3-RS485B | Edwards EST3 Network Communications Card, Class A/B Network & Class B Audio

Edwards · Industrial Automation & Electrical

Description  The Edwards 3-RS485B is a network communications card designed for EST3 fire alarm and emergency communication systems. It provides Class A or Class B circuits for network communications and an additional Class B circuit for digitized audio signals. The 3-RS485B mounts directly to the 3-CPU1 and retransmits network messages to extend wire run distances and ensure reliable inter-panel communication.     Technical Specifications  Condition New/Never Used Surplus Brand Edwards Category Computer Part Number 3-RS485B Subcategory Communication Card Mounting Directly on 3-CPU1 Voltage 24 VDC Current (Standby) 98 mA Current (Alarm) 98 mA Network Configuration Class A (Style 6) or Class B (Style 4) Audio Configuration Class B (Style 4) Isolation (Network) Port A not isolated, Port B isolated Isolation (Audio) AIN/A BIN isolated, AOUT/BOUT not isolated Maximum Wire Size 18 AWG (0.75 mm²) minimum twisted pair Maximum Circuit Length 5,000 ft (1,524 m) between any three panels Circuit Resistance 90 Ω maximum Circuit Capacitance 0.3 µF max (network), 0.09 µF max (audio) Nodes Supported Up to 64 panels Media Options Copper or fiber with 3-FIBMB Operating Temperature 32°F to 120°F (0°C to 49°C) Humidity 0–93% non-condensing Application Network and audio communication in EST3 systems Weight 0.25 lbs     Information About 3-RS485B The 3-RS485B is part of the Edwards EST3 network communication family, enabling secure data and audio transfer between fire alarm control panels. Unlike the 3-RS485A, which offers two Class A audio circuits, the 3-RS485B provides one Class B audio circuit for system integration flexibility. The module supports up to 64 nodes across copper or fiber cabling, with the 3-FIBMB used for fiber communication. Fail-safe circuitry ensures continuous operation by automatically connecting input and output ports if the card or CPU fails, preserving critical communication pathways. Key Features: Network Communications Interface: Provides connectivity between EST3 network nodes. Class A/B Network Support: Configurable for Class A (Style 6) or Class B (Style 4) circuits. Audio Circuit: One Class B digitized audio circuit for message and paging distribution. Message Re-Transmission: Extends circuit length by forwarding network signals to the next node. Extended Network Reach: Supports up to 64 nodes and long wiring runs across large facilities. Fail-Safe Protection: Direct-connect ports maintain communication if the card or CPU fails. Fiber Compatible: Works with the 3-FIBMB for fiber optic media connections. Compact Mounting: Installs directly onto the 3-CPU1 processor module. Electrical Supervision: Provides isolated and non-isolated network/audio port configurations. Reliable Performance: Designed for life safety applications requiring uninterrupted communication. The 3-RS485B delivers the reliability and fault tolerance required for network and audio communication in Edwards EST3 systems.

Brand: Edwards · Category: Industrial Automation & Electrical

Key features

• Network Communications Interface: Provides connectivity between EST3 network nodes.
• Class A/B Network Support: Configurable for Class A (Style 6) or Class B (Style 4) circuits.
• Audio Circuit: One Class B digitized audio circuit for message and paging distribution.
• Message Re-Transmission: Extends circuit length by forwarding network signals to the next node.
• Extended Network Reach: Supports up to 64 nodes and long wiring runs across large facilities.
• Fail-Safe Protection: Direct-connect ports maintain communication if the card or CPU fails.
• Fiber Compatible: Works with the 3-FIBMB for fiber optic media connections.
• Compact Mounting: Installs directly onto the 3-CPU1 processor module.
• Electrical Supervision: Provides isolated and non-isolated network/audio port configurations.
• Reliable Performance: Designed for life safety applications requiring uninterrupted communication.

Specifications

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