Echo''s on serial pins
Archiver
Posts: 46,084
If you are using Sin and Sout this is expected behavior. The Stamp
"steals" -12V from the PC which means only 1/2 duplex communications and the
PC hears everything it sends. You can read about it at
http://www.al-williams.com/wd5gnr/stampfaq.htm.
You can code around this problem or you can use another port. Our RS-1 kit
(http://www.al-williams.com/awce/rs1.htm) is very useful for breadboarding
with another port.
Good luck!
Al Williams
AWC
* NEW! Easy PIC programs: http://www.al-williams.com/awce/app2.htm
>
Original Message
> From: matt.ryan@p... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RIJzz6IjnTNrTlzRF7IOZRRpBsu5vHrM6JHoVclf6Ehn8tsLNXEww2I-rhV98AjILhq9YNG7aUq5wQ]matt.ryan@p...[/url
> Sent: Friday, August 31, 2001 4:37 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Echo's on serial pins
>
>
> Hi everyeon,
> I've got a BS2SX in my application, and am communicating to it via
> the Sin and Sout pins hooked to my PC. When I send communication to
> it, it hears just fine, but it seems to be echoing the received
> transmission on the Sout line. I've scoped the line, used
> hyperterminal, and a Visual Basic program to verify that it isn't
> just a ghost. I've also used two different stamps (both BS2SX), and
> the problem is still there.
>
> Am I missing something about the native serial port pins? Should I
> be pulling something else low? High? Has anyone else seen this?
>
> Thanks
> Matt
>
>
>
> To UNSUBSCRIBE, just send mail to:
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> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
"steals" -12V from the PC which means only 1/2 duplex communications and the
PC hears everything it sends. You can read about it at
http://www.al-williams.com/wd5gnr/stampfaq.htm.
You can code around this problem or you can use another port. Our RS-1 kit
(http://www.al-williams.com/awce/rs1.htm) is very useful for breadboarding
with another port.
Good luck!
Al Williams
AWC
* NEW! Easy PIC programs: http://www.al-williams.com/awce/app2.htm
>
Original Message
> From: matt.ryan@p... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RIJzz6IjnTNrTlzRF7IOZRRpBsu5vHrM6JHoVclf6Ehn8tsLNXEww2I-rhV98AjILhq9YNG7aUq5wQ]matt.ryan@p...[/url
> Sent: Friday, August 31, 2001 4:37 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Echo's on serial pins
>
>
> Hi everyeon,
> I've got a BS2SX in my application, and am communicating to it via
> the Sin and Sout pins hooked to my PC. When I send communication to
> it, it hears just fine, but it seems to be echoing the received
> transmission on the Sout line. I've scoped the line, used
> hyperterminal, and a Visual Basic program to verify that it isn't
> just a ghost. I've also used two different stamps (both BS2SX), and
> the problem is still there.
>
> Am I missing something about the native serial port pins? Should I
> be pulling something else low? High? Has anyone else seen this?
>
> Thanks
> Matt
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>