312   Clarification on use of CURVE and CSD

Created: 11 Apr 2006

Status: Not Applicable

Part: Part 7-3 (2003)

Links:

Page:

Clause: 7.8.3 and 7.9.4

Paragraph:

Category: Issue for edition 2 of this part

Issue

WG17 would like to use the CURVE and CSD CDCs for Incremental Heat Rate curves and other uses, but it is very unclear how they are expected to be used either singly or with each other.

Proposal

Describe how CURVE and CSD are to be used

Discussion Created Status
29 May 07 Not Applicable
The CDC CURVE is used to select with the attribute setChar one of up to 48 predefined curve shapes. In some cases, in addition, parameters may be changed for the curves. The curve shapes are typically defined with formulas that use up to 6 parameters. Some of these formulas are standardised (value of setCharact between 1 and 16), other formulas may be user defined (value of setCharact between 17 and 32; the specification of the formula is a local issue). In some cases, the curve may be specified as an array of n (x,y) pairs (value of setChar between 33 and 48; the specification of the array of n(x,y) pairs is a local issue; a data of the CDC CSG may be used to specify each of the characteristics 33 to 48). The resulting curve may be read from the device using a dedicated data of the CDC CSD as defined in 7.9.4.

note that the CDC CSG will be defined in Edition 2 in order to support as well the setting of a curve through a number of n(x,y,z) points 		15 Apr 07 Ballot Period

 

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