Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 76)

Chapter
Operating in SVĆCompatible Mode
5
5Ć25
BT READ transfers a block of data from the specified I/O module into
the scanner.
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)
not used
not used
not used
not used
command
0-64 = number of words to read
from the I/O module
BT read data returned
as many as 64 words
Byte offset
(Hex)
102
104
106
11E
Name
11C
00H = transfer was successful
2FH = block transfer put in queue OK
any other value indicates an error
01H is both sent and returned.
Bit 7 = semaphore
120
channel A
control/status
channel A
general data
-(length-1)
-FBF not used
(length)
108
10A not used
-11B
00-41 = unique number transfer
address of I/O module
not used
not used
semaphore
confirmation
103
105
11D
length of
data
11F
BT tag
address
107
109
BT READ
command byte 01
description