Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 86)

Chapter
Operating in SVĆSuperset Mode
6
6Ć5
This area: stores the:
length of data byte specifies the amount of data associated with a command or response
Only the lower byte is used. Interpret the length of data based on the context of the
requested command or received confirmation (i.e., number of words for block
transfers and bytes for scanner management requests).
general data area contains input parameters and result data for scanner commands
continuous block transfer
read and write table
each table contains either write or read data for continuous block transfers
The write table has 16 72Ćword buffers; the read table has 32 72Ćword buffers. For more details, see the
CONTINUOUS BT WRITE command on page 6Ć40 or the CONTINUOUS BT READ command on page 6Ć36.
scanner interrupt and VME ID interrupt from the VME master processor to the scanner
The scanner interrupt area and VME ID area can be read anytime without causing an interrupt to the scanner.
It contains 32 words in which the odd (lower byte) only is used; the information is an ASCII character string:
V.M.E.I.D.A.-.B.6.0.0.8.-.S.V.2.R. .x. .y. or V.M.E.I.D.A.-.B.6.0.0.8.-.S.V.1.R. .x. .y.
where .x. .y. are the series and revision levels of the scanner. For example:
V.M.E.I.D.A.-.B.6.0.0.8.-.S.V.2.R. .A. .A. for series A, revision A.
Writing to any byte in this area interrupts the scanner. The scanner then looks at the command byte to
determine which command to execute.
All even bytes have the value 0xFF; all odd bytes without ASCII characters have the value 0x00.
Operating Status Byte
The operating status byte holds scanner status information for the VME
master processor. The scanner updates this byte every time it completes
either a block transfer or a command. The master processor can clear bits
4 and 7; the remaining bits are read only. The structure is as follows:
Figure 6.2
Structure of the operating status byte
7 6 5 4 3 2 1 0
see the following table for descriptions of these bits