RE: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's

Hi Victor,

Are you sure a NULL MODEM cable is required? I have a 7475A plotter. I
probably haven't plotted with it for 10 years. There is also a switch for
baud rate, as I recall. Insure that you are talking the proper baud rate,
parity, stop bits, etc. (which I'm sure you've already checked).

I wouldn't mind finding a 7475 plotter that I could experiment with as you
describe! I even started an EGGBOT project a few years ago.

Alan KM6VV

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Victor A. Estes
> Sent: Wednesday, September 28, 2005 3:06 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>
> Has anybody had any experience with HP's 7475 Plotter servo's. I have an
> old hp 7475 plotter that seems to work (demo prints) but has a
> communication problem with my computer. Was wondering if any one has used
> these servo's in other projects? I.E. hooked them up to a servo controller
> and ran them off of another program such as EMC or one of the others? If
> I can't get the plotter to talk to the computer I would like to salvage
> the servo's and use as something else. The plotter has a constant
> blinking error light that will not reset, and does not seem to be
> communicating with the computer. I hooked up a new serial null modem
> cable, but still am unable to get the plotter to respond to the computer
> commands through DOS and the COM1 port.
>
> I was thinking of maybe using the servo's in an egg decorating machine. I
> saw one on a CNC art web site.
>
> I know the servo's work because from the control panel I can make the
> plotter pick up pens and also do the demo plot.
>
> Any Suggestions?
>
> Victor
>