Fluke 6062A - Page 62

Table
2-10.
IEEE-488
Address
Mode Message
Descriptions
(cont)
MESSAGE DESCRIPT ION
GET
Group Execute
Trigger
Trigger
The
GET message
is ignored during
Local operation.
When
Operation
the GET message
is received
(during remote
operation)^
the Generator
executes
a
command
string
that has been
preprogrammed with the
Configure
Trigger command
("CT").
The operation
of the GET message
is identical
to the
operation
of the
Trigger ("TR")
command.
Undefined
IEEE-488
Commands
All
undefined
IEEE-488 commands
are
acknowledged
by
the
Generator handshake
sequence^
but no action
is taken.
2-47.
GOING FROM REMOTE
TO LOCAL
The Generator
switches from remote to local
mode in one of the
following ways: The
IEEE-488
Go To Local (GTL) message is
received, the remote
enable signal REN is
false, or a Return
To
Local (rtl)
message is generated
by
pressing
the front panel
[CLR I LCL] key (if the
Generator
is not in the local lockout
mode).
The Generator enters the local
lockout mode when
the Local Lockout
message (LLO) is
received. The Generator
exits the local lockout
mode to the local
mode when REN is
false.
When switching from
remote to local, unprocessed
commands
in the input buffer
are
processed
until the input buffer is cleared
or a front panel entry
is made. Switching
to local has
no effect on the contents
of the output buffer.
2-48.
Talk-Only
Mode
Figure 2-6
shows two
generators connected
together
with the IEEE-488
Bus.
To select
the talk-only
mode, set
the
TALK
ONLY address
switch
to
1
(up), if
the
TALK-ONLY
address
switch and
the LISTEN-ONLY
address
switch are set
to
1,
the
talk-only
mode is selected.
In
the talk-only
mode, the listener,
remote/local,
service request,
device clear,
and device
trigger interface
functions
do not apply.
If the talk-only
mode is selected,
the Generator
is always addressed
to talk and
the front panel
ADDR
indicator is always
lit. The
Step Up (“SU”) or Step
Down (‘‘SD”)
message is sent
when
the
[f]
STEP
or
[i]
STEP front
panel keys are
pressed. This
output is not
buffered, and if
no
listener is
connected
to the IEEE-488
Interface, no
output will be
sent. A carriage
return
followed
by line feed
(with the EOI
signal true)
are always sent
as the end of record.
2-49.
Listen-Only
Mode
To select the
listen-only mode,
set the LISTEN
ONLY address
switch to I (up). If the
talk-only
address
switch and the
listen-only address
switch are set
to
1,
the talk-only
mode is selected.