Help with communication please
Archiver
Posts: 46,084
Hello,
I have been trying to use the SERIN/SEROUT commands to communicate a
byte-size number between two stamps. Been using the "baudmode" #
16780 and stamps wired with "open-source" circuit (single
communication pin between uP's with this pin tied to VSS thru 1k ohm
resistor).
Not getting the same number thru to the reciever uP, most times
getting nothing thru at all. Any suggestions would help me out.
Thanks! -Brian Dalziel Milwaukee, WI USA
I have been trying to use the SERIN/SEROUT commands to communicate a
byte-size number between two stamps. Been using the "baudmode" #
16780 and stamps wired with "open-source" circuit (single
communication pin between uP's with this pin tied to VSS thru 1k ohm
resistor).
Not getting the same number thru to the reciever uP, most times
getting nothing thru at all. Any suggestions would help me out.
Thanks! -Brian Dalziel Milwaukee, WI USA
Comments
is different depending on what chip you are using. I went from the BS2IC to
the BS2P40 and was chasing my tail until I noticed the difference..
Mike B.
Original Message
From: "signaltech_99" <bdalziel@e...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, September 02, 2002 6:58 PM
Subject: [noparse][[/noparse]basicstamps] Help with communication please
> Hello,
>
> I have been trying to use the SERIN/SEROUT commands to communicate a
> byte-size number between two stamps. Been using the "baudmode" #
> 16780 and stamps wired with "open-source" circuit (single
> communication pin between uP's with this pin tied to VSS thru 1k ohm
> resistor).
>
> Not getting the same number thru to the reciever uP, most times
> getting nothing thru at all. Any suggestions would help me out.
>
> Thanks! -Brian Dalziel Milwaukee, WI USA
>
>
> 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/
>
>
Make sure your Stamps are connected ground<->ground.
Make sure your receiving Stamp is looking for data when the
transmitting Stamp is actually sending it. Sounds trivial, but it
can be a challenge sometimes.
Try simplifying your code to find some instance that works, then
build upon that.
Also, baud mode 16780 is not an open baud mode. 16780 + 32768 =
49548 corresponds to 2400, 8 bit, no parity, inverted, open
(source). However, 16780 should be working fine--even with your
pulldown resistor in place--for your described one-way transmissions
(with both states driven), so this probably isn't the problem.
Suggestion: connect the Stamp I/O pins via ~100 ohm resistor until
you get this sorted out. May save you some expensive damage by
limiting the current that can flow between your Stamps.
Regards,
Steve