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check and re-check:

- PC configuration:
  * Number of Data bits.
  * Number of Stop bits.
  * Baud Rate.
  * Flow Control.
  * Parity.

- PIC Configuration:

  * Number of Data bits.
  * Number of Stop bits.
  * Baud Rate.
  * Bit 9 enable/disable.
  * SPBRG value.
  * Asynchronous/synchronous mode.


"Hartung, Greg" wrote:

>    I am transferring a project from wirewrap to etched PCB.  Each section of
> the wirewrap board is being moved to a separate module with pc/104 stackthru
> connectors.
>    Everthing was going fine until I got to the RS-232 section.  It uses the
> USART of a 16c774 and a Dallas ds275.  It is not identical to the wirewrap
> design, as I removed a switching relay because I no longer need to talk to 2
> devices, which makes it much simpler.  The wirewrap board works.  The etched
> board, however, transmits exactly the corect # of character (to a PC, no
> flow control, 115kbps), but they are the incorrect characters.  I put a
> simple "echo" program in the PIC to check.  I press an "A", I should get an
> "A" back, but instead I get some other character, but always the same
> incorrect chacter for a given key.  I checked the math to see if it was a
> simple pattern (bit 8 or something), but no pattern.  Some keys produce the
> same hex value.
>    I tried different chips, eliminating unnecessary modules (only the
> processor, PS, and serial boards are left), different bauds, and have
> checked the boards for shorts, etc.
>    Any ideas?
>    Thanks.
>
> Greg Hartung
>
> --
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