Measurement-computing Isolator488 Bedienungsanleitung PDF herunterladen (Seite 20)

Section 2 Getting Started

2.11

2.6.2 Cabling Length

The IEEE 488 specification allows for cabling distance between bus

devices of 2 meters (approx. 7 feet). The total worst case distance from the

two furthest devices is not allowed to exceed 20 meters (approx. 70 feet).

The addition of the Isolator488 does not increase this distance.

2.6.3

Signal Line Direction

The signal lines and their direction include....

Data Lines:

DIO1 - DIO7 Bidirectional

Handshake Lines:

DAV Bidirectional

NRFD Bidirectional

NDAC Bidirectional

Command Lines:

SRQ To Controller Bus

ATN To Instrument Bus

EOI Bidirectional

REN To Instrument Bus

IFC To Instrument Bus

The majority of the command lines have their signal direction fixed.

This forces bus control from the CONTROLLER bus.

When Attention (ATN) is asserted, the data lines, talker handshake

line (DAV) and the EOI line direction is forced from the CONTROLLER

to the INSTRUMENT port. The listener handshake lines (NRFD and

NDAC) are forced from the INSTRUMENT to the CONTROLLER port.

The commands are sent through the Isolator488 to the INSTRUMENT

port.

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Measurement-computing Isolator488 Bedienungsanleitung Seite 20