Measurement-computing Serial488A Manuel d'utilisateur télécharger pdf (Page 53)

4.4

When serial data is received, DIO5 of the Serial Poll byte is set, '1', to

indicate to the IEEE controller that the serial input buffer is NOT EMPTY.

If set, it indicates that at least one character is available in the serial input

buffer to be read by the IEEE controller. Once all of the serial input data is

read by the IEEE controller this bit is reset.

The

Serial488A

can generate a request for service on the bus when it

receives the last serial terminator. To enable this feature, the

Peripheral

SRQ

switch, located on the internal switch bank of SW1, must be enabled.

When enabled, the

Serial488A

will assert the IEEE bus

SRQ

line and set

serial poll status bits DIO7 and DIO3 when the last serial terminator is

detected. The IEEE controller must perform a serial poll on the interface to

clear the

SRQ

. If the

Peripheral SRQ

switch is in the disabled position,

there will still be an indication in the serial poll status byte that the last

serial input terminator was received, but

Serial488A

will not generate a

service request (

SRQ

SW1 View For Selecting SRQ on Last Terminator

OPEN

12345678

DOT

Switch

Side

View

OPEN

12345678

SRQ on Last

Terminator Disabled

SRQ on Last

Terminator Enabled

4.4 Serial Poll Status Byte Register

The following shows and describes the serial poll status information provided by

the

Serial488A

DIO8 IEEE Input Buffer NOT Empty

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

data bytes which have not been sent out the serial port. It is

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

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 84 85

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Measurement-computing Serial488A Manuel d'utilisateur Page 53

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