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APPENDIX C

Table C-2. Hexadecimal and Decimal Command

Table C-4. Typical Device-Dependent Command

Codes

Sequence

Command

GTL

SDC

GET

LLO

DCL

SPE

SPD

LAG

TAG

SGG

UNL

UNT

Hex VaIue

2Q3F~

40-SF

60s

Decimal Value

32-63

64-95

96-127

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 C-3 lists a typical bus sequence for ~sending an ad-

dressed multiline command. In this in&rice, the SDC

command is beiig sent to the instruinent. LIhX @ generally

sent as part of the sequence to ensure that no other active

listeners are present. Note that ATN is hue for both the

listen command and the SDC~&mmand byte itself.

Table C-3. Typical Addressed Command Sequence

*Assumes primary address = 26.

Table C-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.

I I I I Data Bus I

ASCII Hex Decimal

1 UNL Set low ? 3F‘ 63

2 LAG* Stays low 3A 58

3 Data Set high x G 82

4 Data Stays high 48

5 DZti Stays high

58 88

*Assumes primary address = 26.

IEEE Command Groups

Command groups supported by the Model 199 are listed

in Table C-5. Device-dependent commands are not includ-

ed in this list.

stable C-5. IEEE Command Group

HANDSHAKES COMMAND GROUP

DAC= DATA AC-ED

RFD&READY FOR DATA

DAV= DATA VALID

UNIVERSAL COMMAND GROUP

ATN=ATIENTION

DCL=DEVICE CLEAR

IFC=INTERFACE CLEAR

LLO=I.QCAL LOCKOUT

REN=REMOTE ENABLE

SPD=SERIAL POLL~DISABLE

SPE=SERIAL POLL ENABLE

ADDRESS COMMAND GROUN

LISTEN: LAG=LISTEN ADDRESS GROUP

MLA=MY LISTEN ADDRESS

UNL=UNLISTEN

TALK: TAG=TALK ADDRESS~ GROUP

MZ%=MY TALK ADDRESS

uNT=uNTALK

OTA=Ol-HER TALK ADDRESS

ADDRESSED COMMAND GROUP

ACG=ADDRESSED COMMAND GROUP

GET=GROUP EXECUTE TRIGGER

GTL=GO ‘ID LOCAL

SDC=SELECTIVE CLEAR

STATUS COMMAND GROUP

RQS=REQUEST SERVICE

SRQ=SERIAL POLL REQUEST

STB=STATUS BYTE

EOI=END

C-7/C-8

Brand	Keithley
Model	199
Category	Scanner
Language	English

Keithley 199 User Manual

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Keithley 199 Specifications