Measurement-computing Micro 488/EX rev.2.1 Manual do Utilizador descarregar pdf (Página 141)

Section 5 Command Descriptions

5.71

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 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 parallel

poll.

The

ENTER

sub-command inputs data from the active talker, setup 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 data must be transferred using the

SEND

command, then multiple

SEND

commands must be used so that they are each

less than 127 characters long. For example…

PRINT#1,"SEND UNT UNL MTA LISTEN 16 DATA 1,2,3,4,5,6"

is equivalent to…

PRINT#1,"SEND UNT UNL MTA LISTEN 16"

PRINT#1,"SEND DATA 1,2,3"

PRINT#1,"SEND DATA 4,5,6"

In this way, a long

SEND

command can be broken up into shorter commands.

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