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Protocol dynamic link library (.DLL) exports a set of functions, which are called by the process D2000 KOM process. The list of all the exported functions is shown in the following table with the brief descriptiona brief description.
On the Linux platform, the dynamic library extension is different (.so), and the function names are without underscore and size specifications (e. g. Init instead of _Init@4).
| Function name | Requirement | Meaning |
|---|---|---|
| _Init@4 | Required | The function is called after DLL dynamic import. |
| _ReadAllPoints@4 | Optional (recommended) | Reading of values of all station I/O tags. |
| _ReadStoredData@28 | Optional | Reading of historical values of station I/O tags. |
| _ReadPointValue@8 | Optional | Reading of I/O tag value. |
| _WritePointValue@16 | Optional | Writing of a new I/O tag value. |
| _InitStation@4 | Optional | Definition of new station parameters. |
| _DeleteStation@4 | Optional | Station deleted. |
| _TimeSynchroStation@4 | Optional | Station real-time synchronisation. |
| _InitPoint@12 | Optional | Definition of new I/O tag parameters. |
| _DeletePoint@4 | Optional | I/O tag deleted. |
| _ConfigDone@4 | Optional | Calling the definitions of the station and its I/O tags |
| are done. | ||
| _PointsApplyBack@8 | Optional | Response to calling the call-back procedure PointsApply. |
| _StationsApplyBack@8 | Optional | Response to calling the call back procedure PointsApply. |
| _ExitProc@0 | Optional | Called when stopping D2000 KOM. |
| _ExitProcWithLnPar@4 | Optional | Called when stopping D2000 KOM. |
| _RdStatusChanged@4 | Optional | Called when switching the redundancy or changing the instance of D2000 KOM between active and passive. Note: the startup parameter /RXN affects the behavior of OEM protocols in redundancy. |
Note
All the used KomAPI functions and procedures (including call-back functions and internal tasks) require the Stdcall call convention on the Windows platform.
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