RE: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's

HI Victor,

The HP note sounds correct (of course). If I can wade through the cables
behind my desks over to the plotter, I'll see what I can find out, and I'll
also try your HP instructions.

I'm sure all my pens (even the brand new ones in sealed bags) are dried up!
Ok for a test, 'tho. I could watch that plotter for hours.... (now I watch
the CNC'd Sherlines. ;>)

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: Thursday, September 29, 2005 9:31 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>
> Alan,
>
> Thanks, I'll give your suggestions a try. I hope to have some pics
> and
> drawing done up next week of the drag knife and then I can send them to
> you.
> Several other people have expressed interest as well. I have to get on
> the
> road tonight and will not be back in town until Sunday night, the reason I
> will not get to it until next week.
>
> On the blinking error light, it does it even with no cable attached to
> the computer. I thought that maybe it was blinking because I did not have
> a
> cable hooked up to it and it had some buffered command that it was trying
> to
> send out. But hooking up the cable makes no difference, even when trying
> to
> send commands through DOS to the plotter.
>
> My computer indicates that there are no problems with the COM1 port,
> so
> I at this point I can only assume that the port works, but the plotter is
> not responding to any input from the computer.
>
> What I tried and how I tried it came from the HP web site and is as
> follows:
>
> ISSUE: How can I determine if my cable and RS 232 port is working?
>
> SOLUTION:
>
>
> The easiest way to test communications to the HPGL pen plotter is from the
> DOS prompt. Use the following instructions:
>
> 1.. Verify that the HPGL pen plotter is at the factory default settings.
> See the HPGL pen plotter User's Guide for these settings).
>
> 2.. Close all programs and place the cursor at the C:\> prompt.
>
> 3.. At the prompt, type mode com1:9600,n,8,1,p and press ENTER.
>
> 4.. When the cursor returns to the DOS prompt, type echo
> in;sp1;pd4000,4000;sp0;pg; >com1 and press ENTER.
>
>
>
> NOTE: If connected to com2, substitute com2 for com1 in the above two
> statements.
>
> 5.. After pressing ENTER for the second statement, the HPGL pen plotter
> should grab pen #1 and draw a diagonal line. If the HPGL pen plotter does
> not respond, verify that a HP cable is being used and test by replacing
> the
> cable to see if the cable is defective.
>
> 6.. If communication with the HPGL pen plotter is still not established,
> contact Hewlett Packard hardware technical support.
>
> Number 6 is pay for support.
>
> On the drag cutter I basically took a pin from the plotter, removed the
> guts, turned a holder to fit in the pin, with a bearing and a magnet to
> hold
> the blade in. I'll have the pics next week.
>
> Thank You
>
> Victor
>
>
>
>
>
>
>
>
> ---- Original Message -----
> From: "Alan Marconett" <KM6VV@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, September 29, 2005 10:30 AM
> Subject: RE: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>
>
> > Hi Vector,
> >
> > It could very well be a NULL modem cable that's required. I was hoping
> to
> > find my manual last night, but failed.
> >
> > I still have it cabled up to one of my older computers and a serial
> > switch,
> > so that would be a way to verify what is needed. And the dip switches
> > will
> > be set up, probably 9600 baud for me.
> >
> > If the LED is blinking, then it didn't like one of your commands. You
> > might
> > route the plot commands to a file (still 7475 format), and see what they
> > look like. First char for initialization is an ESC (which doesn't print
> > very well in a text file), then two more characters, like I copied in my
> > email. Then possibly one or two more initialization codes, and then
> plot
> > commands.
> >
> > From DOS, you can "copy" a valid PLT file to the plotter, and that is a
> > basic test. Baud rate must be set up, of course.
> >
> > I'd be curious how you made a drag cutter out of a 7475 pen.
> >
> > 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: Thursday, September 29, 2005 6:20 AM
> >> To: CAD_CAM_EDM_DRO@yahoogroups.com
> >> Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
> >>
> >> Alan,
> >>
> >> According to everything I have read on the plotter a NULL Modem
> cable
> >> is
> >> required. So I went out and bought a new serial cable with a null
> modem
> >> adaptor. Still does not work. This was after I tried making my own
> >> cable
> >> based on the pin outs that I had read would work, no joy. I set the
> baud
> >> rate, parity, stop bits, and everything on the dip switches just as I
> had
> >> read was the thing to do from several different web sites on turning a
> >> 7475
> >> into a vinyl cutter. I'm running windows xp and the driver for it is a
> >> HPGL/2 driver which I understand will not work. Has to be a straight
> >> HPGL
> >> driver, windows 3.1, 95, and 98 have it. But I thought I would try
> >> anyway
> >> to see if I could get any response fro the plotter. When I failed to
> get
> >> it
> >> to respond out of windows xp I switch to the DOS window and tried to
> the
> >> direct commands by activating the COM1 port, still no joy. So I am
> still
> >> at
> >> a loss here. In my original post I did not mention that I made a real
> >> neat
> >> drag knife holder for the plotter out of one of the original pins. I
> >> want
> >> to try vinyl cutting with it. If I cannot get that to work then I want
> >> to
> >> take it apart and make the eggbot.
> >>
> >> Victor
> >> ----- Original Message -----
> >> From: "Alan Marconett" <KM6VV@...>
> >> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >> Sent: Wednesday, September 28, 2005 6:01 PM
> >> Subject: 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
> >> >
> >
> >
> >
> >
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> [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
> if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for
> OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
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