3-CPU3

The Edwards 3-CPU3 is the central processing unit module for EST3 fire alarm and life safety systems, serving as the master controller for chassis-mounted rail modules.
It automatically learns module configurations on power-up, handles inter-module communications via broadcast protocol, and provides network connectivity for multi-node systems up to 64 nodes.
Key Specifications
Feature
Specification
Mounting
First two slots of 3-CHAS7 rail chassis ​
Voltage
24 VDC ​
Current
145 mA standby / 155 mA alarm ​
Relays
3 × Form-C (30 VDC @ 1 A): alarm, supervisory, trouble ​
Communication
RS-485 (network), RS-232 (maintenance) ​
Memory
Non-volatile, 1,000 history events ​
Features
Auto module learning, firmware upgrades, ground fault detection, watchdog supervision ​
Temp/Humidity
32°F-120°F (0°C-49°C); 93% RH non-condensing