Measurement-computing Analyzer488 Instrukcja Użytkownika Pobierz pdf (Strona 131)

Section 4 Serial Controller

4.37

HANDSHAKING STEP

allows the user to participate in bus events

one event at a time. The Analyzer488 performs one bus handshake

upon receipt of the

STEP

command. The

STEP

command must be

used to complete each bus event when using the

ASSERT

and

VIEW

commands. However, when using the

READ

WRITE

commands,

the

STEP

command is not required.

STEP

may be used when

recording, or participating in bus events.

MODE High or Low Level Controller

BUS STATES Dependent on the current state of the bus.

QUERY Present handshake speed.

RESPONSE

EXAMPLES

PRINT #1,"CONTROLLER OFF"

Select low level control

PRINT #1,"HANDSHAKE NONE"

Do not participate in bus

events

PRINT #1,"RECORD ON"

Record bus events without

appearing to be an active

listener.

PRINT #1,"CONTROLLER OFF"

Select low level control

PRINT #1,"HANDSHAKE STEP"

Participate in bus events in

single step speed

PRINT #1,"ASSERT REN ATN"

Assert ATN and REN to

cause devices to interpret data

as bus commands

PRINT #1,"WRITE &H3F"

Send UNL command

PRINT #1,"WRITE &H50" Send TAG16 command

PRINT #1,"VIEW BUS"

Read current bus status

INPUT #1,A$ : PRINT A$

Print response

PRINT #1,"STEP"

Perform 1 handshake

PRINT #1,"VIEW BUS"

Read current bus status

INPUT #1,A$ : PRINT A$

Print response

1 2 ... 126 127 128 129 130 131 132 133 134 135 136 ... 280 281

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