Can''t Communicate. Help.
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Posts: 46,084
try inserting a diode between the ground leg and
ground on the 7806 it will raise the output about
the voltage drop of the diode a 1n4001 should
bring it up around 6.5 to 7v
--- Hal ALbach <halbach@f...> wrote:
> Hello Dennis;
> Did some basic tests & measurements on my BS2P
> connected to my
> Fujitsu Lifebook laptop. Voltages on Stamp Pins 1,2,
> & 3 are -2.6, -
> 5.5, and -5.5. (So much for an invalid level!)
> Scoped the ATN pin
> (3 on the stamp) during Identify and observed 4
> positive pulses of
> approx 20 ms duration each. I then isolated DTR from
> the PC to the
> Stamp ATN and got exactly the same indication you
> have indicated,
> loopback - yes, echo - yes, but nothing else. It
> appears that DTR to
> the ATN pin on your stamp has a problem. Using my
> DVM the -5.5 does
> raise to about -4.6 during the pulses but if you
> have a scope then
> you can verify DTR coming into the Stamp pulses to a
> positive value.
>
> Good luck, Hal
>
> --- In basicstamps@yahoogroups.com, Dennis Landwehr
> <djlandwehr@y...>
> wrote:
> > Hi Hal,
> >
> > Thanks for responding. This Rogue 'Stamp Stick
> 2SX' calls for a DC
> input
> > from 6 to 18 volts, derated at higher voltages
> because the on-board
> > regulator gets hot...my non-contact IR thermometer
> saw over 200
> degrees F
> > while I was running the original, working one off
> the 17V my 12V
> nominal
> > wall wart puts out. So I put a 7806 off-board to
> dissipate the
> heat, and
> > wound up with 5.88V or so, just below the 6V spec,
> on the Vin pin,
> which
> > is regulated down to 4.95V with an on-board reg.
> I have,
> naturally, tried
> > bypassing the 7806 temporarily, and running the
> thing off a 9V
> battery,
> > and neither gets the comms going or changes the
> 4.95V coming from
> the
> > on-board reg.
> >
> > I wondered too about my PCs ports or some damage
> there but since my
> two
> > PCs communicate with each other through a
> null-modem cable, and a
> serial
> > mouse works on the same port, I feel it unlikely
> that there's a
> problem
> > there. Also, on the Compaq running BS editor 1.33
> (Win 98) the
> loopback
> > and echo tests are passed at the start of the
> Identify routine, and
> I've
> > established that the various characters of the
> BeXPI phrase that
> gets sent
> > and echoed must be 'heard' by the PC, even at the
> -3V level, since
> if
> > there is no stamp connected it never gets past the
> "B".
> >
> > It's a frustrating puzzle. I'm still wondering
> how to find out
> exactly
> > how the Identify function works; just what
> characters are normally
> sent
> > and recieved to identify the stamp out there. I
> think the BeXPI
> might be
> > just the start of a longer sequence that is being
> aborted for some
> reason.
> >
> > --- Hal ALbach <halbach@f...> wrote:
> > > 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
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed.
>
=== message truncated ===
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ground on the 7806 it will raise the output about
the voltage drop of the diode a 1n4001 should
bring it up around 6.5 to 7v
--- Hal ALbach <halbach@f...> wrote:
> Hello Dennis;
> Did some basic tests & measurements on my BS2P
> connected to my
> Fujitsu Lifebook laptop. Voltages on Stamp Pins 1,2,
> & 3 are -2.6, -
> 5.5, and -5.5. (So much for an invalid level!)
> Scoped the ATN pin
> (3 on the stamp) during Identify and observed 4
> positive pulses of
> approx 20 ms duration each. I then isolated DTR from
> the PC to the
> Stamp ATN and got exactly the same indication you
> have indicated,
> loopback - yes, echo - yes, but nothing else. It
> appears that DTR to
> the ATN pin on your stamp has a problem. Using my
> DVM the -5.5 does
> raise to about -4.6 during the pulses but if you
> have a scope then
> you can verify DTR coming into the Stamp pulses to a
> positive value.
>
> Good luck, Hal
>
> --- In basicstamps@yahoogroups.com, Dennis Landwehr
> <djlandwehr@y...>
> wrote:
> > Hi Hal,
> >
> > Thanks for responding. This Rogue 'Stamp Stick
> 2SX' calls for a DC
> input
> > from 6 to 18 volts, derated at higher voltages
> because the on-board
> > regulator gets hot...my non-contact IR thermometer
> saw over 200
> degrees F
> > while I was running the original, working one off
> the 17V my 12V
> nominal
> > wall wart puts out. So I put a 7806 off-board to
> dissipate the
> heat, and
> > wound up with 5.88V or so, just below the 6V spec,
> on the Vin pin,
> which
> > is regulated down to 4.95V with an on-board reg.
> I have,
> naturally, tried
> > bypassing the 7806 temporarily, and running the
> thing off a 9V
> battery,
> > and neither gets the comms going or changes the
> 4.95V coming from
> the
> > on-board reg.
> >
> > I wondered too about my PCs ports or some damage
> there but since my
> two
> > PCs communicate with each other through a
> null-modem cable, and a
> serial
> > mouse works on the same port, I feel it unlikely
> that there's a
> problem
> > there. Also, on the Compaq running BS editor 1.33
> (Win 98) the
> loopback
> > and echo tests are passed at the start of the
> Identify routine, and
> I've
> > established that the various characters of the
> BeXPI phrase that
> gets sent
> > and echoed must be 'heard' by the PC, even at the
> -3V level, since
> if
> > there is no stamp connected it never gets past the
> "B".
> >
> > It's a frustrating puzzle. I'm still wondering
> how to find out
> exactly
> > how the Identify function works; just what
> characters are normally
> sent
> > and recieved to identify the stamp out there. I
> think the BeXPI
> might be
> > just the start of a longer sequence that is being
> aborted for some
> reason.
> >
> > --- Hal ALbach <halbach@f...> wrote:
> > > 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
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed.
>
=== message truncated ===
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