Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 109)

Chapter
Operating in SVĆSuperset Mode
6
6Ć28
BT READ transfers a block of data from specified I/O module into the
scanner. The scanner queues at most one block-transfer request – write
or read.
In SV-superset mode, each scanner channel can queue only one
block-transfer request. If you need to send multiple block-transfer
requests, use the continuous block-transfer commands. See pages 6-40
and 6-36.
Upon issuing a block-transfer request, the scanner writes 0x2F in the
confirmation status byte to indicate that the scanner accepted the request
and put it into its queue. When the scanner actually completes the
block-transfer, the scanner sets the semaphore and then it updates this data
in the following order:
1. address
2. block transfer tag
3. length of data
4. confirmation status
5. block transfer read data
6. command complete interrupt (if enabled)
BT READ
command byte 01
description