Kramer SL-280/110V 32–Port S1 Smart Master / Room Controller

Product Overview

The Kramer SL-280 is a 32-port rack-mount master room controller — the Kramer Control brain — providing 8 bidirectional RS-232, 8 IR outputs, 8 GPI/O, and 8 relay ports for comprehensive AV and building system control in commercial, education, and government spaces. IT managers and AV integrators deploy the SL-280 as the central intelligence of a Kramer Control-based room automation system, managing displays, projectors, scalers, amplifiers, shading, lighting, and access control from a single 1U appliance. Its 1GHz processor and scalable I/O architecture support everything from a single conference room to multi-room campus deployments, with expansion possible via Ethernet-connected Kramer control gateways. The SL-280 is programmed and managed through Kramer Control's browser-based, no-code interface.

Product Description

The SL-280 operates as a Kramer Control space controller, running room logic locally while communicating with Kramer Control's cloud or on-premises management platform for remote monitoring, programming updates, and system health visibility. Eight bidirectional RS-232 ports on 3-pin terminal blocks allow two-way serial communication with displays, processors, and AV devices supporting serial control protocols. Eight IR emitter outputs and a built-in IR receiver for command learning provide IR control of displays, projectors, and consumer AV devices. Eight GPI/O ports support sensors, door locks, occupancy detectors, and lighting control interfaces, configurable per port as digital input, digital output, or analog input. Eight relay ports on 2-pin terminal blocks handle contact-closure devices such as projection screens, motorized shading, blinds, and door locks. A single Ethernet port provides network connectivity for Kramer Control communication and IP-based device control. The micro-USB port supports firmware upgrades and direct API command transmission for commissioning and diagnostics. LED indicators on each port provide at-a-glance status for all I/O connections during installation and troubleshooting. The standard 1U 19-inch form factor with included rack ears installs cleanly in central AV equipment rooms alongside matrix switchers, audio processors, and network equipment.

Key Features

• 8 Bidirectional RS-232 Ports — 3-pin terminal block connections for two-way serial control of displays, processors, and AV devices.
• 8 IR Emitter Outputs + 1 IR Receiver — Controls IR devices throughout the space; built-in IR receiver learns commands from existing remotes.
• 8 GPI/O Ports — Configurable per port as digital input, digital output, or analog input for sensors, occupancy, lighting, and access control.
• 8 Relay Ports — Contact-closure control for projection screens, motorized shading, blinds, and door locks via 2-pin terminal blocks.
• 1GHz Processor, 512MB RAM, 4GB Flash — Handles complex room control logic across multiple devices and automation scenarios.
• Kramer Control Compatible — Serves as the Kramer Control brain for browser-based, no-code room programming and cloud/on-premises management.
• Expandable via Ethernet Gateways — Additional I/O ports added by connecting Kramer Ethernet control gateways to the same network.
• Standard 1U Rack-Mount — 19-inch form factor with included rack ears for AV equipment room installation.
• LED Port Indicators — Visual status for every I/O port and system function for quick diagnostics during setup and operation.

Typical Applications

• Corporate conference room and boardroom AV control systems
• University and campus multi-room classroom automation
• Government and municipal meeting chamber AV control
• House of worship AV and building system control
• Multi-purpose room and training room automation
• Commercial meeting space AV and environment control

Technical Specifications

Frequently Asked Questions