ProSoft Technology PS-QS-1x10-0781 - Manual (Page 23)

FieldServer Configuration Manual Page 23 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]
5.2 Function Moves – Type Casting
It is often necessary to manipulate incoming data to create the necessary outgoing data by either joining smaller
data types to create a larger data type, or splitting larger data types to deliver smaller data types. An example of
this is Modbus, where two 16 bit registers are used to transfer a 32 bit floating point value. Upon receipt of these
two registers, the FieldServer needs to join the integers to extract the floating point value. The Type Casting
moves described below perform these kinds of operations
5.2.1 Functions Available For Type Casting:

Join_Float , Split_Float

Join_Int16, Split_Int16

Join_Int32, Split_Int32

Swapped versions of the above (Big Endian vs Little Endian)

Bit_Extract, Bit_Pack, Bit_Move
The following legacy functions have been replaced by the functions listed above. They are simply presented in the
table below for reverse compatibility.
Old Keyword New Keyword Function Performed
Int32 Join
2.i16-1.i32 Join_Int32_Swapped source bytes: [ab][cd] target bytes: [abcd}
2.i16-1.i32-sw Join _Int32 source bytes: [ab][cd] target bytes: [cdab]
2.i16-1.i32-m10k Join _M10K Modulo-10 format
Int32 Split
1.i32-2.i16 Split_Int32_Swapped source bytes: [abcd] target bytes: [ab][cd]
1.i32-2.i16-sw Split_Int32 source bytes: [abcd] target bytes: [cd][ab]
Float Join
2.i16-1.float Join _Float_Swapped source bytes: [ab][cd] target bytes: [cdab]
2.i16-1.float-sw Join _Float source bytes: [abcd] target bytes: [ab][cd]
Float Split
1.float-2.i16 Split_Float_Swapped source bytes: [abcd] target bytes: [ab][cd]
1.float-2.i16-sw Split_Float source bytes: [abcd] target bytes: [cd][ab]
Integer Join
2.i8-1.i16 Join_Int16_Swapped source bytes: [a][b] target bytes: [ab]
2.i8-1.16-s Join_Int16 source bytes: [a][b] target bytes: [ba]
Integer Split
1.i16-2.i8 Split_Int16_Swapped source bytes: [ab] target bytes: [a][b]
1.i16-2.i8-s Split_Int16 source bytes: [ab] target bytes: [b][a]
Figure VI – Legacy Functions for Type Casting Moves