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MASSA PRODUCTS CORPORATION June 11, 2013

Product Manual 10 M3 Wireless Ultrasonic Level Sensor

8.2.7.2 Response to “Misc Sensor Information” Command #100

In response to Command #100, the sensor returns the Sensor model code, Main firmware version, Ultrasonic firmware version,

followed by the serial number. Here is the format of this message.

Host ID Sensor ID 14 100 model code Main FW Ultrasonic FW serial number checksum

default=251 default=1 (see below) version version 4 bytes

Model Codes: Model M-3/150 = 50, Model M-3/95 = 51, M3/150is = 52, M3/95is = 53, M3/50 = 54

8.2.8.1 Host Command to M3 and Response: Clear Data History Buffer, Command #101

This command clears the Data History Buffer by loading 255 in all 111 RangeMSB locations (see section 6). A ‘255’ is an

indicator that the data record has been cleared or not acquired. As a safety measure, a second ‘Are You Sure’ command from the

host will be required to actually perform the clearing operation. See the sequence below to perform this clear operation.

Host requests to clear the Data History Buffer

Sensor ID Host ID 5 101 checksum

default=1 default=251

‘Are You Sure’ Response from Sensor

Sensor responds with the ‘Acknowledge’ command including the requesting command number

Host ID Sensor ID 6 200 101 checksum

default=251 default=1 Acknowledge

The host then replies back to the Sensor with an ‘Acknowledge’ or ‘Cancel’ command shown below

Acknowledge command

Sensor ID Host ID 6 101 71 checksum

default=1 default=251 Acknowledge GO indicator

The command below can be used (or any other command) to quit the clearing function.

Cancel command

Sensor ID Host ID 6 101 81 checksum

default=1 default=251 Ack. To Quit indicator

Sensor responds with the ‘Acknowledge’ to the GO command after it cleared the history buffer

Host ID Sensor ID 6 200 101 checksum

default=251 default=1 Acknowledge

8.2.9.1 Host Command to M3: Reset Event Counter, Command #102

This command clears the Event Counter register. Here is the format for this message.

Sensor ID Host ID 5 102 checksum

default=1 default=251

8.2.9.2 Response to “Reset Event Counter” Command #102

In response to Command #102, the sensor returns the Acknowledge command after resetting the Event Counter. Here is the

format of this message.

Host ID Sensor ID 6 200 102 checksum

default=251 default=1 Acknowledge

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