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IEC104 - Setting timestamp of transferred value


I'm working on a acquisition system gathering pressure readings. It consists of two parts: FPGA and RT. FPGA is reading data from analog inputs at 1kHz freq, calculates median and downsampling data to 200Hz. Last operation is writing downsampled data to FIFO. RT program is reading FIFO and transmitting data via IEC104 to scada system. Now comes the trouble: IEC104 implementation in LabView doesn't allow me to decide about timestamp of transferred values. Timestamp is added automatically in the moment of transfer (Write function) But this that generates offset between moment of data acquisition on FPGA side and data transfer on RT side. Is there any way to force different timestamp when sending values via IEC104?


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