Re: [CAD_CAM_EDM_DRO] Hp 7475 Plotter Servo's

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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