Device-Dependent Commands - Keithley 706 Instruction Manual

TRIGGER 718 (END LINE)
After this statement is entered, the front panel
START/STOP LED turns on indicating the instrument has
been triggered. To stop the program operation enter the
following statements into the HP-85.
OUTPUT 718; "T3X" (END LINE)
TRIGGER 718 (END LINE)
Where T3 is the command to set the instrument into the stop
on GET mode. When the END LINE key is pressed after the
OUTPUT 718;"T3X" statement the program operation (scan-
ning sequence) is stopped. When the END LINE key is press-
ed after the TRIGGER 718 statement the START/STOP LED
goes out, indicating the instrument has received the trigger.
NOTE
Sending any valid command during a scanning
sequence STOPS THE SEQUENCE at the
presently displayed channel or crosspoint.
The Model 706 also responds to the GET command without
addressing. This command is sent with the following HP-85
statement:
TRIGGER 7
3. GTL (Go To Local)-The GTL command is used to
remove the instrument from the remote mode. The REN
line MUST BE SET HI (FALSE) in order for the GTL com-
mand to restore operation of the locked out Model 706
restored. Setting the REN line false with the LOCAL 7 state-
ment will also take the instrument out of the remote mode.
3.5 DEVICE-DEPENDENT COMMANDS
The device-dependent commands allow the user to send the
Model 706 commands that perform the same operations as
the front panel controls switches except for POWER
ON/OFF. There are a number of commands that control
parameters which are not available from the front panel and
they are listed in Table 3-6. Each command is entered as an
ASCII character followed by a specific parameter that is sent
over the bus by the controller. The bus treats these com-
mands as data in that the ATN line is high (false) when the
commands are transmitted.
Several commands may be grouped together. Before a com-
mand or command string is executed, the ASCII character X
must be sent. Commands sent without an X (execute) are re-
tained within the command buffer until the execute character
is received.
The condition of the status word within the Model 706 is af-
fected by the device-dependent commands. The status
word may be obtained from the unit by using commands
covered in this section. Refer to paragraph 3.7 for status
word information. Illegal commands do not change the
mode of the Model 706 but the status byte condition
changes as described in paragraph 3.6. Normal Model 706
commands are covered in the following paragraphs. All the
device dependent commands for the Model 706 are listed in
Table 3-7.
front panel controls.
&TL Programming Example-To illustrate this example
the Model 706 must first be placed in the remote and lockout
modes. To do this enter the following statements into the
HP-85:
The Model 706 executes the programmed commands in the
order listed in Table 3-8. This means that if a statement is
entered into the HP-85 as follows:
OUTPUT 718; "PlW345DlX" (END- LINE)
REMOTE 718 (END LINE)
LOCAL LOCKOUT 7 (END LINE)
When the END LINE key is pressed after the LOCAL
LOCKOUT 7 statement the Model 706 front panel controls
are locked out. Check to see that the REMOTE LED is on and
the front panel controls are locked out. The GTL command
sequence is automatically sent by the HP-85 statement with
the following statement:
LOCAL 718 (END LINE)
The Model 706 executes the commands in the following
order according to Table 3-8.
1. Displays interval time (Dl).
2. Selects single scan mode (Pll.
3. Programs interval time for 3.5 seconds (W3.5).
There are three types of commands that make up the device-
dependent commands listed in Table 3-8. They are as
follows:
1. Independent Commands-Commands that do not interact
with each other.
Note, that the REMOTE LED on the front panel turns off, but
the front panel controls are still locked out. Front panel con-
trol can now be restored by setting the REN line false with the
following statement:
LOCAL 7 (END LINE)
2. Timer Commands-Commands that control the time and
date.
3. Channel Commands-Commands that directly affect the
channels.
After executing this statement, front panel control is