The Morley-IAS by Honeywell RS485 Communication Module (Part Number 795-004-001) is an internal plug-in serial expansion interface designed specifically for Morley-IAS ZX series multi-protocol intelligent fire alarm control panels. Operating on 18 to 28 Vdc drawn directly from the host control panel with a nominal power draw of 25 mA at 24 Vdc, the module equips panels with optically isolated ports engineered to protect network infrastructure from ground loops, electrical noise, and common-mode transients across industrial and commercial facilities.
Inter-Panel Peer-to-Peer Fire Alarm Networks
In multi-building campuses, manufacturing plants, distribution centres, and multi-tenant facilities, system designers deploy the 795-004-001 module to establish master-to-slave or peer-to-peer data highways between distributed control panels. The module interfaces natively with Morley-IAS ZX1e, ZX2e, ZX5e, ZX1Se, ZX2Se, and ZX5Se intelligent fire alarm control panels.
- Long-Distance Distributed Bus: Accommodates multidrop communications over distances of up to 1,200 meters (3,937 feet) per channel when wired with shielded twisted-pair cable having a minimum conductor cross-sectional area of 0.5 mm² (24 AWG).
- Wiring Topologies: Supports both Class-A (loop) and Class-B (stub/radial) network configurations to maintain communications during single open-circuit faults or line interruptions.
- Noise Suppression: Optical isolation maintains high signal fidelity in electrically harsh environments prone to interference from switchgear, variable frequency drives, or heavy industrial machinery.
Peripheral Bus Deployment for Remote Annunciation and Control
The module functions as a high-integrity RS485 peripheral communication highway within a single panel setup, connecting system controllers to dedicated human-machine interfaces (HMIs) and distributed input/output modules positioned throughout a plant or commercial facility.
- Repeaters and Display Terminals: Communicates directly with Morley-IAS active repeaters (709-601-001) and passive repeaters (709-701-001, 709-752) located at security gatehouses, nurse stations, reception desks, and building entrances.
- Distributed I/O Interfacing: Drives remote plant control cards including 4-way programmable relay cards (795-014) for ventilation or elevator control, 4-way sounder cards (795-015), and 8-way input monitoring cards (795-029).
- Mimic Panels and Loggers: Drives 40-way mimic driver cards (795-065) for custom graphic annunciator panels and serial output connections to external printers for physical incident logging.
Integration with Building Management Systems (BMS) and Graphic Front-Ends
For smart buildings and centralized command hubs, the 795-004-001 card acts as the physical layer linking ZX series panels to supervisory systems. It facilitates protocol communications with external Modbus gateways, on-site paging systems, and third-party graphic management front-ends such as Morley-IAS VisualeyeZ, allowing facility personnel to view floor plans, monitor panel events, and diagnose fault states in real time.
Extended Telemetry, Fibre Optic, and High-Integrity Network Topologies
For specialized safety architectures requiring extended transmission resilience, the module connects to specialized line drivers and conversion adapters:
- High Integrity Loops: Directly pairs with the Morley-IAS Hi-485 conversion module (model 795-038-001) inside the control panel to establish fault-tolerant loops where communications survive partial system damage.
- Fibre Optic Transmission: Interfaces with Morley-IAS RS485 fibre optic converters (models 3071-0001 and 3071-0201) to span extreme campus distances and completely eliminate EMI/RFI interference between distinct facility blocks.
- Remote Telemetry: Links to dedicated RS485 dial-up and leased-line telephone modems (models 3178-1090 and 3602-1001) for off-site station monitoring.
Field commissioning is streamlined through the ZX control panel's native AUTO-LEARN facility, which automatically identifies the plug-in PCB module and registers connected peripheral hardware without manual firmware scripting, operating reliably across an ambient temperature range of 0°C to 49°C and relative humidity of 10% to 93% non-condensing.
