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Can''t Communicate. Help. — Parallax Forums

Can''t Communicate. Help.

ArchiverArchiver Posts: 46,084
edited 2003-03-22 15:49 in General Discussion
I'm wondering why you are applying 6 volts to the stamp unless it is
to the Vin pin for it's own on board regulator (if your version has
one). Direct input to Vdd per the manual is 4.5 to 5.5 Volts. Also
I think -3 volt RS232 signal is very close to invalid. Sounds like
maybe your soldering event damaged the original "stick" which may
have damaged your PC port. If you can, try to do a complete external
loopback test on your PC Comm port to insure that ALL pins are
functioning properly.

--- In basicstamps@yahoogroups.com, "djlandwehr" <djlandwehr@y...>
wrote:
> Hi. I'm new to the group so forgive me if this has been covered, or
> please refer me to earlier posts my searches missed.
>
> I bought a "Stamp Stick 2SX" from Rogue Robotics based on the
> PArallax Stamp 2SX, on a 30-pin SIM type PC Bpard w/proto space.
All
> was fine, many programming iterations until my hamhanded soldering
> finally messed something up and it no longer communicated.
>
> I got another, and now a third, and neither of them has ever
> been "identified" by my Compaq 1245 win 98 running BS Editor 1.33
> (same as had worked on stick #1). I have connected only DC power
> (through a 7806 regulator for +6Vdc normally, also from a 9v
battery
> or 12V nominal (17V actual) dc wall wart for tests), and the 4
> straight through comm lines (Sin, Sout, ATN (reset), and Ground to
DB-
> 9 pins 2,3,4,&5 as Rouge specifies (and worked earlier).
>
> I have also tried Stamp2sx.com in a DOS window and on an older
> 486sx33 laptop I resurrected for the purpose. I made another DB9
> with clip leads connected to pin 2 & 5 (input * ground) so I
> can "listen" to the serial characters sent to & from the PC and
> stamp. During the V1.33 'Identify' routine the PC sends, and the
> Stamp Echos (both at 9600 baud) the characters B,e,X,P & I
(commas ,
> ampersand & spaces added) and the identify window says "Loopback
Yes,
> Echo Yes, but no device type or version.
>
> The RS232 voltages are nominally OK (-3, -7, -7 or so for Sin,
Sout,
> and ATN, rising during 'identify')
>
> I've tried all I can think of to no avail. Again, this is the
> second, maybe third stamp stick affected. I've tried changing
> stamps, software, computers (and the two computers were able to
> communicate serially with each other, so the ports seem OK). Any
> help would be appreciated.
>
> DJlandwehr
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