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the following
statements
into the HP-85 keyboard.
REMOTE 717 (END LINE)
S = SPOLL (717) (END LINE)
DISP S (END LINE)
When
END LINE is pressed
the second
time,
the computer
performs
the serial polling sequence.
When END LINE is press-
ed the third time,
the status
byte value
is displayed
on the
CRT. The status
byte
has a value
of 0 with
this example
because no bits in the byte are set.
4. SPD
(Serial
Poll
Disable)-The
controller
automatically
sends the SPD command
on the bus to end the serial polling
sequence
described
in SPE.
5. UNT (Untalk)-The
controller
sends the UNT command
to
clear the bus of any talkers.
6. UNL (UnlistenI-The
controller
sends the UNL command
to
clear the bus of any listeners.
3.4.3 Addressed
Commands
Each of the addressed
commands
are sent to a specific device
on the bus. Each device is selected
on the basis of its primary
address.
The Model 705 responds
to these commands
only if
the primary
address sent over the bus preceding
these com-
mands is the same as programmed
via front panel Program 3.
All these commands
are implemented
by addressing
the Model
705 to listen.
1. SDC
(Selected
Device
Clear)-The
SDC command
per-
forms the same functions
as the DCL command
except that
only the addressed device responds.
The instrument
returns
to the set conditions
listed in Table 3-6 when responding
to
an SDC command.
The program
memory
is cleared of all
previously
stored data when
a DCL command
is received.
Also, buffer and display
pointers
are set to location
one.
Programming
Example-Using
front
panel controls
select
five channels
and also select the single program
mode.
Enter
the following
statements
into the HP-85:
REMOTE 717 (END LINE)
CLEAR 712 (END LINE)
Note that the instrument
did not respond to the SDC because
the command
was sent with
a primary
address
of 12. Now
enter the following
statement
into the HP-85:
CLEAR 717 (END LINE)
This time the instrument
returns to the power-up
default
con-
ditions.
Note that program
memory
is cleared
of previously
stored data.
2. GET (Group
Execute Trigger)-The
GET command
is sent
to the Model 705 to trigger the instrument.
Using the GET
command
is only one of several methods
that can be used
to start or stop the Model 705 program
operation.
Programming
Example-Type
in the following
statements
into the HP-85:
REMOTE 717 (END LINE)
CLEAR 717 (END LINE)
The Model
705 returns
to the power-up
default
conditions.
Place the instrument
in the continuous
program
mode
and
start on GET trigger
mode with the following
statement:
OUTPUT
717; "P2TW"
(END LINE)
When END LINE is pressed the instrument
is placed in the con-
tinuous
program
mode.
The instrument
may be triggered
tc
start with the following
statement:
TRIGGER 717 (END LINE)
The front panel START/STOP
indicator
will turn on, indicating
the instrument
has been triggered.
To stop the instrument,
enter the following
statements
into the HP-85:
OUTPUT
717; "T3X"
(END LINE)
TRIGGER 717 (END LINE)
When END LINE is pressed the first time the scan sequence
is
stopped.
Outputting
any valid command
while the Model 705
is scanning
stops the scan.
When
END LINE is pressed the second time, the front
panel
START/STOP
LED goes out,
showing
the instrument
has
received the trigger.
NOTE
The Model 705 also responds to GET without
ad-
dressing.
This command
is sent with the follow-
ing HP-85 statement:
TRIGGER 7
Table 3-6. SDC Set Conditions
Parameter
SRQ
Display Mode
Prefix
Trigger
Modes
Program
Alarm Time
l/O Port
EOI
Terminator
Display Channel
Turn off the Alarm Timer.
All channels
open.
Command
MO
DO
GO
T6
QOO~O:OO
0000
KO
v'(LF) = CR LF
Bl
Notes
No SRQ
Channel
Channel
Data transmitted
with prefix.
Start on External.
Step Mode
Disabled
All outputs
low.
EOI is transmitted
on the last byte out.
Channel
1
3-7
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