Keithley 6517A User Manual

IEEE-488 Bus Overview
D-8
Typical command sequences
For the various multiline commands, a specific bus sequence
must take place to properly send the command. In particular,
the correct listen address must be sent to the instrument be-
fore it will respond to addressed commands. Table D-3 lists
a typical bus sequence for sending the addressed multiline
commands. In this instance, the SDC command is being sent
to the instrument. UNL is generally sent as part of the se-
quence to ensure that no other active listeners are present.
Note that ATN is true for both the listen command and the
SDC command byte itself
Table D-4 gives a typical common command sequence. In
this instance, ATN is true while the instrument is being ad-
dressed, but it is set high while sending the common com-
mand string.
IEEE command groups
Command groups supported by the Model 6517A are listed
in Table D-5. Common commands and SCPI commands are
not included in this list.
Table D-5
IEEE command groups
HANDSHAKE COMMAND GROUP
NDAC = NOT DATA ACCEPTED
NRFD = NOT READY FOR DATA
DAV = DATA VALID
UNIVERSAL COMMAND GROUP
ATN = ATTENTION
DCL = DEVICE CLEAR
IFC = INTERFACE CLEAR
REN = REMOTE ENABLE
SPD = SERIAL POLL DISABLE
SPE = SERIAL POLL ENABLE
ADDRESS COMMAND GROUP
LISTEN
TALK
LAG = LISTEN ADDRESS GROUP
MLA = MY LISTEN ADDRESS
UNL = UNLISTEN
TAG = TALK ADDRESS GROUP
MTA = MY TALK ADDRESS
UNT = UNTALK
OTA = OTHER TALK ADDRESS
ADDRESSED COMMAND GROUP
ACG = ADDRESSED COMMAND GROUP
GTL = GO TO LOCAL
SDC = SELECTIVE DEVICE CLEAR
STATUS COMMAND GROUP
RQS = REQUEST SERVICE
SRQ = SERIAL POLL REQUEST
STB = STATUS BYTE
EOI = END
Table D-5
IEEE command groups

Keithley 6517A Specifications

General

Brand	Keithley
Model	6517A
Category	Measuring Instruments
Language	English