Measurement-computing Analyzer488 Manuel d'utilisateur télécharger pdf (Page 175)

Section 4 Serial Controller

4.81

STEP

The

STEP

command causes the Analyzer488 to perform one source or acceptor

handshake when

STEP

handshake is selected. The

STEP

command is used to

complete a handshake and allow new data to be placed on the bus (in Talk State), or

received from the bus (in Listen State).

The query option,

STEP?,

returns

(True) if there is data on the bus to be read

or if a bus device is waiting for data. STEP? returns

(False) otherwise.

TYPE Low Level Controller command

SYNTAX STEP [?]

RESPONSE None

MODE Low Level Controller

BUS STATES Dependent on data on the bus

QUERY Returns

(True) if there is data on the bus to be read or if a bus

RESPONSE device is waiting for data. Returns

(False) otherwise.

EXAMPLES PRINT#1,"CONTROLLER OFF"

PRINT#1,"ASSERT IFC ATN REN"

PRINT#1,"UNASSERT IFC"

PRINT#1,"TALK"

PRINT#1,"HANDSHAKE STEP"

PRINT#1,"WRITE &H54" Send TAG20 command

PRINT#1,"UNASSERT ATN"

PRINT#1,"LISTEN"

PRINT#1,"VIEW BUS" View data from device 20

INPUT#1,A$:PRINT A$

one byte at a time

PRINT#1,"STEP"

PRINT#1,"VIEW BUS"

INPUT#1,A$:PRINT A$

PRINT#1,"STEP"

PRINT#1,"VIEW BUS"

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 280 281

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Measurement-computing Analyzer488 Manuel d'utilisateur Page 175

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