Summagraphics tablet?

From: Gerold Pauler <gerold.pauler_at_gmx.net>
Date: Tue May 4 04:52:01 2004

I have a SummaSketch MM1201 and the documentation for it.
The protocol doesn't match your description.
But maybe it helps a little bit anyway.

        Baud Rate: 9600
        # Start Bits: 1
        # Stop Bits: 1
        # Data Bits: 8
        Parity Bit: Odd

        Data Format:
        MSB bits LSB
        7 6 5 4 3 2 1 0

byte 1 1 PR 0 Sx Sy Fc Fb Fa
byte 2 0 X6 X5 X4 X3 X2 X1 X0
byte 3 0 X13 X12 X11 X10 X9 X8 X7
byte 4 0 Y6 Y5 Y4 Y3 Y2 Y1 Y0
byte 5 0 Y13 Y12 Y11 Y10 Y9 Y8 Y7

        F is the flag bit, identifying the stylus or
        puck buttons being pressed:

        Stylus Puck Binary Output
        Buttons Buttons Fc Fb Fa

        none none 0 0 0
        tip button 1 0 0 1
        barrel button 2 0 1 0
        tip and barrel 3 0 1 1
        - 4 1 0 0
        - 1+2 0 1 1
        - 1+3 0 1 1
        - 1+4 1 0 1
        - 2+3 0 1 1
        - 2+4 1 1 0
        - 1+2+3 0 1 1
        - 1+2+4 1 1 1
        - 2+3+4 1 1 1
        - 1+2+3+4 1 1 1

        Sy and Sx are the sign bits for the Y and X coordinates.
        1 is positive.
        0 is negative.

        PR is the proximity bit.
        When stylus or puck is in proximity, the bit is 0.
        When out of proximity, it is 1.

        X0..X13 and Y0..Y13 are the X and Y coordinates.


Gerold

der Mouse schrieb:
> Does anyone know, or know of a reference to, the serial-line protocol
> spoken by Summagraphics tablet digitizers (specifically, the MM1103)?
>
> I have one. After a bit of detective work, I got it to at least
> somewhat work. I now have it to the point where I can connect it up
> and turn it on. When I do, I get nothing until one of the buttons on
> the puck is pressed, at which point it starts generating a stream of
> samples, continuing for as long as some button is pressed. The format
> is fairly easy, just %04d,%04d,%1d\n sent with the 0x80 bits set to
> provide even parity, where the four-digit numbers are the location
> (based on an 8.5" edge of a piece of paper and some arithmetic, it
> appears to be 200dpi) and the last indicates what button is pressed.
>
> This makes it all at least somewhat usable. But I'd really like to be
> able to get samples back even when no buttons are pressed, whence my
> question.
>
> The back does include a sticker saying, among other things, "BIT PAD
> FORMAT", which may or may not mean anything useful. I did go
> a-googling, but either there's nothing to be found or I didn't guess
> the right incantation to find it. `Summagraphics MM1103 serial
> protocol' turns up no hits - though it probably will once this message
> gets archived and googled :) - and neither did `"bit pad format"'.
>
> It _is_ on-topic; there's a sticker on the back with a Date: field
> containing a handwritten date that is clearly in 1984 (it appears to
> read "10/17/84"), which contains other text implying it was added by a
> leasing/service organization.
>
> Thoughts?
>
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Received on Tue May 04 2004 - 04:52:01 BST