34 NCA-2 Manual — P/N 52482:M5 03/20/2019
Installation Security Tamper Switch
AKS-1B
The AKS-1B kit includes a key switch and hardware for mounting to the ABF-4B. The AKS-1B switch mounts to the ABF-4B trim plate
as shown in Figure 3.16. Plug the switch leads from the AKS-1B into Connector J6 on the NCA-2. When an AKS-1B is installed and
enabled, the key must be inserted and turned for the keypad to be used.
Figure 3.16 Connecting AKS-1B on J6
3.17 Security Tamper Switch
A security tamper switch (STS-1) installed in the cabinet door will indicate a door tamper condition whenever the door is open. If the
NCA-2 indicates a Security alarm, you can acknowledge, silence or reset the condition from the NCA-2.
There are two options regarding the tamper switch:
• If the NCA-2 is in its own cabinet, the tamper switch can be installed on the cabinet and connected directly to the NCA-2.
• If the NCA-2 is mounted in the same cabinet as the control panel, the tamper switch can be connected to the FACP.
3.18 ACS Devices and the NCA-2
The NCA-2 can be used to monitor Annunciator Control System (ACS) modules and can support up to 32 ACS annunciators. ACS
devices use LED arrays to show the status of points or zones within the network monitoring system. Annunciator points are programma-
ble from the NCA-2 interface.
Figure 3.17 NCA-2-to-ACS Connection
Refer to the appropriate ACS manual for EIA-485 circuit ratings and limitations.
nca2_aks-1b.wmf
Installing AKS-1B on J6 and Trim Plate (Rear View)
EIA-485 circuit characteristic
impedance of twisted pair wiring
should be approximately 120 ohms.
NCA-2
TB2 on
ACM-16AT
TB2 on
ACM-32A
TB1 on
ACM-24AT
EIA485SmplNtwrk.wmf
TB7
NOTE: Some ACS devices will have two 2-pin connectors adjacent to each other, one for NCA-2 connections and one for connecting to
the next ACS device.
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