Typical Command Sequences - Keithley SourceMeter 2790 Reference Manual

F-12

Typical command sequences

For the various multiline commands, a specific bus sequence must take place to properly
send the command. In particular, the correct listen address must be sent to the instrument
before it will respond to addressed commands.
sending the addressed multiline commands. In this instance, the SDC command is being
sent to the instrument. UNL is generally sent as part of the sequence to ensure that no
other active listeners are present. Note that ATN is true for both the listen command and
the SDC command byte itself.
Table F-3
Typical addressed multiline command sequence
Step
*Assumes primary address = 16.
Table F-4
the instrument is being addressed, but it is set high while sending the common command
string.
Table F-4
Typical addressed common command sequence
Step
*Assumes primary address = 16.
Command
1 UNL Set low
2 LAG* Stays low
3 SDC Stays low
4 Returns high
gives a typical common command sequence. In this instance, ATN is true while
Command
1 UNL Set low
2 LAG* Stays low
3 Data Set high
4 Data Stays high
5 Data Stays high
6 Data Stays high
Model 2790 SourceMeter
Table F-3
ATN state ASCII
?
'
EOT
ATN state ASCII
?
'
*
R
S
T
®
Switch System Reference Manual
lists a typical bus sequence for
Data bus
Hex Decimal
3F 63
36 54
04 4
Data bus
Hex Decimal
3F 63
36 54
2A 42
52 82
53 83
54 84