the baud rate on your computer must match that of the HP7475a. if
you are in DOS, use this command:
mode com1: 9600,n,8,1,p
you can also use hyperterminal
--- In Homebrew_PCBs@y..., "mlpapus1" <mlpapus1@h...> wrote:
> Hello there
> I wire the intreface the way they show on the HP info site
> i set the plotter and the computer the same way ,but when ii try to
> print a test page it print's one line and then it print's some
garbege
> and the error light start blink and stop's
> If i change the baud rate to the lowest (1200)it print's some lines
> and then overflow.what should i do to fix it ???
> Thanks
> Papas
>
>
> --- In Homebrew_PCBs@y..., "caveteursus" <j.walton@a...> wrote:
>
> > Pin 6 doesn't connect to anything on a DB9. I have a PIC16F84
> > talking with my HP7475a -- you just need TxD, RxD, Signal Ground
and
> > CTS hooked up (well, you don't even need RxD hooked up since the
> > HP7475a is just receiving.) For those of you who are
interested, I
> > just have a MAX232, pin 2 (+ 10V from the charge pump) to assert
> > a "SPACE" to pin 4 of the DB9.