NOTE
REN must be true when sending device-
dependent commands to the instrument, or it
will ignore the command and display a bus error
message.
General HP-85 Programming Example-DDevice-
dependent commands may be sent from the HP-65 with the
following statement:
oul-PuT 727; A5
A$ in this case contains the ASCII characters representing the
command string.
General Model 8573 Programming Example-Use the
following general syntax to send device-dependent com-
mands from the IBM-PC:
CALL IBWRT(M617%,CMD5)
Again, CMD$ contains the command letters to program the
instrument. Remember that the modified declaration file must
be loaded and run before using any of the programming ex-
amples.
3.10.1 Execute (Xl
The execute command is implemented by sending an ASCII
“X” over the bus. Its purpose is to direct the Model 617 to ex-
ecute other device-dependent commands such as F (function)
or R (range). Usually, the execute character is the last byte in
the command string (a number of commands may be grouped
together into one string); however, there may be certain cir-
cumstances where it is desirable to send a command string at
one time, and then send the execute character later on. Com-
mand strings sent without the execute character will be stored
within an internal command buffer for later execution. When
the X character is finally transmitted, the stored commands
will be executed, assuming that all commands in the previous
string were valid.
HP-85 Programming Example-Enter the following
statements into the HP-85 keyboard:
REMOTE 727 (END LINE)
OUTPUT 727;“X” (END LINE)
When the END LINE key is pressed the second time, the X
character will be transmitted to the instrument. No mode
changes will occur with this example because no other com-
mands were sent. Note that the instrument remains in the
listener active state after the command is transmitted.
Modal 8573 Programming Example-Enter the following
statements into the IBM computer:
V%=l:CALL IBSRE(BRDO%,V%) (return)
CMD$=“X”:CALL IBWRT(M617%,CMD$) (return)
When the retmn key is pressed the second time, the X
character is transmitted to the instrument, although no mode
changes occur because no other commands are transmitted.
Note that the instrument remains in the listener idle state after
the command is transmitted because IBWRT automatically
sends UNT (Untalk) and UNL (Unlisten) at the end of the
transmission sequence.
3.10.2 Function IF)
The function command allows you to select the type of
measurement made by the Model 617. The parameter options
associated with the function command set the instrument to
measure voltage, current, resistance, charge, external feed-
back, or V/I ohms. When the instrument responds to a func-
tion command, it will be ready to take a reading once the
front end is set up. The function may be programmed by
sending one of the following commands:
FO=Volts
Fl = Amps
F2 = Ohms
F3 = Coulombs
F4=Extemal Feedback
F5=V/I Ohms
Upon power-up, or after the instrument receives a DCL or
SDC command, the FO (Volts) mode will be enabled.
HP-85 Programming Example-Place the instrument in
the current function with the front panel AMPS button and
enter the following statements into the HP-85 keyboard:
REMOTE 727 (END LINE)
OUTPUT 727;“FOX” (END LINE)
When END LINE is pressed the second time, the instrument
changes to the volts mode, as indicated by the associated
LED.
Model 8573 Programming Example--Place the instru-
ment into the current mode with the front panel AMPS but-
ton. Now type the following statements into the computer
keyboard:
V% =l:CALL lBSRE(BRDO%,V%) (return)
CMD$=“FOX”:CALL IBWRT(M617% ,CMD$) (return)
When the return key is pressed the second time, the instru-
ment changes to the volts function.
3-18
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