Bosch Rexroth ID 40 Manual page 151

Example:
The high byte of the MDT status register and the MDT data area from addresses
200–399 are read and also applied to the prefetch configuration. This adrset is
automatically read starting with the next MDT.
http://id40-slk/xid/bal-mem?adrset=200.399&prefetch=1
• The prefetch read command can only be sent in the CONNECTED state, otherwise
the prefetch adrset is not entered. The data from the current MDT is returned.
• The prefetch is only activated for the adrset specified in the command string. Any
deviating prefetch settings from a previous command are automatically deleted.
• If the &prefetch parameter is omitted from the read command, the data
is returned, but all prefetch settings are deleted. This also applies to the
&prefetch=0 parameter.
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