Hi,
   Terrific progress with subject line, congratulations.
But still, please, could you read & follow Russell's=20
recomendations to your previous posting, if possible.

   Mike.

personal wrote:
>=20
> 1:
> char i=3D9, ch[8];
> ;
> ;
> if(ch[i]),,,,,,,gives what???
>=20
> as ANSI C, out boundary will give 0. but in my pic, gives    =20
> CRUSH......
>=20
> why???? something else wrong?
>=20
> 2:
>=20
> atof(char *);   do not work.... some switch somewhere else????
>=20


Russell McMahon wrote:


Judging from your email address, English may not be your 1st language.
If
so, you've done well.

Judging from at least one reply, not everyone is doing as good a job as
they
might have of translating a reasonable request into English (even though
they may live in a country where English of a sort is their first
language).

So, let's see if I can translate your request into something that such
people may understand :-)
(I may get this wrong).

> does any one know, can I only use 4 wires to make
> net cable with j45 connector?
> 1-3 2-6 cross over,,,,,for PC to PC...
> no other pin needed right?

_______________________
TRANSLATION (perhaps):     I am not just asking this question blindly
without having done some research of my own first but I now have a
question
which is not obvious to me. I have done some research into UTP network
cables and found out what plugs are used and what wires appear to be
used.
From my research I have determined that for a "crossover" cable between
two
PCs without a hub or switch, at one end the pair on pins 1 & 2 is
connected
to the wires that go to pins 3 & 6 at the other end. The same "swap" is
performed in the other direction. While it seems logical to me that
using
just these wires should be enough there MAY be some other aspect that I
am
not familiar with that makes it desirable or necessary to connect the
other
pins as well. As I have not found this mentioned elsewhere I have
decided to
ask the PICList members' advice. I have not asked list members by
private
email as, although some don't mind at all, I know some don't seem to
appreciate this. I have not used very many words in this request as
constructing any message in English is somewhat time consuming for me so
I
tried to make my request as concise as I could.
_________________

Hopefully the above "translation" will allow people who use English as a
first language and whose minds are not perhaps flexible enough to cope
with
reasonable requests from those who do not have English as a first
language
to understand and answer the question.

For what it's worth, my understanding on this is as follows:
A UTP network cable may be made using only two pairs of wires.
One twisted pair should connect to pins 1 & 2. The other should connect
to
pins 3 & 6.
Where the cable is to be used to connect a PC to a network hub the
following
connections should be used.

1 - 1
2 - 2
3 - 3
6 - 6

Where the cable is to be used to connect from PC to PC without a hub a
"crossover" cable should be used where the transmit pair in one
direction is
connected to the receive pins at the other end.
ie

1 - 3
2 - 6
3 - 1
6 - 2

If you do have extra pairs in the cable they SHOULD be terminated
according
to the published standards (available on net) as if they are left
floating
they can cause problems with data corruption.

So, yes - your research and assumptions were correct although, as
Robert
Rolf's good answer points out, it is possible to confuse what you meant
when
you wrote the numbers. What he said and what you said about connection
numbering was correct (probably) but it was possible to get the wrong
idea
when reading them. Hopefully the "explicit" connection information above
makes the connections clear. If not, ask again - there are no silly well
researched questions on the PICList (they tell me) - just ones which may
be
misunderstood if people don't try a little to understand them.

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