Campbell CR500 Spezifikationen PDF herunterladen (Seite 47)

cRs00

TABLE 7.6-1.

ABR

=

Abbreviation

for the

function

name.

PIN

=

Pin

number.

O

=

Signal Out

of the

CR500

to a

peripheral.

|

=

Signal

Into the CR500

from

a

Pe{Pheral'

PIN

ABR

I/O

1

5V

O

RING

I

4RXDI

5

ME

O

Modem

Enable:

Raised

when the

CR500

determines

that a

modem

raised

the

ring

line.

Pin Description

PIN ABR

Description

Synchronous

Device

Enable: Used to

address Synchronous

Devices

(SDs),

and

can

be

used

as

an enable

line

for

printers.

Clocl</Handshake:

Used

with

the

SDE

and

TXD

lines

to

address

and

transfer

data to

SDs.

When not used

as

a clock,

pin

7 can

be used

as a

handshake

line

(during

printer

output,

high

enables,

low

disables).

Not used.

Transmit

Data: Serial

data are

transmitted

from the

C8500

to

peripherals

on

pin

9;

logic low

marking

(0V)

logic

high

spacing

(5V)

standard asynchronous

ASCIl, 8 data

bits,

no

parity,

1 start

bit,

1 stop

bit,300,

1200,9600,

76,800 baud

(user

r/o

o

SDE

Description

5V:

Sources

5

VDC, used

to

power

peripherals.

Signal

Ground:

Provides

a

power

return

for

pin

1

(5V),

and

is used

as a reference

for voltage

levels.

Ring:

Raised

by a

peripheral

to

put

the

CR500

in the

telecommunications

mode.

Receive

Data:

Serial

data transmitted

by a

peripheral

are

received

on

pin

4.

8

9

cLl(Hs

l/o

TXD

selectable

7.7

DAY

OF

YEAR CALENDAR

Add

1 to unshaded

values

during

leap

years'

37

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