In this diagram, your doors are being controlled with proxy readers and/or keypads. Those entry devices are connected to an ECU G3 (Entry Control Unit), which decides whether or not the door should be unlocked after an entry attempt. It also unlocks the door for exiting people when the discrete motion sensor is tripped.
The ECU communicates back to the NetGuardian 832A RTU that is also monitoring equipment alarms and environmetal levels like temperature and humidity. The NetGuardian pushes user profiles into the ECU.
User profiles are originally databased into the system from the central T/Mon master station. The correct profiles for each site are pushed down to the on-site NetGuardian via LAN.
This second diagram shows the same basic architecture in a logical view. Here, one door is controlled by the proxy reader only. The other door has a keypad.
The NetGuardian 832A is large-capacity RTU that monitors 32 discrete alarms and 8 analog alarms, pings 32 network elements, controls 8 relays, provides LAN reach through access to 8 serial ports, and reports via SNMP v2c or DCPX, e-mail, or pagers.
Combining NetGuardians with T/MON enables you to instantly make building access changes across your entire network.
Other BAS Articles and Whitepaper:BAC Index