Keithley 194 Instruction Manual page 104

IEEE-488 PROGRAMMING
Model 8573 Programming Example-Alter instrument con-
figuration from the factory default value with several front
panel controls and enter the following statement into the
IBM PC keyboard:
When the return key is pressed, the instrument returns
to default conditions.
4.8.8 SDC (Selective Device Clear)
SDC is an addressed command that performs essentially
the same function as the DCL command. However, since
each device must be individually addressed, SDC provides
a method for clearing only a single, selected instrument
instead of clearing all devices simultaneously, as is the case
with DCL. When the Model 194 receives the SDC com-
mand, it will return to the default configuration. The fac-
tory default configuration is shown in Table 4-7 but many
modes except for the primary address may be different if
you change the SETUP 1 (Al) configuration.
To transmit the SDC command, the controller must per-
form the following steps:
1. Set ATN true.
2. Address the Model 194 to listen.
3. Place the SDC command byte on the data bus.
HP-85 Programming Example-Using several front panel
controls, alter instrument modes from the factory default
configuration. Send SDC with the following statement:
When the above statement is executed, the instrument
returns to the default configuration.
Model 8573 Programming Example--Alter instrument con-
figuration with several front panel controls and enter the
following statements into the IBM PC:
When the return key is pressed, the instrument returns
to default configuration.
4.8.7 GET (Group Execute Trigger)
GET may be used to initiate a Model 194 measurement se-
quence if the instrument is placed in the appropriate trig-
ger mode (see paragraph 4.9). Once triggered, the instru-
ment will perform the measurement sequence in accor-
dance with previously selected rate and sample
parameters.
To send GET, the controller must perform the following
sequence:
1. Set ATN low.
2. Address the Model 194 to listen.
3. Place the GET command byte on the data bus.
HP-85 Programming Example-Type in the following
statements to place the instrument in the correct trigger
mode for purposes of this demonstration:
,?EI',OTE ;:'iij's
Now trigger the measurement sequence by sending GET
with the following statement:
"r F: 1: 1: 1; E h: ;7 $3'3
When the END LINE key is pressed, the measurement se-
quence will be triggered.
Model 8573 Programming Example-Type in the follow-
ing statements to place the instrument in the correct trig-
ger mode for this demonstration:
Trigger the measurement sequence by sending GET with
the following statement:
1: $4,. ,... 1 R ,- F: 1; 8:: p, 1, '3 ,:* :.; ::I
The measurement sequence will be triggered when the
above statement is executed.
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