F-12
IEEE-488 Bus Overview
Model 6485 Picoammeter Instruction Manual
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.
lists a typical bus sequence for
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.
gives a typical common command sequence. In this instance, ATN is true while
the instrument is being addressed, but it is set high while sending the common command
string.
Table F-4
Typical bus sequence
Step
Command
ATN state
Data bus
ASCII
Hex
Decimal
1
2
3
4
UNL
LAG*
SDC
Set low
Stays low
Stays low
Returns high
?
.
EOT
3F
2E
04
63
46
4
*Assumes primary address = 14.
Table F-5
Typical addressed command sequence
Step
Command
ATN state
Data bus
ASCII
Hex
Decimal
1
2
3
4
5
6
UNL
LAG*
Data
Data
Data
Data
Set low
Stays low
Set high
Stays high
Stays high
Stays high
?
.
*
R
S
T
3F
2E
2A
52
53
54
63
46
42
82
83
84
*Assumes primary address = 14.
Summary of Contents for 6485
Page 20: ......
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Page 44: ...1 20 Getting Started Model 6485 Picoammeter Instruction Manual ...
Page 66: ...3 6 Measurements Model 6485 Picoammeter Instruction Manual ...
Page 138: ...9 20 Remote Operation Model 6485 Picoammeter Instruction Manual ...
Page 159: ...11 CommonCommands ...
Page 164: ...11 6 Common Commands Model 6485 Picoammeter Instruction Manual ...
Page 165: ...12 SCPISignalOriented MeasurementCommands ...
Page 190: ...14 12 SCPI Reference Tables Model 6485 Picoammeter Instruction Manual ...
Page 214: ...16 14 Calibration Model 6485 Instruction Manual ...
Page 219: ...A Specifications ...
Page 221: ...B StatusandErrorMessages ...
Page 227: ...C GeneralMeasurement Considerations ...
Page 233: ...D DDCEmulationCommands ...
Page 247: ...E ExamplePrograms ...
Page 250: ...E 4 Example Programs Model 6485 Picoammeter Instruction Manual ...
Page 251: ...F IEEE 488BusOverview ...
Page 266: ...F 16 IEEE 488 Bus Overview Model 6485 Picoammeter Instruction Manual ...
Page 267: ...G IEEE 488andSCPI ConformanceInformation ...
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