Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's

Hi... I just seen your post, and if it helps, it is a "null" cable that you will need. I have on that I used to use to plot my drawings, but now is just collecting dust on the shelf! I do have manuals and if you need any specific information, just let me know and I will do my best to pass them on.

Russ

"Victor A. Estes" <emc3zach@...> wrote:
Alan (KM6VV), Tom H., Dave M., and anyone else I may have missed,

First off, thanks for all of the help in trying to solve my plotter
problem. I still have not been able to get it to respond to any commands
from the computer in DOS, or Basic, or Windows. Even though the plotter
will power up and perform it's demo plot with no problem. And still have
the blinking error light that will not reset. The manual talks about
getting error information from the plotter using ESC commands, but I have
not been able to figure that one out. It says that ESC.E should report back
what the error is causing the blinking light. But I am too inept to get it
to work I guess.

So will keep trying and probably scrap it for the servo's for a future
eggbot project. In the meantime I picked up several steppers that I will
initially use in my eggbot project. Vinyl cutting will have to come later,
or use the cutter on my mill.

Which brings me to the cutter. I have pics and a description of the
cutter for you guy's and anyone else who would like to see it. But as luck
would have it, I wanted to upload the photo's on the group site, but I
cannot find a link to create an album and upload the photo's. So if someone
would tell me how to do it I will, or provide your direct email addresses
and I will email to you directly.

I would like to see if this cutter works, there is no reason that it
should not, but it still would be nice to see it actually work.

Let me know guys, and sorry about the delay, I am also a procrastinator.

Sincerely,

Victor A. Estes
emc3zach@...

----- Original Message -----
From: "Alan Marconett"
To:
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"
>> To:
>> 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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