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Model 6485 Picoammeter Instruction Manual
These bus commands and their general purpose are summarized in
Table F-1
IEEE-488 bus command summary
Command
Uniline
Multiline
Universal
Addressed
Unaddressed
Common
SCPI
type
Command
REN (Remote Enable)
EOI
IFC (Interface Clear)
ATN (Attention)
SRQ
LLO (Local Lockout)
DCL (Device Clear)
SPE (Serial Enable)
SPD (Serial Poll Disable)
SDC (Selective Device Clear)
GTL (Go To Local)
UNL (Unlisten)
UNT (Untalk)
—
—
IEEE-488 Bus Overview
Table
State of
ATN
line
Comments
X
Set up devices for remote operation.
X
Marks end of transmission.
X
Clears interface.
Low
Defines data bus contents.
X
Controlled by external device.
Low
Locks out local operation.
Low
Returns device to default conditions.
Low
Enables serial polling.
Low
Disables serial polling.
Low
Returns unit to default conditions.
Low
Returns device to local.
Low
Removes all listeners from the bus.
Low
Removes any talkers from the bus.
High
Programs IEEE-488.2 compatible
instruments for common operations.
High
Programs SCPI compatible instru-
ments for particular operations.
F-7
F-1.
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