Keithley 6517B Reference Manual

A
ppendix D: IEEE-488 bus overview Model 6517B Electrometer Reference Manual
D-6 6517B-901-01 Rev. C / August 2015
Bus commands
The instrument may be given a number of special bus commands through the IEEE-488 interface.
This section briefly describes the purpose of the bus commands, which are grouped into the following
four categories:
1. Uniline commands: Sent by setting the associated bus lines true. For example, to assert REN
(remote enable), the REN line would be set low (true).
2. Multiline commands: General bus commands that 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 purposes are summarized in the following table.
IEEE-488 bus command summary
Command type Command
State of
ATN line Comments
Uniline
REN (remote enable)
EOI
IFC (interface clear)
ATN (Attention)
SRQ
X
X
X
Low
X
Set up devices for remote operation
Marks end of transmission
Clears interface
Defines data bus contents
Controlled by external device
Multiline
Universal
LLO (local lockout)
DCL (device clear)
SPE (serial enable)
SPD (serial poll disable)
Low
Low
Low
Low
Locks out local operation
Returns device to default conditions
Enables serial polling
Disables serial polling
Addressed
SDC (selective device clear)
GTL (go to local)
Low
Low
Returns unit to default conditions
Returns device to local
Unaddressed
UNL (unlisten)
UNT (untalk)
Low
Low
Removes all listeners from the bus
Removes any talkers from the bus
Common — High
Programs IEEE-488.2 compatible
instruments for common operations
SCPI — High
Programs SCPI compatible instruments
for specific operations

Keithley 6517B Specifications

General

Brand	Keithley
Model	6517B
Category	Measuring Instruments
Language	English