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Scanner Commands
As its second primary responsibility, the host issues these types of
scanner commands:
management commands
block-transfer commands
A management command affects the operation of the scanner itself. There
are five management commands:
Command
Set Mode
Autoconfigure
Set Scan List
Get Scan List
Set Fault Dependent Group
The command/confirmation buffers are used to transfer scanner
management commands to the scanner and provide status information to
the host. In addition, this area of the dual-port RAM is used for block
transfers between the host and intelligent I/O devices in the I/O system.
Refer to chapter 4 for information about management commands.
There are two block-transfer (BT) commands:
Command
Host BT Read
Host BT Write
Refer to chapter 5 for information about block transfers.
Chapter 2 describes scanner start-up and shutdown procedures.
Chapter 1
Understanding I/O Scanner Concepts
Action
changes the scanner's operating mode to Program,
Test, or Run mode
goes on the link to see what devices are attached
changes the order in which adapters are scanned,
and their relative frequency
obtains a copy of the current scan list
designates one or more groups of adapters such
that, if one adapter in a group is faulted, the
scanner instructs the others to be faulted also
Action
reads data from an intelligent I/O module and
returns data to the host
writes data supplied by the host into an intelligent
I/O module
1-9
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