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Author Topic: Help identifying pinout on tablet pc digitizer  (Read 70385 times)
27618349
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« Reply #45 on: July 02, 2013, 01:17:20 AM »

So you'll never guessed what happened.

I had my multimeter on the voltmeter setting (not ammeter).


Now, it yields around 8 mA while idling, and 27 mA when the pen is brought near. PHEW

When I ground pin 12, the current draw jumps to 28 mA.
When I ground pin 9, the current draw jumps to 25 mA.

Looking at the info on the wiki, the fact that grounding pin 12 causes a current jump is interesting. Does this mean it's serial?

EDIT: these numbers are all with Pin 11 unconnected to 3.3V

EDIT 2: I noticed that when I set Pin 11 back to 3.3V, the current drops out entirely. No power drawn. Otherwise, setting every other pin to 3.3V yields no current changes. I'm pretty sure this board is serial now. Can I simply wire it to a serial RS232 connector and plug it in a computer and have it work? (given drivers)
« Last Edit: July 03, 2013, 03:31:31 AM by 27618349 » Logged
kitor
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« Reply #46 on: November 24, 2013, 05:48:58 PM »

Hi!
I have Wacom SU-025-C01 taken from HP TC4400 (12"). It's working internally on serial (has pins 1, 9 - 14 connected). On 1 and 14 there's GND, 13, 12, 10 - 3.3V (measured on ribbon from laptop, not connected to wacom).

Oh, and it has got ZD1 soldered! I'm attaching photo of circuit board here

I'm trying to connect this to PC. As it uses 14 pin connector, I tried to connect to USB. After connecting 1,2,14 to GND, 13 to 3.3 or 5V, 3 to D- and 4 to D+ nothing happens. Does that mean that this one is RS232 only? If so, anyone succeded to use penabled tablet on RS232 connected to regular PC? I'm asking because when i disconnected it from TC4400, it's still visible in device manager, only with exclamation mark.


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