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4.5.2
Listen
and
Talk Address
Commands
4.5. 2.1
The
counter responds
to
address
messages
defined
by
the
programmed GPIB
address
set
from
the rear panel.
Refer back
to
Table
4.2
as required for a
listing
of the 31
talk
and
31
listen
addresses.
The
1994
will
respond
to
talk
and
listen
address
messages
regardless
of
its
addressed
state.
4.5. 2.2
Listen
Addresses
4.5.
2.
2.1
Receipt by
the
counter
of a
listen
address
makes
it
a
listener.
If
previously
addressed
to talk,
the
counter ceases
to
be a
talker.
In in
Local
mode,
the
counter reverts
to
its
Remote
state,
provided the
REN
message
is
true.
4.5. 2.3
Talk Addresses
4. 5.
2.
3.1
Receipt by
the
counter
of a talk
address
makes
it
a
talker.
If
previously
addressed
to listen,
the counter ceases
to
be
a
listener.
If
in
Local mode,
the
counter
will
remain under
local control.
4.5. 2.4
Talk Addresses
-
Other Devices
4.5.
2.
4.1
If
the
counter
was
previously
addressed
to
talk,
then receives the
talk
address
of
another bus device, the
1994 ceases
to
be
a
talker.
4.5.3
Addressed and
Universal
Commands
4.5. 3.1
Table
4.3
lists
the Addressed and Universal
commands
to
which
the
1994
responds.
These
interface
commands
are
recognized because they
are sent
with the
ATN
message
as
true.
The
following paragraphs describe the counter's response
to
each
of these
commands.
Table
4.3
-
Addressed and
Universal
Commands
Message
Meaning
Hex
Code
Decimal
Equivalent
Dal
t
a
Line
Code
B
6
5
4
3
2
sn
GTL
Go
To
Local
01
1
0
0
0
0
0
0
B
SDC
Selected
Device
Clear
04
4
D
0
0
0
1
0
0
GET
Group Execute
Trigger
08
8
0
0
0
1
0
0
0
LLO
Local
Lock Out
11
17
0
0
1
0
0
0
n
DCL
Device Clear
14
10
0
0
1
0
H
0
0
SPE
Serial Poll
Enable
18
24
0
0
1
1
0
0
0
SPD
Serial Poll
Disable
19
25
0
0
1
H
0
0
1
UNL
Unlisten
3F
63
0
El
1
D
El
1
1
UNT
Untalk
5F
9
1
0
1
D
1
1
1
£-1
H
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