Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario descargar pdf (Pagina 321)

15A. Driver488/DRV Commands III. COMMAND REFERENCES - 15. Command References

III-306 Personal488 User’s Manual, Rev. 3.0

The

RESUME

command unasserts the Attention (

ATN

) bus signal. Attention is normally kept asserted by

Driver488, but it must be unasserted to allow transfers to take place between two peripheral devices. In

this case, Driver488 sends the appropriate

Talk

and

Listen

addresses, and then must unassert

Attention with the

RESUME

command.

MONITOR

is specified, then Driver488 monitors the handshaking process but does not participate in

it. Driver488 takes control synchronously when the last terminator or

EOI

is encountered. At that

point, the transfer of data stops. The

FINISH

command must be called to assert Attention and release

any pending holdoffs to be ready for the next action.

SEND

SYNTAX

SEND[;] subcommand[subcommand...]

RESPONSE

None

MODE

CA (any subcommands)

Any (DATA and EOI subcommands only)

BUS STATES

User-defined

SEE ALSO

OUTPUT

EXAMPLES

PRINT#1,”SEND MTA UNL LISTEN16 DATA ‘T1S0R2X’”

is the same as

PRINT#1,”OUTPUT16;T1S0R2X”

PRINT#1,”SEND CMD 128,0,10 DATA 156,35 EOI ‘ABC’”

sends the following byte sequence:

Data

10000000

00000000

00001010

10011100

00100011

01000001

01000010

01000011

ATN

*ATN

EOI

*EOI

EOI

The

SEND

command provides byte-by-byte control of data and command transfers on the bus and gives

greater flexibility than the other commands. This command can specify exactly which operations

Driver488 executes. The following subcommands are available within the

SEND

command:

SEND Subcommand Operation (Bus Command or Data Transfer)

UNT

Send the Untalk bus command. ATN is asserted.

UNL

Send the Unlisten bus command. ATN is asserted.

MTA

Send the My Talk Address bus command. ATN is asserted.

MLA

Send the My Listen Address bus command. ATN is asserted.

TALK addr

Send the Talk Address Group (TAG) bus command. ATN is asserted.

LISTEN addr[,addr...]

Send the Listen Address Group (LAG) bus command. ATN is asserted.

DATA {‘data’|number}

[,{‘data’|number}...]

Send character strings data or characters with numeric ASCII values char.

ATN unasserted.

EOI {‘data’|number}

[,{‘data’|number}...]

Send character strings data or characters with numeric ASCII values char.

ATN unasserted. EOI is asserted on the last character.

CMD {‘data’|number}

[,{‘data’|number}...]

Send character strings data or characters with numeric ASCII values char.

ATN asserted.

The

DATA

EOI

and

CMD

subcommands 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

(

number[,number...]

). For example,

DATA‘R0X’

sends the characters

, and

to the active

listeners, while

DATA13,&H0A

sends the carriage return and line feed. Multiple quoted strings or

ASCII valued bytes may be specified by separating them with commas. The

EOI

subcommand is

identical to the

DATA

subcommand except that the End-Or-Identify (

EOI

) signal is asserted on the

transfer of the last character.

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