Typical Addressed Command Sequence; Typical Device-Dependent Command Sequence; Ieee Command Group - Keithley 595 Instruction Manual

APPENDIX F
Table F-2. Hexadecimal and Decimal Command
Codes
SDC
GET
LLO
DCL
SPE
SPD
LAG
TAG
SGG
EEk
Command Hex Value Decimal Vahe
GTL
01
!
04
08
11
14
E
20-3F
40-5F
1
ii
37
20
24
323
64-95
96-w
63
95
Typical Command Sequences
For
the
various
multiline
co
mmands, a specific bus se-
cluence must take place to properly send the command.
In particular, the correct listen address must be sent to the
mstmment before it will respond to addressed commands.
Table F3 lists a typical bus sequence for sending an ad-
dressed multiline co mmand. In this instance, the SDC
command is being sent to the instrument. UNL is generally
sent as part of the sequence to ensure that no other active
listeners are present. Note that ATN is true for both the
listen command and the SDC~ co mmand byte itself.~
Table F-3. Typical Addressed Command Sequence
Data Bus
Step
Command ATN State ASCII 1 Hex Decimal
1
UNL set low
? 3F 63
2
LAG* stays low
141
SDC~ Stays low &T
Retnms high
3C 1 60
41 4
I
-!-!--I
*-es primary address = 28.
Table F-4 gives a typical device-dependent command se-
quence. Jn this instance, MN is true while the instrument
is being addressed, but it is set high while sending the
devicedependent co mmand string.
Table F-4. Typical Device-Dependent Command
Sequence
*Assumes primary address = 28.
IEEE Command Groups
Data Bus
Step Command ATN State ASCII Hex Decimal
1 UNL
set low ? 3F 63
: LAG* Data
stays Set low high < F 3c 52 60 82
4 Data
Stays high 30 48
5
Data
Stays high
L670
Command groups supported by the Model 595 a~ listed
in Table F5. Device-dependent con-man ds are not included
inthklist.
Table F-5. IEEE Command Gloup
HANDSHAKE COMMAND GROUP
DAC=DATA ACCEPTED
RFD=READY FOR Dm
DAV=DATA VALID
UNIVERSAL COMMAND GROUP
AIN=ATTENTION
DCL=DEVICE CLEAR
IFC=INTERFACE CLEAR
LLO=LOCAL LOCKOUT
REN=REMOTE ENABLE
SPD=SERL4L POLL DISABLE
SPE=SBRIAL POLL ENABLE
ADDRESS COMMAND GROUN
LISTEN: LAG=LISTEN ADDRESS GROUP
MLA=h4Y LISTEN ADDRESS
uNL=uNL1sTEN
TALK TAG=TALK ADDRESS GROUP
hJTA=MY TALK ADDRESS
UNT=UNTALK
OTA=OTHER TALK ADDRESS
ADDRESSED COMMAND GROUP
ACG=ADDRESSED COMMAND GROUP
GET=GROUP EXECUTE TRIGGER
GTL=GO To LOCAL
SDC=SELECTIVE CLEAR
STATUS COMMAND GROUP
RQS=REQUEST SERVICE
SRQ=SERIAL POLL REQUEST
sTB=sTp;Tus BYTE
EOI=END
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