Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's

Thanks Dave M, I'll break out the meter and scope. Already made a cable
with the correct pin outs and crossovers and still does not work. In fact
that was the first thing I did, before I spent the money on a new cable. I
have not checked the plug at the plotter. Will try that as well.

Sincerely,

Victor A. Estes

----- Original Message -----
From: "caedave" <caedave@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, October 03, 2005 7:04 AM
Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's


> You can't as such, it's a case of find the fault, correct it and
> the error goes away.
>
> Unfortunately I/O errors can be a nightmare to fix.
>
> Turbo's (the other Dave) message has some pointers but
> start out by checking the pin outs and Dip settings, if they
> are correct then it's time to get the meter and scope out
> so you can check continuity, pulse timings and levels.
>
> Try to also check these within the plotter so that you know
> the plugs are making good connections (been caught by this).
>
> Make up a plug with the correct crossover connections for
> the comms status. With this plugged into the plotter if you
> still get the error then at least you know the fault is something
> to do with the plotter.
>
> Dave M.
>
> ----- Original Message -----
> From: "Victor A. Estes" <emc3zach@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Sunday, October 02, 2005 7:47 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's
>
>
>> Dave,
>> Thanks, it's has to be the I/O error. Any idea how to reset a I/O error.
>>
>> Victor
>>
>>
>>>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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>>
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> OFF Topic POSTS: General Machining
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> if you have trouble.
> http://www.metalworking.com/news_servers.html
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> 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.
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> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
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