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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

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Command ‘C’— Sub-command Index 00: Configure & Start Multi-Point Calibration

This sub-command has four (4) additional required parameters used to configure and start the

Multi-Point Calibration function.

Command

“C 00 pppp npts ord avg”

‘C’ is the command letter.

‘ 00’ is the sub-command index (ii) for Configure & Start.

‘ pppp’ is a 1-4 hex digit position field (channel selection bit map), that selects

any of the 1-16 (9016) or 1-12 (9021/9022) internal channels to be affected by

the multi-point calibration.

‘ npts’ is the number of unique calibration points (between 1 and 19) to be

supplied during the calibration function.

‘ ord’ is the order of the adjustment fit, which currently must be 1 for a 1st

order linear fit of the calibration data (i.e., a straight line).

‘ avg’ is the number of A/D data samples collected and averaged for each

calibration point supplied (must be a power of 2 in the set 2, 4, 8, 16, or 32)

NOTE: all parameters are separated by a space.

Response

“A”

‘A’ is the acknowledge letter and is returned if all parameters are supplied with

reasonable values. Else, an error (‘N’) response is returned.

Description: Configures and starts the Multi-Point Calibration function. It specifies the

particular channels (pppp) whose offset and span adjustment coefficients will be

replaced when the function is completed. All specified channels must have the

same full-scale pressure range. Modules with more than one range of internal

transducers installed must have channels from each range calibrated separately.

This sub-command immediately alters the module’s normal data acquisition,

processes A/D samples for average count (default = 8, or as per the ‘w10dd’

command), and uses the sub-command’s avg parameter sample count instead. A

larger count (e.g., 32) is encouraged for calibration purposes. The original sample

count will not be restored until the calibration function ends or is aborted (per

other sub-commands described on the following pages).

NOTE: Avoid confusing this Calibrate command ‘C’ (upper case C) with the

Configure/Control Autonomous Host Streams command ‘c’ (lower case c). Like “c,”

but unlike most other module commands, all sub-commands of this command require a

space between the command id (‘C’) and the first parameter (ii).

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Pressure Systems 9022 Bedienungsanleitung Seite 50