Measurement-computing Digital488 Instrukcja Użytkownika Pobierz pdf (Strona 27)

Section 2 Getting Started

2.11

2.4.2 My Listen Address

(MLA)

When the

Digital488

is addressed to listen in the

through

format, it accepts characters from the active talker and interprets these

characters as commands and command parameters. These commands are

explained in Section 3.

In the high speed binary format (

), the command interpreter is

disabled. The

Digital488

treats all bytes received as data to be output to the

Digital I/O ports. Each time it receives five bytes or detects EOI it pulses the

Data Strobe

for approximately 15 microseconds. Data is expected in a

PORT5, PORT4, PORT3, PORT2, PORT1 sequence.

If only two bytes are received, with EOI asserted on the second byte,

the

Digital488

will update PORT5 with the first byte received, PORT4 with

the second and pulse the

Data Strobe

. Since the interface treats all received

characters as data, the

Status

(

) command will not be recognized.

2.4.3 Device Clear

(DCL and SDC)

In the

thru

formats, Device Clear resets the

Digital488

power on defaults and pulses the

Clear

output line for approximately 50

microseconds.

In the high speed binary format (

), it enables the command

interpreter and changes the format to

. All other parameters remain

unchanged. In addition, the

Clear

output line is not pulsed by DCL or SDC

when the interface is in

. This is the only programmable method to exit the

format.

2.4.4 Group Execute Trigger

(GET)

When the

Digital488

recognizes a GET, it pulses the

Trigger

output

line for approximately 50 microseconds.

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 82 83

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