ProSoft Technology PS-QS-1x10-0781 - Manual (Page 42)

FieldServer Configuration Manual Page 42 of 90
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262-2299 Fax: (408) 262-2269 Toll Free: (888) 509-1970 email: [email protected]
5.6.9 Example 6 – Load a Value – Strings (2)
Data_Arrays
Data_Array_Name , Data_Format , Data_Array_Length
DA_1
, Uint32 , 20
Preloads
Data_Array_Name , Preload_Data_Value , Preload_Data_Format , Preload_Data_Index
DA_1
, ABCD , String , 0
The value found in the 1st element of the Data Array will be 0x4241 (Ascii value of A) and the value found in the
2nd element will be 0x4443 (Ascii value of B). A UINT32 Data Array can store 2 characters per element.
5.6.10 Example 7 – Load a value - Casting
Data_Arrays
Data_Array_Name , Data_Format , Data_Array_Length
DA_1
, FLOAT , 20
DA_2 , FLOAT , 20
Preloads
Data_Array_Name , Preload_Data_Value , Preload_Data_Format , Preload_Data_Index
DA_1
, 257 , FLOAT , 0
DA_2 , 257 , BYTE , 0
5.6.11 Example 8 – Load an Object name
In the example below a Complex Data Object for Analog Outputs is created with 20 objects. The preload sets the
name of the 1st object (index 0) to the string ‘ABCDEFGHIJKLMNOPQRSTUV’ as well as setting the value of the
Present Value field in the object to zero.
Data_Arrays
Data_Array_Name , Data_Format , Data_Array_Length
DA_1
, AO , 20
Preloads
Data_Array_Name , Preload_Data_Value , Preload_Data_Format , Preload_Data_Index
DA_1 , ABCDEFGHIJKLMNOPQRSTUV , String , 0
The value 257 will be cast to a byte before it is stored. . Only numbers in the range 0-255
inclusive can be stored in a BYTE. The kernel chops off the part of the number that exceeds
the byte and then stores this truncated value in the FLOAT array. Thus the value 257 will be
stored in the 1st element of DA_1 and the value 1 in the 1st element of DA_2.
Both Data Arrays are
formatted as FLOAT and are
therefore capable of storing
the value 257.