Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's

>From: "caedave" <caedave@...>
>Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
>To: <CAD_CAM_EDM_DRO@yahoogroups.com>
>Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>Date: Fri, 30 Sep 2005 12:01:18 +0100
>
>Took a look on HP's site (Not the best to navigate around) and
>did eventually find some info on the 7475's including full pin out
>listings, Dip switch positions, test procedures and setting up.
>
>Limited amount on the error codes (lights) listed below.
>
>1. Error light dim, slow blink :-
> Plotter not active but performing power management.
>
>2. Error light on steady :-
> View Button pressed or plotter in paper load mode
> (Pinch wheel lever Up)
>
>3. Error Light fast blink :-
> I/O error, Paper jamb error, HP-GL error.
> For these it then references certain sections of the manual.
>
>Dave M.
>
>----- Original Message -----
>From: "Tom Harrison" <TomH-CNC@...>
>Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>
>
> > Don't forget: It also flips data receive and transmit (pins 2 and 3).
> >
> > Try this: using a digital voltmeter, measure the voltage at pins 2 and 3
> > using pin 7 as a reference. The one with an active negative voltage
> > (between -5 and -15 volts) is the pin the device is using to send data
>out
> > to the world. On your plotter and on your computer (use a 9-pin to
>25-pin
> > convertor if necessary), they must be on different pins to communicate.
> > Then apply jumpering if necessary, to satisfy the RTS/CTS and
>DSR/DTR/DCD
> > requirements of each end.
> >
> > Realize also that some interfaces actually USE the other control signals
> > to
> > throttle data flow so as to not overwhelm buffers. Not all use the
> > character-based throttling, like XON/XOFF and the like.
> >
> > More details if you need....
> >
> > Tom Harrison
>
>
>
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