The EAE KMG103 KNX/Modbus Gateway is a multi-function room controller for Guest Room Management Systems (GRMS) in hotels and serviced apartments. It bridges the in-room KNX line to the building Modbus TCP backbone for SCADA and PMS integration — while integrating a KNX power supply, KNXnet/IP tunneling interface, and occupancy-based energy-saving logic that replaces a physical card holder.

By combining PSU, gateway, and energy saver in one DIN-rail module, the KMG103 reduces per-room device count: no separate KNX power supply, no per-room IP router, and no card-holder interface are required in the standard EAE hotel topology. The device connects directly to Modbus TCP on the room network and supports up to 4 simultaneous KNXnet/IP tunneling connections for ETS commissioning and group monitor access.

Key Features — Integrated PSU, Gateway, and GRMS Logic

Connectivity and Power

• KNX ↔ Modbus TCP gateway: Control and monitor in-room KNX devices from SCADA visualization software.
• Integrated KNX PSU: Built-in 320 mA or 640 mA KNX bus power supply — short-circuit and overload protected.
• Direct Modbus TCP: RJ45 connection to the room Modbus TCP line — no separate KNX IP router per room.
• KNXnet/IP tunneling: Up to 4 simultaneous tunneling connections for ETS and remote diagnostics.
• IP configuration: DHCP or manual IP address assignment.

GRMS Energy Saving

• Card-holder-free occupancy logic: Patent-pending controller manages room energy saving without a physical key-card slot.
• Four GRMS scenes: Pre-welcome, welcome, leave, and check-out — configurable via GRMS software.
• 2 dry-contact inputs: Door and window sensing for HVAC interlock (AC reduced or off when window/balcony open).
• Door-lock integration: Compatible with leading door-access systems for occupancy detection.
• Autonomous operation: Scene logic continues even if the central visualization server is unavailable.

At a Glance

Specification	Detail
Product type	KNX PSU + Modbus TCP Gateway + IP Interface + Energy Saver
Primary application	Hotel GRMS and serviced-apartment room control
KNX bus output	30 V DC (with choke) — 320 mA or 640 mA variants
KNX auxiliary output	30 V DC (without choke)
Mains input (220 V variants)	150–275 V AC, 50–60 Hz
Mains input (110 V variants)	85–160 V AC, 50–60 Hz
Ethernet	RJ45, 10/100BaseT — Modbus TCP and KNXnet/IP
Tunneling connections	Up to 4 simultaneous KNXnet/IP clients
Physical inputs	2 dry-contact inputs (door / window)
Dimensions (H × W × D)	66 × 108 × 90 mm (6 MW)

Manufacturer Order Codes

EAE order no.	Description
48192	KMG103 — 220 V, 640 mA (SMP-KMG103-220V-640ma)
48198	KMG103 — 220 V, 320 mA
48193	KMG103 — 110 V, 640 mA
48185	KMG103 — 110 V, 320 mA

Full electrical ratings and classification data are listed under Technical Specifications. Datasheet, product manual, installation manual, KMG Configurator, and certificates are under Downloads.

Applications and KNX Integration

• Hotel guest rooms: Single-module room controller replacing separate PSU, IP router, and card holder — pairs with EAE room actuators such as the EAE RCU0800 Room Control Unit.
• Energy management: Leave and check-out scenes cut lighting, sockets, and HVAC when the room is unoccupied.
• HVAC interlock: Window and balcony contacts via dry inputs reduce or disable AC when openings are detected.
• PMS integration: Check-out scene triggered from hotel property-management software via Modbus TCP.
• Central KNX infrastructure: For non-GRMS projects, supply and segment KNX lines with the EAE PS640 Power Supply, LC200 Line Coupler, or IPR200 IP Router.

Choosing EAE Hotel vs System Devices

The KMG103 is purpose-built for EAE hotel GRMS topologies where Modbus TCP is the room backbone. For standard commercial or residential KNX panels that only need bus power and IP backbone coupling, use a dedicated PS640 Power Supply plus an IPR200 Router or LC200 Coupler instead.