Pni RM3100 Sensor Suite Manual de usuario descargar pdf (Pagina 33)

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RM3100 & RM2100 Sensor Suite User Manual Page 32 of 45

There are two types of limits, Absolute and Relative. The LDM bit in the CMM register

establishes which type will be used, where “0” indicates Absolute and “1” indicates

Relative. In Absolute Alarm Mode, the limits are fixed and do not change, while in

Relative Alarm Mode the limits change whenever the current Alarm Limits are exceeded.

As the name suggests, Absolute Alarm Mode is used for monitoring the absolute

magnetic field, while Relative Alarm Mode is used to monitor changes in magnetic field.

Absolute Alarm Mode

In Absolute Alarm Mode the limits are set for each axis by the Alarm Lower Limit

and Alarm Upper Limit registers, as given in Table 5-5. The register values are

unsigned integers. The ALARM bit will go HIGH if the measured value (MX, MY,

or MZ) on any given axis is either greater than the Alarm Upper Limit for that axis or

less than the Alarm Lower Limit for that axis. This is an “OR” function, looking at

both the Alarm Upper and Lower Limits, and looking at all sensors being measured.

Table 5-5: Alarm Lower and Upper Limit Registers

Name

Read

(Hex)

Write

(Hex)

X Axis Alarm Lower Limit - MSB

ALLX2

X Axis Alarm Lower Limit - mid

ALLX1

X Axis Alarm Lower Limit - LSB

ALLX0

X Axis Alarm Upper Limit - MSB

AULX2

X Axis Alarm Upper Limit - mid

AULX1

X Axis Alarm Upper Limit - LSB

AULX0

Y Axis Alarm Lower Limit - MSB

ALLY2

Y Axis Alarm Lower Limit - mid

ALLY1

Y Axis Alarm Lower Limit - LSB

ALLY0

Y Axis Alarm Upper Limit - MSB

AULY2

Y Axis Alarm Upper Limit - mid

AULY1

Y Axis Alarm Upper Limit - LSB

AULY0

Z Axis Alarm Lower Limit - MSB

ALLZ2

Z Axis Alarm Lower Limit - mid

ALLZ1

Z Axis Alarm Lower Limit - LSB

ALLZ0

Z Axis Alarm Upper Limit - MSB

AULZ2

Z Axis Alarm Upper Limit - mid

AULZ1

Z Axis Alarm Upper Limit - LSB

AULZ0

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 43 44

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Pni RM3100 Sensor Suite Manual de usuario Pagina 33

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