CNC_RDPARAM3 | NCDATA

Specify the library handle. See "Library handle" for details.

Specify the parameter number.
See the "PARAMETER MANUAL" of CNC about available parameter number.
It can be got by cnc_rdparanum function and cnc_rdparainfo function.

Specify the axis number.

Specify the data block length(size of IODBPSD structure).

(4+(byte size of parameter)*(number of axis))

In case that the size of parameter is 4 byte, the IODBPSD structure is as follows. In case that its size is 1, 2, or 8 byte, the size of data part per 1 parameter or 1 axis is 1, 2, or 8 byte.

IODBPSD

no axis/1 axis	all axes

n = Maximum controlled axes

The spindle parameters have an axis attribute, and the data for number of spindle are valid.

Specify whether to acquire by a relative axis or an absolute axis at the parameter read.

Pointer to the IODBPSD structure including the parameter. The IODBPSD structure is as follows.

typedef struct realprm {     /* real parameter */
   long prm_val;             /* value of variable */
   long dec_val;             /* number of places of decimals */
} REALPRM;

typedef struct  iodbpsd {
   short datano;               /* parameter number */
   short type;                 /* upper byte:type */
                               /* lower byte:axis */
   union {
      char    cdata;           /* bit/byte parameter */
      short   idata;           /* word parameter */
      long    ldata;           /* 2-word parameter */
      REALPRM rdata;           /* real parameter */
      char    cdatas[MAX_AXIS];/*bit/byte parameter with axis*/
      short   idatas[MAX_AXIS];/* word parameter with axis */
      long    ldatas[MAX_AXIS];/* 2-word parameter with axis */
      REALPRM rdatas[MAX_AXIS];/* real parameter with axis */
   } u;
} IODBPSD ;               /* MAX_AXIS : max. controlled axes */

datano

Parameter number which was read is stored.

type

Attribute of parameter which was read is stored.

Upper byte:type

0	:	bit type
1	:	byte type
2	:	word type
3	:	2-word type
4	:	real type

Lower byte:axis

0	:	no axis
1,..,m	:	1 axis(m=max. controlled axes)
ALL_AXES	:	all axes(ALL_AXES=-1)

rdata, rdatas

Real parameter is stored.
The value of variable is stored in prm_val, and the number of places of decimals is stored in dec_val.

Real parameter = prm_val * 10 ** (-dec_val)

(Example) When the value of real parameter is 12.345, prm_val and dec_val are read as follows.

prm_val = 12345
dec_val = 3