M-GAGE Overview
The M-GAGE Node uses a passive sensing technology to detect large ferrous objects. The sensor measures the change in the
Earth’s natural (ambient) magnetic field caused by the presence of vehicles or other ferromagnetic objects.
When a vehicle is detected, the M-GAGE Node output changes. After the vehicle leaves the desired position, the magnetic field
returns to its natural state and the M-GAGE Node turns off its output signal to the master radio.
Figure 1. Small changes in the ambient magnetic field
Figure 2. Larger changes in the ambient magnetic field
Baseline magnetic field with slight disturbances caused by
permanent ferrous-metal objects within or near the sensor.
After a large object is introduced, the magnetic field changes. The
sensor detects the changes in the field’s strength and orientation
between the ambient field and the field produced by a large metal
object. If the differential is greater than the sensitivity threshold, the
device reports a change of state.
The sensor range depends upon three variables:
•
The local magnetic environment (including nearby ferrous material)
•
The magnetic properties of the object to be sensed
•
Sensor settings
The M-GAGE detects changes in the ambient magnetic field in all directions. As with other sensors, the range depends upon the
target. The strong disturbance of a large ferrous object decreases as distance from the sensor increases; the magnitude and shape
of the disturbance depends upon the object’s shape and content. The sensor can be programmed to react to magnetic field
disturbances of greater or lesser intensity, using three adjustments: baseline, threshold, and hysteresis.
Note:
The sensor continues to sense a vehicle in its sensing field even when the vehicle is stopped.
The placement of the M-GAGE Node is critical for proper operation. Because the M-GAGE sensor detects anomalies in the Earth's
magnetic field in the immediate space around the sensor, it must be placed in a prescribed location to properly detect vehicle
presence.
Before installing the M-GAGE Node in the pavement, bind the Node to its master radio.
For this installation guide, the master
radio is a DXM Controller. The master radio may also be a Performance Gateway.
After the Node is installed, the DXM Controller monitors the M-GAGE Node's output and radio connection. The output of the DXM
Controller can connect to an input (PNP) on any industrial programmable logic controller, industry controllers or visual/audible
indication.
Configuration Instructions
Wake the M-GAGE from Deep Sleep Mode
Because the M-GAGE uses an internal battery, the device ships from the factory in a deep sleep mode. While in deep sleep mode,
the M-GAGE does not attempt to transmit to a parent radio and remains in deep sleep until an LED light at the receiving window
wakes it up.
Follow these instructions to wake the device from deep sleep mode.
M-GAGE Installation Instruction Manual
Original Document
b_51162884 Rev. A
22 February 2022
