INSTALLATION AND OPERATION
2-57.
MONITOR
COMMANDS
The Generator monitor commands
are intended for troubleshooting and maintenance
procedures. They allow the instrument
hardware
to be programmed to states not
normally possible with the regular
programming
commands.
CAUTION
The
output
of
the Generator Is not guaranteed If the
Generator
hardware has
been changed with these monitor commands.
There are three types of monitor
commands:
Input/ Output, Read/ Write, and Hardware
Control. Table 2-15
lists the
Input/Output types of monitor commands- Table
2-16
lists
the
Read/ Write
types of monitor commands. Table
2-17
lists the Hardware
Control types
of monitor commands.
2-58.
SRQ COMMANDS
The
Generator
asserts the SRQ bus management line on the
IEEE-488
interface bus
whenever the Generator requires service. The
Controller
can then perform a serial poll to
determine the need for service. The set
mask
command is used to designate those needs
that require service. The
SRQ commands
are as follows:
‘‘SM” Set SRQ
Mask
“IM”
Interrogate SRQ Mask
“XF” Local
Operation Alert Mode
The SRQ mask is set to the sum of the reason
values
listed in Table
2-18.
These reason
values correspond to the allowable
reasons that will be requiring service. The
SRQ
Mask
is
set
by
the
following
command sequence:
*‘SM" Sum of Reasons
The Generator asserts SRQ when one of the allowed
reasons
becomes true. The serial poll
response is the sum of those values for
reasons
that are currently true, independent of the
setting of the
SRQ mask.
For
example, if the rejected entry SRQ
is
enabled with
“SM2”
and
a
rejected
entry occurs, the serial poll response will
indicate
that the Generator
generated the SRQ (value of
64)
and that a
rejected
entry occurred (value of
2).
In
addition, other values may be set. The default
SRQ
mask is 192.
The “IM” command interrogates the current
SRQ mask, and an integer is returned.
The “XF” command enables
a mode that causes an SRQ to
be
generated any time the
Generator
processes
an entry. In this mode, a front panel
SRQ is generated (i.e., the serial
poll response indicates that a front panel SRQ
is
the cause of the SRQ), This mode is
enabled and disabled with its own command,
not
through the Set SRQ Mask commands
(as are all other SRQs). The Alert Mode
is enabled/
disabled as follows:
“XFO”
=
Alert Mode off, “XFT’
=
Alert
Mode on.
2-59.
TRIGGER
COMMANDS
The
Generator has the ability to preprogram a command
string of arbitrary Generator
programming commands. This
command string is executed whenever the trigger
command “TR”
or the IEEE^88 group execute trigger
interface message (GET) is
received. This method of programming
the
Generator can be used when a long string of
commands is to
be
sent
to
the
Generator over and over. The programming time is
shortened
by
the
time required to transmit the string of characters
from the
controller to
the Generator.
2-57
To Next Page
Loading...
