The function ReadAllPoints (_ReadAllPoints@4 in the Stdcall
call convention) is optional, but its use is recommended. The function is called periodically
according to the station polling parameter "Period".
The task of the function is to get the new value of all I/O tags of given
station. A station status is set according to the return code.
Request has been executed OK.
An error occurred (the device does not communicate or is
out of service, or there is any
error), the station transits into the status COM_ERR or HARD_ERR after
return from the function.
The function was ignored and the station status is not changed.