Measurement-computing Serial488A Instrukcja Użytkownika Pobierz pdf (Strona 39)

3.5

3.4.2 Talk Back On Time Out

SW2-2 selects whether the

Serial488A

should address the attached

bus device to talk when the

Serial488A

has no more serial data to send.

This feature relies on time and not on terminators. Its use is primarily for

simulating a serial plotter from an IEEE 488 [HP-IB] plotter. The factory

default is

Talk-back

On Time Out

enabled.

SW2 View for Talk-Back on Time-Out Selection

OPEN

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DOT

Switch

Side

View

OPEN

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Talk Back on

Time Out Disabled

Talk Back on

Time Out Enabled

Talk-Back on Time-Out

is enabled, then

Serial488A

waits

approximately 100 milliseconds after it detects its serial input buffer is

empty. If no serial character has been received by the end of this time, the

IEEE bus device is addressed to talk. The choice of talk-back modes

depends strongly on the type of device and software being used. For most

plotter applications the

Talk-back on Time-Out

feature should be

enabled.

When the last IEEE bus terminator is detected from the IEEE device,

the

Serial488A

disables the device from sending additional information by

asserting Attention (ATN) on the bus. If the IEEE device does not respond

or finish transmission by the time additional characters are received into

the serial input buffer, the talk sequence will be aborted to allow additional

serial information to be sent to the IEEE device.

Most IEEE 488 plotters will not respond to the talk address sequence

with output data unless there has been a specific device dependent

command sent to tell them what to say. If they have not been told what to

say, they say nothing.

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