C-6 Return to Section Topics 6482-901-01 Rev. A / August 2012
Appendix C: IEEE-488 Bus Overview Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Figure C-2
IEEE-488 handshake sequence
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 C-1.
Data
DAV
Source
Source
Valid
All Ready
Acceptor
NRFD
NDAC
All Accepted
Acceptor
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