Pressure Systems, Inc. NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com
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CALCULATE AND SET GAINS (Command ‘Z’)
Purpose: Instructs a module t o calculate new gain coeffi cients, with either full-scale pressure
(or a specified pressure) applied to the specified channels. These new coefficients
update part of the module’s internal calibration coefficient database, used to convert
any subsequent raw data (from an y of the specified ch annels) into engineering units
data. The new gain values are also returned in the response. This command is
sometimes called a Span or Span-only calibration.
Command “Zpppp[ vv.vvvv]”
‘Z’ is the command letter
‘pppp’ is the position field
‘ vv.vvvv’ is an [optional] pressure value, preceded by a space character.
Response “g.gggg .. g.gggg”
‘g.gggg’ are the actual gain data values returned, each preceded by a space.
Description: The position field may have 0 or 4 characters. If no position field is specified, gain
coefficients for all module input channels will be calculated and returned. If a
position field is specified, gain coeffi cients fo r only the chan nels whos e bits are set
(=1) will be calculated and returned. If the optional pressure value (vv.vvvv) is
specified, the position field must be 4 character s, even when all c hannels are to be
specified. Gain values are returned in the response in order of highest specified
channel to lowest specified channel, with data formatted per an implied decimal
format (f=0).
Normally this command requires that the exact fu ll scale input pressure be applied
to the affected channels. The optional pressure value [ vv.vvvv] allows the user to
specify any suitable upscale pressure in the current engineering units. For best
results, pressur es in excess of 90% of full scale should be applied. A leading space
character must precede the pressure value parameter.
The desired calibrating pre ssure must be applied to all of the specified channels and
allowed to stabilize before this command is executed. Such a pressure is
presumably generated by a separate model 903x calibrator module or suitable user-
supplied substitute.