The SPCM Dynamic Link Library contains all functions to control the whole family of SPC and DPC modules which work on PCI bus. This manual is oriented to the functions which are used to control DPC-230 module. Up to eight DPC modules of the same type can be controlled using the SPCM DLL. The functions work under 32 or 64 bit Windows 10/11. Both 32 and 64-bit DLL versions are available. The program which calls the DLLs must be compiled with the compiler option ‘Structure Alignment’ set to ‘1 Byte’.