Elenco Electronics MO-1251 Manual do Utilizador descarregar pdf (Página 76)

100

5 5

6 6

9 9

25 -PIN

CONNECTOR

(MALE)

36 -PIN

CENTRONICS

PARALLEL

PRINTER

CONNECTOR

(FEMALE)

Fig. 5.

ADAPTER for testing a standard

printer cable with a male Centronics

plug on one end.

connector, strip back the outer

cable jacket about

11/2

inches.

ex-

posing

the 15 wires. Then strip ' /8

inch of insulation from 13 of

the

wires,

and cut off the remaining

two wires. Tin

each of the ex-

posed

ends. Repeat the process

for

the other end of the cable, but

strip

4 inches

of outer jacket and

3/8 of an inch of insulation

from

each wire. The wires

on the con-

nector end

are soldered to the 13

pins

as shown in Fig. 4.

The

wires on the

other end are inser-

ted into the

appropriate points

on the breadboard.

Cut forty -eight 4 -inch lengths

of no. 22 solid wire,

stripping '/8

of an inch of insulation from

one

end and :' /8

of an inch of insula-

tion

from the other. Solder the Vs-

inch stripped end of a wire

to pin

1 of

J1.

Repeat

that

process

for

pins 2 -24 of

J1 and pins 1 -24 of

(J1 and

J2 are standard 25-

"D" connectors). Make a

bracket out of a piece of

alumi-

num

and then mount J1 and

on the bracket. Finally, insert

the

free end of

each of the

forty

eight

wires into

the appropriate points

on the

breadboard.

The three

AA batteries are

LISTING 1

1 REM" PC Cable

Tester Program

2 REM'. Name: PCCABLE

4 REM'. V871017

DEF SEO =64:KEY OFF:DEFINT

I,O:DIM I(5761,0(576)

20 CLS:CNT

=1:PRINT TAB(30) ;'P.C.

CABLE

TESTER':PRINT

STRINGa(79,223)

LOCATE 4,15:PRINT STRINOS(50,32):LOCATE 4,15:LINE INPUT'How many

wires

the cable

(1-

24)7... ';NLa:NL

=VAL(NLa)

40 IF NL (1 OR NL)24 THEN 20

N1 =INT(NL /8):N2 =NL

MOD 8:IF 112 =0 THEN N2 =7 ELSE N2 =N2 -1

60 LOCATE 6,18,O:PRINT'Checking

for

Connections

on Line:'

90 T =TIlIER

100 FOR I =1 TO NL

110

IF I =1

THEN OUT

890,5 ELSE IF I =9 THEN OUT 890,6 ELSE IF I =17 THEN OUT

890,0

120 OUT 888,1I

-1) AND

7:LOCATE

6,52:PRINT USINO'ee';I

130 GOSUB 250:NEXT

140 CLS:PRINT TAB(301;'P.C. CABLE TESTER':PRINT STRING /(79,223)

150

LOCATE

3,22,1:PRINT USINO'Test

Completed in

gee.*

seconds.';TIMER -T

160 IF CNT =1

THEN

LOCATE

5,28:PRINT110 CONNECTIONS FOUND.':GOTO 190

170

LOCATE 5,1:PRINT'CONNECTION FOUND BETWEEN

THE

FOLLOWING

INPUT AND

OUTPUT

LINES

(IN/OUT):'

180 FOR I=0 TO CNT- 2:LOCATE

MOD

10)+7,INT(I

/10)'10.1:PRINT

USINO'ee

/ee';

I(I+1);0(I+1) ;:NEXT

190

LOCATE

18,27:PRINT'Another

Test (Y

/N)'...

;

200 WS

=INPUTS(1):WS

=CHR$(ASC(WS) AND

223):IF

WSO'Y'

AND

WS()'N'

THEN 200

210 PRINT

WS:IF

WS ='Y' THEN

220

LOCATE

18,27:PRINT'PC

CABLE TESTER OFF LINE.

230 OUT 888,O:OUT 890,238:END:REMe TURN

EVERYTHING OFF BEFORE

ENDING

240 REM" SUBROUTINE

TO CHECK EACH INPUT LINE

250 L1 =7:IF NL(8 THEN

=N2

260 MASK

=192:C=1:FOR L =0 TO L1:OUT 888,(MASK+L'8+(INP(8881

AND

7)):00SUB

310:

L:IF NL(9 THEN RETURN

270 L1 =7:IF

NL(16 THEN L1 =N2

280 MASK =128:C

=9:FOR L =0 TO L1:OUT 888,(MASK +L'8.(INP(888) AND 7)1:00SUB

310:

NEXT L:IF NL(17

THEN

RETURN

290 MASK

=64:C

=17:FOR

L =0 TO N2:OUT 888,(MASK.L8.(INP(888) AND 7)):GOSUB

310:

L:RETURN

300

REM'. SUBROUTINE TO CHECK FOR CONTINUITY

310 IF (INP(880) AND

128) =128

THEN

RETURN

320

IF (INP(889) AND 128)0 0 THEN LOCATE 10,1:PRINT'"

ERROR " ':STOP

330 I( CNT ) =I:0(CNT)=L+C:CNT =CNT+1:RETURN

housed

in a

standard battery

holder. You

can use a power

switch, but it's just as

easy to in-

sert or remove

the

battery

wire

to the breadboard.

The

breadboard.

batteries

and

bracket

can be mounted

on a

plywood

base.

To test a cable without

25 -pin D

connectors,

make a suitable

adapter.

One end of the

adapter

will

be a 25

"D"

plug. The

other end will

have a mating

con-

nector for the

cable to be tested.

These

two connectors are

then

attached. An adapter for

a 36 -pin

Centronics connector

is shown

in Fig.

Operation

Type in and

save the

BASIC

program

shown

in Listing 1 (or

download

PCCABLE. BAS

from

the RE -BBS

-516- 293 -3000).

At-

tach

the cable

tester to your PC's

printer port

and then run

the

program.

Connect the cable

to be

tested to the input

and output

jacks of

the tester. When the pro-

gram

asks How

many

wires in

the

cable (1 -24) ?, enter

the ap-

propriate

number;

if you're not

sure,

enter 24. The program

will

then

check all possible

combina-

tions of lines

and

give

you a list

connections found.

Each item in

the list is of the

form

1/1, meaning

that pin 1 of

the connector

that is attached to

the tester's input

is connected to

1 of the other connector

at the

tester's

output. On a standard

4.77 -MHz

PC, it takes about

seconds

to test all 24 lines in

all

Fig. 6. The completed ruble

tester. Con-

struction

is not critical. and a prototyp-

ing board should

give good

results.

576 combinations;

testing fewer

lines

decreases the test time.

Compiling the

program reduces

test time considerably..CD«

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Elenco Electronics MO-1251 Manual do Utilizador Página 76

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