Publication 1747-UM013B-EN-P - January 2005
RIO Block Transfer
5-3
The steps below detail a successful Block Transfer Read (BTR).
1.
The M0 file contains BTR control information which controls
(initiates) the scanner BTR operation. (Refer to the Block
Transfer Buffer Layout section for details on control
information.)
2.
The SLC control program initiates a block transfer read by
commanding the scanner to perform the read operation. The
adapter/intelligent I/O module sends BTR data across the RIO
link to the RIO scanner.
3.
The scanner writes the BTR data to a unique M1 file location
that you specify. Also, one byte of the scanner’s I/O image file is
used for “handshake” purposes between the scanner and the
adapter/intelligent I/O module. Note that the SLC control
program must never read or write to this “handshake” image
space.
4.
Using the M1 file and a COP instruction in the control program
the scanner transfers the BTR data to the SLC processor via the
chassis backplane. The M1 file also contains BTR status
information. (See the Block Transfer Buffer Layout section for
details on status information.)
5.
The SLC control program processes the BTR information.
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