Measurement-computing Analyzer488 Uživatelský manuál stáhnout pdf (Strana 130)

Section 4 Serial Controller

4.36

HANDSHAKE

The

HANDSHAKE

command sets the Analyzer488 bus handshaking speed when

functioning as either a high or low level controller. The handshake selection is used to

control the speed of bus transfers when participating in bus events. Handshaking may

be set to

FAST

SLOW

(with a specified

rate

NONE

, or

STEP

. When in the High

Level Controller Mode, set handshake to

FAST

NONE

to prevent the Analyzer488

handshake circuitry from affecting the speed of bus events.

The query command,

HANDSHAKE?

returns the present handshake speed.

TYPE System

SYNTAX HANDSHAKE {[?]|[FAST|STEP|NONE|SLOW{<rate>}]}

rate

is the number of bus events per second, from 1 to 10

RESPONSE None

REMARKS

HANDSHAKE FAST

is used is used for participating in bus events

without limiting the speed. This selection may not be useful when

viewing bus events because the display rate cannot keep up with a

fast bus event rate.

HANDSHAKE SLOW,

with a specified

rate

is useful for viewing

bus data as it is transferred. The Analyzer488 participates in bus

handshaking and limits the speed to 1 to 10 events per second.

Selection of the exact speed is accomplished by following the

command keyword

SLOW

with a number from 1 to 10.

HANDSHAKE

SLOW

may also be used when recording bus events.

HANDSHAKING NONE

is used to record or view bus data without

the Analyzer488 appearing to be a listener. The Analyzer488 does

not participate in bus handshaking and has no control of the bus

event speed.

HANDSHAKING NONE

cannot be used when

participating in bus events as an active talker or listener.

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