Pc serial connection ?

[coulyo]

Hello all,
I want to build a PIC project which can be found here
http://www.piclist.com/techref/piclist/cheapic/alphabet.htm
My question : is it necessary to connect pins 7 & 8
and pins 1, 4, and 6 as shown in the picture in Alphabet.asm,
since all we are using are send and receive (pins 2 & 3) ?
Tia

 

[Howard Henry Schlunder]

"coulyo" wrote in message news:bjt0ba$3fr$1@sparta.btinternet.com...

I want to build a PIC project which can be found here
http://www.piclist.com/techref/piclist/cheapic/alphabet.htm
My question : is it necessary to connect pins 7 & 8
and pins 1, 4, and 6 as shown in the picture in Alphabet.asm,
since all we are using are send and receive (pins 2 & 3) ?

No. Feel free to leave them completely disconnected. Pins 1, 4, and 6 are
the Carrier Detect, Data Terminal Ready, and Data Set Ready data lines,
respectively. Unless you are using some funny software on the host computer
which expects a modem to be attached, everything will work fine.

Howard Henry Schlunder

 

[Si Ballenger]

On Fri, 12 Sep 2003 17:38:50 +0000 (UTC), "coulyo"
<nomail@btinternet.com> wrote:

Hello all,
I want to build a PIC project which can be found here
http://www.piclist.com/techref/piclist/cheapic/alphabet.htm
My question : is it necessary to connect pins 7 & 8
and pins 1, 4, and 6 as shown in the picture in Alphabet.asm,
since all we are using are send and receive (pins 2 & 3) ?
Tia

If you are using win95/98 and plan to echo characters to the com
port, you will need the extra wiring. You can echo in XP with out
problems. Other methods of sending to the comport may not need
the extra wiring.