Massa M3 Manuel d'utilisateur télécharger pdf (Page 17)

MASSA PRODUCTS CORPORATION June 11, 2013

Product Manual 16 M3 Wireless Ultrasonic Level Sensor

9.2.5 Zigbee / Unassociated State Register (addr = 9) (versions 31.x or greater)

The Zigbee / Unassociated State register is used to reboot the sensor if a fault condition has occurred either by Zigbee messages

that are not being acknowledged (by gateway) or if sensor is unassociated with gateway for some other reason. A counter will

increment a fault once every Awake period or it will be cleared if message was acknowledged as delivered. If consecutive faults

occur up to the programmed Zigbee / Unassociated State register value, then the sensor will reboot. This can also be regarded as a

Zigbee watchdog register. Register limits are 0 or 4 – 254 with 0 disabling this feature. Suggested setting for this register is for a

reboot rate every 24 hours. Timing is based on Deep Sleep register, i.e., Deep Sleep = 1 hour, set Zigbee/Unassociated State

9.2.6 User Description Field Register (addr = 32-63)

The User Description Field registers is for the user to store descriptive information. Only one byte ASCII characters (values from

32 through 126) will be accepted in these 32 registers.

9.2.7 Error Indicator Register (addr = 65)

The Error Indicator register will identify multiple sensor faults with 0 representing that the sensor is OK. Status Byte 1, bit 7 in

the Event Data will be set if any bit is set within this Error Indicator register. Below are the fault codes for each bit. Errors are

cleared by sending a zero to this register. If Bit 0 = 1, then this would indicate the sensor had replaced at least one configuration

register to factory default value after it was detected being out of range. Note: Sensor registers cannot be written to until this bit

has been cleared.

Bit 0: Configuration Register value replaced (configuration register out of range, replaced with factory default)

Bit 1: Sensor Detection Fault. Perform Ultrasonic Waveform to verify sensor signals. Consult factory.

Bit 2: Temperature Probe Fault. Consult factory.

Bit 3: Brown Out Fault. Power supply low.

Bit 4: Power Supply Low. Replace batteries

9.2.8 Sensor Threshold Voltage Adjustment Registers (addr = 78-81)

The Sensor Threshold Voltage Adjustment registers allows the user to adjust sensitivity of the sensor’s capturing circuitry. The

settings shown in the table below are used for the long transmit cycle (10 or more cycles) by the sensor to acquire targets further

away which were not detected by the sensor’s initial attempt to acquire targets up close (with 1 cycle transmission). The table in

section 9.1 shows the recommended default values. In application software, the Ultrasonic Waveform and these thresholds can be

superimposed so that the sensor’s sensitivity adjustments can be tailored for the application. Note that there will be pre-

programmed settings named ‘Very-High’, ‘Hi’, ‘Normal-Hi’, ‘Normal’ (default), ‘Low’, and ‘Very-Low’ for these Long Cycle

transmit registers. This will be selected by application software and the selection will be indicated in Status Byte 2 bits 5-7 (see

section 6.1). The threshold index values are listed below. Voltage Thresholds - 0: No switching to occur 1: 0.75V, 2: 0.84V, 3:

0.88V, 4: 0.94V, 5: 1.00V, 6: 1.03V, 7: 1.13V, 8: 1.22V, 9: 1.25V, 10: 1.31V, 11: 1.38V, 12: 1.41V, 13

: 1.50V, 14: 1.59V, 15:

1.63V, 16: 1.69V, 17: 1.75V, 18: 1.78V, 19: 1.88V, 20: 1.97V, 21: 2.06V, 22: 2.16V

9.2.9 Sensor Threshold Time Adjustment Registers (addr = 82-87)

The Sensor Threshold Time Adjustment registers allows the user to adjust the time when the sensor’s capturing circuitry threshold

voltage is to change. The Threshold Switch Time units are 500nS/bit (2uS/bit for M3/50) with the LSB in the lower address and

the MSB in the higher address. If a “Zero” is stored for a Threshold Voltage, then no voltage change will occur and the previous

voltage threshold will remain in effect. Typically the voltage is set higher at the beginning and lowered as time passes.

9.2.10 Outgoing Message Mode # Data Records Register (addr = 101)

The Outgoing Message Mode # Data Records register is used to set the number of Event Data records that will be automatically

sent when sensor is programmed to send upon awake from deep sleep. See section 8.2.1.2 for the outgoing message format. This

9.2.11 Ultrasonic Waveform Cycles Register (addr = 109)

The Ultrasonic Waveform Cycles register selects the number of transmit cycles for the Ultrasonic Waveform routine. Limits are

from 1 to 20 cycles. Typical transmit cycles for the sensor’s operation is 1, 10, or 20 dependant on acquisition of an echo.

Time

Registers

Threshold

Registers

Start initial threshold Threshold Voltage #1 78

Threshold Switch Time 2 82-83 will switch threshold to Threshold Voltage #2 79

Threshold Switch Time 3 84-85 will switch threshold to Threshold Voltage #3 80

Threshold Switch Time 4 86-87 will switch threshold to Threshold Voltage #4 81

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 28 29

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Massa M3 Manuel d'utilisateur Page 17

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