Campbell SAT ARGOS Manual do Utilizador descarregar pdf (Página 168)

ZENO

-3200 USER MANUAL

Coastal Environmental Systems (206) 682-6048

Page 160

atttn<CR><LF> where ttt is the time in seconds required to make the measurement and n is the

number of values that will be collected.

 The ZENO

-3200 waits for the time specified by the SDI-12 Sensor.

 Once the waiting is complete, the ZENO

-3200 sends one or more aDx! commands to recover the

measured data where x begins with 0 and increments by one for each successive command required

to recover all of the measured data. A data message sent by SDI-12 Sensor with address 0 in

response might look like 0+1.1-4.5+6+7.7<CR><LF>. Each + or - sign delimits the data

fields.

Continuous SDI-12 Sensor Specifics

A Continuous SDI-12 Sensor operates very similarly to a regular SDI-12 Sensor. The difference is that

the continuous SDI-12 Sensor is continually taking measurements. No aM! command is required.

Instead, a series of aRx! commands are sent to recover the data similar to the aDx! commands sent for

regular SDI-12 Sensors.

Concurrent SDI-12 Sensor Specifics

The Concurrent SDI-12 Sensor type operates quite differently from any other serial sensor type because,

as the name implies, it allows data collection from up to four Concurrent SDI-12 Sensors simultaneously.

The setting of Line Items #10 and #17 in the Sensor Menu are different from the standard and Continuous

SDI-12 Sensor types:

 Line Item #10: since up to four Concurrent SDI-12 Sensors can be specified, the Sensor Sample

Count must contain the sum total of the number of data fields reported by up to all four sensors. For

example, data will be collected from three Concurrent SDI-12 Sensors that report 5, 8 and 7 data

fields respectively. The total number of data fields from all three sensors is 5 + 8 + 7 or 20 data

fields. Line Item #10 must be set to 20 by typing the command C10/20{ENTER}.

 Line Item #17: similarly, up to four, single-digit SDI-12 addresses can be specified. No delimiting is

used. For example, data will be collected from three Concurrent SDI-12 Sensors whose addresses are

1, 4 and 7. Line Item #17 must be set to 147 by typing the command C17/147{ENTER}. The

ZENO

-3200 will interpret each character as individual Concurrent SDI-12 Sensor addresses.

When the ZENO

-3200 is ready to collect data from the multiple Concurrent SDI-12 Sensors, the

following steps will occur:

 The ZENO

-3200 will issue an aC! (start concurrent measurement) command for each configured

Concurrent SDI-12 Sensor, where a is the concurrent SDI-12 sensor address. Each sensor should

respond with the message atttnn<CR><LF> where ttt is the time in seconds required to make

the measurement and nn is the number of values that will be collected.

 The ZENO

-3200 will collect the data from each configured sensor in ascending order based upon

each sensor's required time to complete a measurement; i.e., the sensor that requires the least amount

of time to complete a measurement will have its data collected first, and so on. To collect the data,

the ZENO

-3200 will send one or more aDx! commands where x begins with 0 and increments by

one for each successive command required to recover all of the measured data for that sensor. A data

message sent in response by a Concurrent SDI-12 Sensor with address 0 might look like 0+1.1-

4.5+6+7.7<CR><LF>. Each + or - sign delimits the data fields. This process will be repeated for

each Concurrent SDI-12 Sensor as its data becomes available.

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