Status Commands - Keithley 194 Instruction Manual

IEEE-488 PROGRAMMING
The status command has 12 options, as summarized in
Note that all returned values correspond to programmed
Table 4.21. These command ootions are discussed in the
numeric values. For examole. if the instrument is in the
following paragraphs.
Table 4-21. Status Commands
t - 3xnmand
uo
Ul
u2
U3
u4
US
U6
U?
U8
u9
UK
Ull
u12
Description
Machine status for current channel.
Error status for entire instrument.
Data status for entire instrument.
Value programmed by zero (Z)
command.
Value programmed by delay (W)
command.
Value programmed by number of
samples (N) command.
Value programmed by rate (S)
command.
Not used
Trigger level.
Measurement buffer start pointer.
Measurement buffer end pointer.
Reading buffer start pointer (#readings
in reading buffer).
Translator word list (same as LIST)
Machine Status (UO)
When the command sequence UOX is transmitted to the
Model 194, the instrument will send its machine status
word for the selected channel the next time it is addressed
to talk instead of its normal data string. The status word
will be transmitted only once each time the UO command
is given. To make sure that correct status is transmitted,
this status word should be requested as soon as possible
after the command is sent.
R4 (200V) range, the corresponding byte in the status word
will be an ASCII 4.
The number of the last button pressed is returned as the
H parameter. Button numbers are summarized in Table
4.22.
Table 4-22. Values Returned in UO Status for Last
Button Pressed
I -
Returned
V&le
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Last
Button
Pressed
NOIW
ZERO
FILTER
TRIGGER
SGLKONT
SOURCE
DELAY
SLOPE
LEVEL
SCAN
CPLG
SAMPLES
RATE
LOCAL
CHANNEL
AUTO
SHIFT
RECALL
STATUS
Returned
Vahe
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Button
Pressed
ENTER
CANCEL
FREQiTIME
7
4
1
8
5
2
9
6
3
0
*
MHz
37 kHz
38
H2
The format of the UO machine status word is shown in
Figure 4-9. The default values in the status word (upon
power up or after a DCL or SDC command) are also shown
in Figure 4.9.
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