Applies To:
  • CitectSCADA 4.xx, 5.xx
Summary:
The driver may enter a state where it no longer issues requests to the logger device under conditions where it receives partial packets or if there are occasionally very long response times (several seconds) over the comms network.
 

Solution:
CIT has confirmed this to be a problem in the DATATAKR driver. This problem has been fixed in version 2.02.00 of the driver.

In addition, an optional time offset parameter has been added to the IO Devices address field, to permit the staggering of requests. This can help spread the communications load and may be useful for radio modem communications. The parameter is listed below, along with the other parameters used in the IO Devices address field.

Sn:Tt:Ww:Dd:Oo

n is the decimal station id number. This number is used to make reference to the appropriate poll table entry within the ini file
t is poll time should end with either S, M or H for seconds, minutes or hours.
w is the write timeout. A poll will occur at the next poll period or at this time period after a write of data. (The lower of the two values is used to obtain the next poll period).
d is dial up number. This should include any codes required by the Hayes compatible modem (eg. ATDT).
o is poll time offset should end with either S, M or H for seconds, minutes or hours. This is the time offset after startup that the first poll will be made.
 
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