Model 6220/6221 Reference Manual IEEE-488 Bus Overview C-7
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2. Multiline commands — General bus commands which are sent over the
data lines with the ATN line true (low).
3. Common commands — Commands that are common to all devices on the
bus; sent with ATN high (false).
4. SCPI commands — Commands that are particular to each device on the
bus; sent with ATN (false).
These bus commands and their general purpose are summarized in Ta ble C- 1.
Tabl e C- 1
IEEE-488 bus command summary
Command
type Command
State of
ATN line Comments
Uniline
Multiline
Universal
Addressed
Unad-
dressed
Common
SCPI
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)
—
—
X
X
X
Low
X
Low
Low
Low
Low
Low
Low
Low
Low
High
High
Set up devices for remote operation.
Marks end of transmission.
Clears interface.
Defines data bus contents.
Controlled by external device.
Locks out local operation.
Returns device to default conditions.
Enables serial polling.
Disables serial polling.
Returns unit to default conditions.
Returns device to local.
Removes all listeners from the bus.
Removes any talkers from the bus.
Programs IEEE-488.2 compatible instru-
ments for common operations.
Programs SCPI compatible instruments
for particular operations.
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