Measurement-computing Analyzer488 Manual do Utilizador descarregar pdf (Página 162)

Section 4 Serial Controller

4.68

EOI {'data'|char[,char…]}

Send character strings,

data,

or characters with numeric

ASCII values,

char.

ATN is unasserted. EOI is

asserted on the last character.

CMD {'data'|char[,char…]}

Send character strings,

data,

or characters with numeric

ASCII values,

char.

ATN is asserted.

ENTER

Request data from a device terminating on LF. ATN is

unasserted.

The

DATA

EOI

and,

CMD

sub-commands send data bytes or

characters over the bus. The characters to be sent are specified either

as a quoted string (

'data'

) or as individual ASCII values

(

char[,char…]

). For example,

DATA'R0X'

sends the characters

, and

to the active listeners, and

DATA

13,&H0A

sends

carriage-return and line-feed. Multiple ASCII

char

bytes may be

specified by separating them with commas.

The

EOI

sub-command is identical to the

DATA

sub-command

except that the End Or Identify (EOI) signal is asserted on the

transfer of the last character.

The

CMD

sub-command sends the data bytes with Attention

(ATN) is asserted. This tells the bus devices that the characters are

to be interpreted as IEEE 488 bus commands, rather than as data.

EOI is not asserted during

CMD

transfers. For example

CMD

&H3F

is the same as Unlisten (

UNL

). Note that it is not possible to assert

EOI during the transfer of a command byte because EOI and ATN

together specify an IEEE parallel poll command.

The

ENTER

sub-command inputs data from the active talker,

which has been set to Talk from either a

TALK addr

sub-

command, or a previous

ENTER

command. Addresses are not

allowed to be specified as options to this sub-command. The

ENTER

sub-command will terminate upon detection of a Line Feed (LF)

character.

Note that the maximum length of the

SEND

command,

including any sub-commands, is 127 characters. If large amounts of

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