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Appendix F: System 500 Systems: ACM-16AT and ACM-32A Only (UL 8th)
F.1 Capabilities
When installed with a System 500, ACM-16AT, ACM-32A and expanders can annunciate the status of initiating and notification circuits,
relays, and several system control functions. Up to 32 devices can be connected to the EIA-485 communications output, all addresses com-
bined, with up to 64 points to an address. Two-way communications can occur with only one annunciator set to address "1"; other devices
must be configured as "Receive Only". Check battery calculation tables for power limitations. Each annunciator LED is automatically
assigned to one and only one system point:
•
Circuits
– IZ-4/IZ-4A/IZ-8 Initiating Device Circuits (alarm and trouble)
– IC-4/ICE-4/ICR-4L Notification Appliance Circuits (activation and trouble)
– CR-4/CRE-4/CR-4L Control Relays (activation and trouble)
– TC-2/TC-4 circuits (activation and trouble)
•
System Controls
– Acknowledge
– Signal Silence
– System Reset
– Activate Notification Circuits 1 and 2, the Remote Signaling Municipal Tie circuit, and the Alarm Relay.
F.2 Connecting EIA-485 Circuit
Communication between the control panel and the Annunciator Control System is accomplished
over a two-wire EIA-485 serial interface. This communication, to include the wiring, is super-
vised by the System 500. Loss of communication results in "System Trouble" and "Module Fail-
ure" indications at the control panel. The EIA-485 circuit that drives the ACS must be connected
to Terminal Block 2 on the control panel (as shown in the accompanying figure.)
•
Power-limited and supervised.
•
6,000 feet maximum distance
(@16 AWG) between the
control panel and the furthest annunciator.
•
Use twisted pair cable with a characteristic impedance of approximately 120 ohms.
•
EIA-485 circuit rated 5.5 VDC max., 60 mA max.
NOTE: "System Trouble" and "Module Failure" will also occur if the normally closed
supervisory path between TB1 Terminals 6 and 7 on the annunciator is opened (or the
jumper has not been installed).
F.3 Providing Power to Annunciators
System 500 panels use the MPS-24B Main Power Supply. Connect the power run for the ACS to MPS-24B TB2 Terminals 1 (+) and 2 (-).
NOTE: Cut JP1 to make this circuit non-resettable. Do not use this connection to simultaneously power four-wire detectors and annunciators.
See the System 500 Manual for location of JP1.
No more than 200 mA current can be drawn from these power-limited terminals in standby or alarm.
The power run to the annunciator does not require a Power Supervision Relay because loss of power is inherently supervised through a Com-
munications loss. This 24 VDC output is filtered, regulated, power-limited, and non-resettable.
When not using the trouble input on annunciator or expander, jumper terminals TB1-6 and TB1- 7 together.
44
( - ) Common
TB2-2
MPS-24B (Shown as Mounted in System 500)
24 VDC Power (+)
TB2-1
ACS Manual — P/N 15842:N3 5/4/2022
TB2 on main board
of System 500
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