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APPENDIX G
Table G-2. Hexadecimal
and Decimal
Command
Codes
, Command
GTL
SDC
GET
LLO
DCL
SPE
SPD
LAG
TAG
SGG
UNL
UNT
Hex Value
01
04
OX
11
14
18
19
20.3F
40.5F
60.7F
3F
5F
Decimal
Value
1
4
8
17
20
24
25
32-63
64.95
96-127
63
95
Typical
Command
Sequences
For the various multiline
commands,
a specific bus se-
quence must take place to properly
send the command.
In particular, the correct listen address must be sent to the
instrument before it will respond to addressed commands.
Table 4-3 lists a typical bus sequence for sending an ad-
dressed multiline
command.
In this instance, the SDC
command is being sent to the instrument.
UNL is gcncrally
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 command byte itself.
Table G-3. Typical Addressed Command Sequence
Command
ATN State
UNL
1 Set low
Table G-4 gives a typical device-dependent
command se-
quence. In this instance, ATN is true while the instrument
is being addressed, but it is set high while sending the
device-dependent
command string.
Table G-4. Typical Device-Dependent
Command
*Assumes primary
address = 9.
IEEE Command
Groups
I
Data Bus
ASCII
7
Table G-5. IEEE Command
Group
HANDSHAKE
COMMAND
CROUP
DAC=DATA
ACCEPTELI
RFD=READY
FOR L)Ali\
DAV=DAIA
VALID
UNIVERSAL
COMMAND
GROUP
ATN=ATTENTION
DCL=DEVICE
CLEAR
IFC=INTERFACE
CLEAR
L.LO=LOCAL
LOCKOU'I
REN=REMOTE
ENABLE
SPD=SEKIAL
POLL DISABLE
SPE=SERIAL. POLL ENAl3L.I:
ADDRESS
COMMAND
GROUN
LISTEN:
L.AG=LISTEN
ADDRESS GROL'I'
MLA=MY
LISTEN ADI)RESS
LJNL=UNLISTEN
TALK: TAG=TALK
ADDRESS GROUI'
MTA=MY
TALK ADDRESS
UNT=UNTALK
OTA=OTHEII
TALK AUDRESS
ADDRESSED
COMMAND
GROUP
ACG=ADDRESSED
COMMANL)
GROUI
GET=GROUI'
EXECUTF l'RI(;GER
GTL=GO
TO LOCAL
SDC=SELECTIVE
CLEAR
STATUS COMMAND
GROUP
RQS=REQUEST
SERVICE
SRQ=SERIAL
POLL. REQUEST
STB=STATUS IWTt:
EOI=END
G-?/G-6
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