output zones. Zone specific BGM selection
can be accomplished through the SP4-TZC module using the SP4 Telzone Programmer software. See the SP4-TZC
installation sheet (P84567) for further information.
6.1.3 TELEPHONE PAGING MODE:
Paging Mode occurs when telephone-paging commands are sent from the SP4-TZC to the SP4-APS Splitter(s) via
RS-485 digital control signals (See Figure 13 for location). See the SP4-TZC installation sheet (P84567) for further
information on the RS485 connections. When the addressed SP4-APS receives the paging command, it enables the
selected zones audio output relays to allow audio to pass. The SP4-TZC will send commands to all networked SP4-
APS modules not selected for paging to turn off their audio output zones.
6.1.4 ALARM MODE:
Alarm Mode occurs when an alarm signal initiates the SP40/2 into an alarm condition, or when the SP4-APS
ALARM input or output wiring is in trouble. When the SP4-APS module is in ALARM, it turns on all audio output
zones and ignores any SP4-TZC paging and/or BGM commands. When the SP4-APS is installed with an SP-40/2
it must be set for “CC MODE” (Contact Closure). When the SP4-APS is installed with an Audio Booster product it
must be set for “NAC MODE.” The SP4-APS uses 3.0mA at 24VDC in the NAC mode. See Figure 14 for the
location of the ALARM terminals.