Measurement-computing Digital488 Bedienungsanleitung PDF herunterladen (Seite 54)

Section 3 Command Descriptions

3.24

Serial Poll Status Byte

The

Serial Poll

Output

byte is sent upon receiving the serial poll command

from the controller. Refer to the

SRQ

description for details on how the

Serial Poll

byte is affected. Below is a description of the significance of each bit in the

Serial Poll

byte.

Bit Location Significance

(SRQ Bit Value if set to logic 1)

DIO1(LSB) 1 Service Input transition

DIO2 2 EDR input transition

DIO3 4 Bus error

DIO4 8 Test error

DIO5 16 Ready for more commands

DIO6 32 not assigned, always 0

DIO7 64 Service Request bit

DIO8 (MSB) 128 not assigned, always 0

Serial Poll Bit Description

DIO1

When enabled by the

command,

DIO1

is set by a transition on the Service

Input line (active transition state determined by the

Invert

command

(I64)

DIO1

is cleared after the controller serial polls the

Digital488.

DIO2

When enabled by the

command,

DIO2

is set on an

EDR

transition (active

transition state determined by the

Invert

command

(I32)

DIO2

is cleared

after the controller serial polls the

Digital488.

DIO3

is set when an invalid command is sent to the

Digital488.

The

command will enable a

Service Request

to occur then an invalid command is

received. The bit is cleared after the controller sends a

Status

command

(U0X)

and reads the status string from the

Digital488.

DIO4

The status of

DIO4

is determined after the

Test

command

(T0X)

is sent to the

Digital488.

If the self test passes, the

DIO4

bit will remain a zero. If the self

test fails,

DIO4

will be set to a logic 1.

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 82 83

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