Measurement-computing Micro 488/EX rev.2.1 Uživatelský manuál stáhnout pdf (Strana 176)

Section 7 Peripheral Pass-Thru Operation

7.4

When serial data is received,

DIO5

of the Serial Poll byte is set, '

', 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 Micro488/EX can generate a request for service on the bus when

it receives the last serial terminator. To enable this feature, the Pass-Thru

Feature switch, located on the internal switch bank of SW1, must be set to

open. When enabled, the Micro488/EX 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 Pass-Thru Feature switch is in the

closed position, there will not be any indication in the serial poll status byte

that a serial terminator has been received.

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

7.4 Serial Poll Status Byte Register

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

the Micro488/EX.

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 "

", when the buffer is empty.

1 2 ... 171 172 173 174 175 176 177 178 179 180 181 ... 217 218

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