Just measured the output  pins on desktop RS232 ports:
Pin 3 TXD: -11V
Pin 4 DTR: -11V
Pin 7 RTS: -11V

So DTR output negative (-11V) voltage by default.
I am curious is there a way prevent Tera Term change DTR pin to Posigve (+1=
1V)=20
voltage?

 Funny N.
Au Group Electronics, http://www.AuElectronics.com
http://www.AuElectronics.com/products
http://augroups.blogspot.com/




________________________________
From: Funny NYPD <funnynypd@yahoo.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sent: Fri, February 18, 2011 7:08:42 PM
Subject: Re: [EE]Tera Term PC serial port DSR voltage change.

I believe DSR and DTR are a pair, not sure which one is an input to PC, whi=
ch=20
one is an output from PC.
Is there are way on Tera Term to set the output pin to Negative voltage, e.=
g.=20
-5V~-10V?

Funny N.
Au Group Electronics, http://www.AuElectronics.com
http://www.AuElectronics.com/products
http://augroups.blogspot.com/




________________________________
From: "William "Chops" Westfield" <westfw@mac.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sent: Fri, February 18, 2011 3:30:13 PM
Subject: Re: [EE]Tera Term PC serial port DSR voltage change.


On Feb 18, 2011, at 11:53 AM, Funny NYPD wrote:

> I just found the Tera Term will set RS232's DSR pin at "8.9V" by =20
> default on my
> desktop PC.
>
> Is there a way to have the Tera Term set DSR at "-8.9V"?

Isn't DSR an input on the computer side?  The PC is usually considered =20
the DTE...

BillW

--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist



     =20
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist



     =20
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.