Measurement-computing Digital488 Manual de usuario descargar pdf (Pagina 55)

Section 3 Command Descriptions

3.25

The

command will cause a

Service Request

to be generated in addition

DIO4

being set if the self test fails. The

DIO4

bit is cleared after the

controller sends a

Status

command

(U0X)

and reads the status string from

the

Digital488.

DIO5

The

DIO5

bit is set after an entire command string has been received and

processed by the

Digital488.

The bit is clear while the

Digital488

processing commands which have been received from the controller. When

used with the

M16

command, a

Service Request

will also be generated

when the

DIO5

bit is set. An

Execute

command

(X)

must be received

before the

DIO5

bit can be cleared.

DIO6 DIO6

is not used, and is always a logic zero.

DIO7

When the

Digital488

generates a

Service Request,

the

DIO7

will be set to a

logic one. This is used by the controller to determine that the

Service

Request

was generated by the

Digital488.

DIO8 DIO8

is not used, and is always a logic zero.

Example:

CLEAR 718

reset the

Digital488

OUTPUT 718;"M4X"

select SRQ on Bus error

OUTPUT 718;"F7X"

send an invalid bus command.

ERROR and SRQ LEDs should illuminate

SPOLL (718)

display should be

(64+16+4)

64 denotes the

Digital488

was the source of the SRQ. 16 denotes the

Digital488

READY for more commands. 4 denotes a Bus error.

When serial polled,the SRQ LED will turn off.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 82 83

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Measurement-computing Digital488 Manual de usuario Pagina 55

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