Measurement-computing Serial488A Manuel d'utilisateur télécharger pdf (Page 54)

4.5

Serial Poll Status Byte

DIO8 DIO7 DIO6 DIO5 DIO4 DIO3 DIO2 DIO1

1428163264128

IEEE Input Bu

ffer Not Empt y

Not Used - Al ways '0'

Serial Handsh ake

Not Used - Al ways '0'

Serial Input Buffer Not Em pty

Request Servi

ce - rsv bit

IEEE Input Bu ffer Full

Last Serial I nput Terminat or

DIO7 rsv

This bit is defined by the IEEE 488 Specification and is used to

indicate to the bus controller that the

Serial488A

is the bus device

that requested service. It is cleared when the interface is serial

polled by the controller.

DIO6 Not Defined - Always "0"

DIO5 Serial Input Buffer NOT EMPTY

This bit is set when the serial input buffer contains one or more

data bytes which have not been sent out the IEEE bus. It is

cleared, set to "0", when the buffer is empty.

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Measurement-computing Serial488A Manuel d'utilisateur Page 54