The GMISM Motion Sensor Interface Module is designed to interface motion sensors with GE relay-based lighting control systems. It provides a standardized way to translate signals from occupancy and motion sensors into momentary control inputs that can operate GE relays or associated relay control circuit boards. This allows motion-based lighting control to be implemented without modifying the relay hardware itself.
The GMISM is intended for use in lighting automation and control applications where occupancy detection, manual switching, or building automation system (BAS) signals must interact with GE relays. By acting as an intermediary module, the GMISM simplifies wiring, improves compatibility, and supports consistent control behavior across a wide range of sensor types.
Motion Sensor Compatibility and Control Method
The GMISM is able to work with almost any motion sensor available on the market today. Many motion sensors provide either a dedicated control wire—often referred to as a blue control wire—or an auxiliary relay output that changes state based on detected occupancy. The GMISM is designed to accept these outputs and convert them into a momentary control signal suitable for driving a GE relay input.
This momentary signaling approach aligns with the operating requirements of GE relays, which typically expect a pulse rather than a sustained signal. By generating a clean momentary input, the GMISM ensures reliable relay operation regardless of how long the motion sensor output remains active.
Because motion sensors vary widely in output type, voltage levels, and timing behavior, the GMISM helps isolate the relay system from these differences. This improves overall system reliability and reduces the need for sensor-specific wiring or configuration changes.
Additional Inputs and System Integration
In addition to motion sensor inputs, the GMISM includes connections for a momentary switch. This allows manual control devices such as wall switches or push buttons to operate the same GE relay that is controlled by the motion sensor. Manual and automatic control can therefore coexist within the same lighting control circuit.
The GMISM also supports a dry contact input, making it suitable for integration with building automation systems. BAS controllers often provide dry contact outputs to signal events such as schedules, overrides, or centralized commands. The GMISM allows these signals to be translated into relay control actions without requiring direct electrical compatibility between the BAS controller and the relay.
By supporting motion sensors, manual switches, and BAS dry contacts, the GMISM enables flexible control strategies while maintaining a consistent interface to the GE relay hardware.
Typical Applications and Use Cases
The GMISM is commonly used in commercial and institutional lighting systems where occupancy-based control is required. Examples include offices, classrooms, corridors, storage areas, and other spaces where lights should automatically turn on or off based on presence.
It is also useful in retrofit scenarios where existing motion sensors need to be connected to GE relay panels without replacing sensors or rewiring the relay system. By providing a standardized interface, the GMISM reduces installation time and minimizes disruption to existing infrastructure.
In integrated building systems, the GMISM allows lighting control to respond to multiple sources of input, including sensors and BAS commands, while keeping relay control logic simple and predictable.
FAQ
What does the GMISM do?
It interfaces motion sensors, manual switches, and dry contact signals with GE relays by generating momentary control inputs.
Can it work with different motion sensor brands?
Yes. The GMISM is designed to be compatible with most motion sensors available on the market.
Does it support BAS integration?
Yes. A dry contact input allows signals from building automation systems to control GE relays.
Specifications
Description: Motion Sensor Interface Module
Catalog#: GMISM
Operating
Environment: 0-55 Degrees C (32-131F), 0-95% RH, Non-Condensing, Non Corrosive atmosphere
Power
Requirements: 24 VAC
Dimensions: 5.002” x 3.570” x 1.502”, 127.05mm x 90.68mm x 38.15mm
Weight: 51g / 0.035 oz