Measurement-computing Digital488 Bedienungsanleitung PDF herunterladen (Seite 20)

Section 2 Getting Started

2.4

2.3 Digital Input/Output Ports

The

Digital488

has 40 data lines which can be programmed in groups of 8 as

either input or output. At power on, all 40 bits are in the input mode. Each 8 bit group

is one port, beginning with

Port 1

as the least significant 8 bits, and

Port 5

as the most

significant 8 bits.

2.3.1 Logic Levels

The data and handshake output lines will drive two TTL loads. In

addition, ports 1 and 2 outputs are 5 Volt CMOS compatible. All input lines are

less than 1.5 TTL loads. All inputs are protected against damage due to high

static voltages. Normal precautions should be taken to limit the input voltages

to -0.3 to +7.0 volts. All I/O lines are referenced to

COMMON

(Pin 50).

2.3.2 Digital I/O Port Pin Outs

The following diagram illustrates the digital I/O edge connector as view

from the rear of the

Digital488

and the top PC Board edge view of the

Digital488OEM

Digital488 Rear Panel I/O Connector Pin Out

210 20 30 40 50

4939199129

Clear (O)

Trigger (O)

Service (I)

+5 Volts

[ 50 mA Max!]

Not Used

External Data Ready (I)

Inhibit (O)

Data Strobe (O)

Not Used

Common (GND)

Digital I/O

Bits 1 thru 40

(I)

(O)

= Input

= Output

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 82 83

Kommentare zu diesen Handbüchern

Keine Kommentare

Measurement-computing Digital488 Bedienungsanleitung Seite 20

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Hardware Measurement-computing Digital488