The Morley-IAS by Honeywell 795-004-001 RS485 Communication Module (KT Automation reference KTI070010RS485C) is designed as an internal plug-in expansion printed circuit board (PCB) for direct integration into compatible Morley-IAS ZX series intelligent fire alarm control panels. Proper mechanical seating, correct field transmission line wiring, and adherence to environmental parameters are required for reliable network and peripheral bus communications.
Mechanical Mounting & Board Placement
The 795-004-001 communication module features a compact form factor measuring 90 mm (H) x 90 mm (W) x 110 mm (D) with a total physical weight of 35 grams (1 oz). It is engineered for tool-free, direct plug-in connection onto designated expansion headers inside the host panel enclosure.
- Ensure the host fire alarm control panel is completely powered down (both primary mains AC and secondary standby battery supplies disconnected) prior to seating the module.
- Align the module's multi-pin plug-in connectors with the internal expansion card header on the host ZX panel motherboard.
- Firmly press the printed circuit board card into place until securely seated to ensure reliable electrical contact.
- Maintain separation between low-voltage field communication wiring and high-voltage AC mains lines within the panel cabinet.
Power Supply Requirements & Electrical Isolation
The RS485 module does not require a dedicated external auxiliary power supply. All operational voltage is derived directly through the host control panel header interface:
- Operating Voltage: 18 to 28 Vdc (derived directly from the host fire panel).
- Typical Current Consumption: 25 mA at 24 Vdc.
- Isolation: The module provides optically isolated communication ports designed to eliminate electrical ground loops and protect data lines from common-mode electrical interference.
Field Cabling & Transmission Line Specifications
Reliable RS485 transmission requires compliance with established industrial cable specifications and distance limitations. Deviations in cable cross-sectional area or shielding degrade signal integrity across extended multidrop segments.
| Parameter | Specification / Requirement |
|---|---|
| Cable Type | Shielded twisted-pair (STP) cable |
| Minimum Conductor Size | 0.5 mm² cross-sectional area (24 AWG) |
| Maximum Bus Length | Up to 1,200 meters (3,937 feet) per channel |
| Network Topologies | Class-A or Class-B networking; two-wire multidrop bus |
| Port Protection | Integrated optical isolation |
Terminate the cable shield continuously through the network run and ground it at the designated host panel earth terminal according to installation wiring schematics. Avoid tee-taps or star taps on the two-wire multidrop transmission run.
System Networking & Peripheral Bus Configurations
The 795-004-001 card functions in multiple network architectures across intelligent installations:
- Inter-Panel Networking: Connects peer-to-peer control loops between Morley-IAS ZX series panels, including the ZX1e, ZX2e, ZX5e, ZX1Se, ZX2Se, and ZX5Se.
- High-Integrity Loops: Compatible with the Hi-485 conversion module (model 795-038-001, PCB only), which mounts in conjunction with the RS485 card to provide fault-tolerant High Integrity network rings.
- Peripheral Bus Integration: Acts as a dedicated driver port for remote field units, including Morley-IAS Active Repeaters (709-601-001), Passive Repeaters (709-701-001, 709-752), 4-way Relay Cards (795-014), 4-way Sounder Cards (795-015), 8-way Input Cards (795-029), and 40-way Mimic Driver Cards (795-065).
- External Communications: Interfaces directly with Modbus communication converters, pager interface modules, third-party graphic front-end systems (such as VisualeyeZ), dial-up/leased line telephone modems (3178-1090, 3602-1001), and RS485 fibre optic interfaces (3071-0001, 3071-0201).
Commissioning via Panel AUTO-LEARN Facility
Once mechanical installation and line wiring are complete, reapply panel power. Morley-IAS ZX series control panels incorporate an internal AUTO-LEARN commissioning routine. Executing the AUTO-LEARN sequence prompts the panel central processor to automatically identify, interrogate, and register the newly fitted 795-004-001 plug-in module along with any connected peripheral devices on the RS485 communication line, eliminating manual peripheral addressing entry.
Environmental Operating Limits
The 795-004-001 module is designed for indoor deployment within the environmental protection parameters of the host ZX control panel:
- Operating Temperature Range: 0°C to 49°C
- Relative Humidity Range: 10% to 93% non-condensing
- Environmental Directives: RoHS and WEEE compliant
