Re: [CAD_CAM_EDM_DRO] Re: Interface on low-cost linear scales?

Hi Tom.

My scales are the digital-out type and I knew the functions on the differnet pins but couldn't figure out what the bits meant. It was maybe something wrong with my oscilloscop (digital memory type) or the wiring when I analyzed the signals, I ddn't get any stable readings (different bitpatterns with the same readings on the scale). But I think I found what I needed in the Caliper_Info files.

/Halle

----- Original Message -----
From: <mayfiet@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, March 04, 2003 5:25 PM
Subject: [CAD_CAM_EDM_DRO] Re: Interface on low-cost linear scales?


> The vast majority of Linear Scales, output
> a quadrature signal, either Analog or Digital.
>
> Most Digital Output units will have 4 wires...
> Gnd, +5V, A Output and B Output.
> The outputs being standard logic TTL or CMOS
> levels.
>
> The Analog units can have 4 but usually 6 wires.
> Gnd, +Vcc, A+ Output, A-Output, B+Output
> and B-Output
>
> Analog levels can very from microvolts to
> several volts. These are usually sine waves.
> Some are Open Collector Outputs, so if you
> apply power and still don't read an output,
> you may have to use pull-up resistors.
>
> In either case your going to have to figure
> which pins are Gnd and Vcc first.
> This will probably require opening up one of
> the units and figuring it out or drawing a
> schematic.
>
> Also there might be a clue as to the
> manufacture on the circuit board.
>
> Good Luck
>
> Tom M.
>
>
>
>
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