Ieee-488 Bus Command Summary; Bus Commands - Keithley SourceMeter 2400 User Manual

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2400 Series SourceMeter User's Manual

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 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
Table D-1

IEEE-488 bus command summary

Command
type
Uniline REN (Remote Enable)
EOI
IFC (Interface Clear)
ATN (Attention)
SRQ
Multiline LLO (Local Lockout)
Universal DCL (Device Clear)
SPE (Serial Enable)
SPD (Serial Poll Disable)
Addressed SDC (Selective Device
Clear)
GTL (Go To Local)
Unaddressed UNL (Unlisten)
UNT (Untalk)
Common –
SCPI –
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IEEE-488 Bus Overview
State of
Command ATN line
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.
D-7
Table D-1.
Comments