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it seems like the HB is not able to talk back to your PC. make sure
the TxD signal starting from the 'hc11 is leaving the HB properly at
the RJ11, reaching the interface bd, and then being cvt'ed to -10v to
+10v levels out the interface bd on its way to your PC.
f.
In your message you said:
> I recently finished collecting all the parts for the handyboard and
> started assembly. I went all the way through the i/c board setup without
> a hitch. But when I got to assembling the serial comm circuit a few
> things went wrong.
>
> I assembled the Serial Line and Stop Switch (4.4 if you're following
> the online assembly instructions on the mit site).
> The first part of the testing (4.4.2) went well: The BATT LED cycles on
> and then off. The PWR LED turns off when the BATT LED turns off. I
> connected the main board to I/C board through the phone cable. The HB
> goes into bootstrap mode - I turned it on while holding down the STOP
> switch. The PWR & BATT LEDs came on for a moment and both turned off.
> Tried downloading pcode_hb.s19, using hdbl but got an error. Typed dl
> pcode_hb.s19 but it timed out on serial receive. (mentioned 256 bytes
> remaining). IC tells me it cannot sync with the boardPlease press the
> reset button.
>
> Here's what I do know:
> The cable I'm using has the 2 and 3 pins switched (as required) and
> grounds connected. It's on COM1 of my pc (so no com problems).
> When I run 'dl pcode_hb.s19 -ignore_input' the program will go through
> and ignore all the serial echoes and so on and load into the HB. I
> believe this is true because when I then reset the HB the piezo beeper
> beeps at me (I went ahead and installed that as well) as it said it
> would.
>
> So basically, sending to the HB works, but getting anything transmitted
> from the HB does not happen. I believe this is true because the lights
> on both boards will blink as the program is loading into the HB, but
> they do nothing when the downloaders ask the HB to send something back.
>
> Has anyone run into this problem? Could it be a faulty MAX232 on the i/c
> board not letting communications through?
> Thanks for your help
>
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Message is in Reply To:
 | | HandyBoard Assembly
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| I recently finished collecting all the parts for the handyboard and started assembly. I went all the way through the i/c board setup without a hitch. But when I got to assembling the serial comm circuit a few things went wrong. I assembled the (...) (25 years ago, 9-Mar-00, to lugnet.robotics.handyboard)
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