Rockwell Automation 6008-SI IBM PC I/O SCNNR 6008-SI - Manual (Page 17)

Chapter 2
I/O Scanner Concepts
2-9
The discrete output module turns on the output. Any external device
attached to the output module then activates.
For timing information, please see Timing of Discrete I/O in chapter 6,
Discrete I/O.
There are two types of scanner commands, block transfers and
management requests. There are two block transfer commands (BT
commands):
block transfer read
block transfer write
A management request affects the operation of the scanner itself. There
are six management requests:
set mode changes the scanner’s operating mode to program, test, or run
mode
autoconfigure goes on the link to see what devices are attached
scan list changes the order in which adapters are scanned, and their
relative frequency
link status asks the scanner to report all information it has about the
adapters that are connected
setup changes the baud rate and connects or disconnects the line
termination resistor
fault dependent group 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
The control/status and general data areas are used to transfer scanner
management commands to the scanner and provide status information to
the host. In addition, this area of the global RAM is used for block
transfers between the host and intelligent I/O devices in the I/O system.
Scanner Commands