Measurement-computing Digital488 Bedienungsanleitung PDF herunterladen (Seite 25)

Section 2 Getting Started

2.9

2.3.3.5 Trigger

(Pin 43)

The

Trigger

output is pulse for approximately 50

microseconds after a

GET

(Group Execute Trigger) command is

received from the bus controller. The trigger pulse is normally active

high, but can be made active low with the

Invert

command (

). The

Handshake

command (

) can independently pulse the

Trigger

line,

independent of any bus activity.

Timing Diagram for Trigger Output

Trigger

75 µS typ 50 µS typ

GET

2.3.3.6 Service

(Pin 45)

The

Service

input is an edge sensitive input capable of

generating a bus

Service Request

(

SRQ

)

It is enabled with the

SRQ

command (

) and defaults to rising-edge sensitive. The

Invert

command (

I64

) can be used to program it to be falling-edge sensitive.

2.4 IEEE 488 Bus Implementation

The

Digital488

implements many of the capabilities defined by the IEEE 488

1978 specification. These are discussed in the following sections. Those bus uniline

and multiline commands that the

Digital488

does not support or respond to include:

Remote Enable

(REN)

Parallel Poll

(PP)

Go to Local

(GTL)

Parallel Poll Configure

(PPC)

Local Lockout

(LLO)

Parallel Poll Unconfigure

(PPU)

Take Control

(TCT)

Parallel Poll Disable

(PPD)

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 82 83

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