File subrequest structure. More...

Public Attributes
int	refType
	Reference type (Must be specified as 6).

int	fileNo
	File number (Range 1-65535). 3 is the input registers file, 4 is the holding registers file.

int	recordNo
	Record Number (Range: 0 - 65535). The first record (aka register) to read from, 0-based numbering.

short *	recordArr
	Pointer to a buffer which will be filled with the data read or contains the data to be sent.

int	recordCnt
	Number of records (aka registers) this buffer holds (Range 1-125).

Detailed Description

File subrequest structure.

A Read or Write File Record function can can read multiple groups of references using subrequests. This struct defines such a subrequest.

Note: The quantity of records to be read, combined with all other fields in the in the expected response, must not exceed the allowable length of 253 bytes.

Public Attributes