Anyone know what signal it is?

[xoom]

Hi, im trying to start tumble dryer machine motor (ASKOLL TA0200). Which is BLDC with integrated BLDC driver.. That dryer is missing main control board.. I hooked up logic analyser to that motor to see if it spits out any data.. and sure it does. but i dont know what it is.. To me it looks like it sends 8 bytes, but still with strange gaps. And it repeats same 8 bytes every 200mS. Maybe somebody know what signal it is and maybe know how to start it? what data need to be sent to this motor..

Dryer model is : ARISTON HOTPOINT AQC9 6F7 TM

[ebclr]

It's high probability to start bit + 7 bits, Try to decode with saelig, measure the smallest width on the beginning from there you can calculate the baud rate

[xoom]

Baud rate looks like standard 9600. but still it shows framing error..

[xoom]

Screenshot with decoder

[Dave]

It looks to me like you need to invert the signal before decoding.

[Simon]

But your probing a motor output, how does that help with giving it an input to make it work? Lots of bldc motors do feed back their speed.

[xoom]

Hi Dave,
you was right

Now it decodes just fine now biggest problem is what it wants to receive to start motor )
On board there is FSB50550US

[Simon]

If it's 7 bit numbers being exchanged maybe it just takes a number from 0 to 100 to mean percent of top speed.

[xoom]

But your probing a motor output, how does that help with giving it an input to make it work? Lots of bldc motors do feed back their speed.

becouse i dont have main board to probe what it sends to motor.. atleast now i know that its basic serial interface. and now is biggest problem to find any info what need to be sent to motor to control it. would be good that one of ASKOLL employee be here if that info can be shared

[xoom]

If it's 7 bit numbers being exchanged maybe it just takes a number from 0 to 100 to mean percent of top speed.

it not reacts to numbers tryed to send some..  maybe it expects for some initilisation then start command..

there is small PIC controller which drives that module ( FSB50550US)

[xoom]

any suggestions where or how to look for that kind info?

[Simon]

Well unless the input signal goes to a specific chip that has a datasheet that lists the comms specification you might be a bit stuck. Obviously a PIC can be programmed to do whatever.

[xoom]

would be nice to find datasheet for that motor.. i think they are same for all appliances that uses this motor.. but maybe also can be modified by request.. i see there is programming port for that PIC..

[xoom]

im thinking maybe i can use other bldc controller from ebay.. but problem is that they all are low voltage.. and i guess this motor uses something like 300VDC maybe someone know suitable controller?

[xoom]

looked up that PIC.. its : DSPIC33FJ16MC101-I/SS

[xoom]

Or maybe one of hackers have Gorenje dryer?

(not my photo)
The model is: GORENJE D8666N, LINK to supplier

[xoom]

Pinout of motor controller board.
RX - Motor transmits
TX - Motor receives

[rstofer]

Have you tried '?<enter>' or 'help<enter>'?  I can't imagine it working but you never know.  Had I coded the thing, I might have included such a feature just for bench debugging.  That the controller talks back gives some indication that their is some kind of interactivity.

[xoom]

Have you tried '?<enter>' or 'help<enter>'?  I can't imagine it working but you never know.  Had I coded the thing, I might have included such a feature just for bench debugging.  That the controller talks back gives some indication that their is some kind of interactivity.

Yes i tried those. I was connected with terminal program and was trying to send similar stuff no response.. now looking if someone have similar appliance with same motor and can sniff some data out of main board (not many hopes but still)

also thinking to rewind that motor for example for 24V and use BLDC driver from ebay.. i already spined it with ESC here is video: BLDC

[xoom]

one more quick question..

before i was unable to decode signal i needed to invert it.. when inverted i was able to decode.. now im thinking maybe TX signal i also have to invert..?

(thats mean optocoupler diode allways on.. and only off when bit is sent)

or its never done like that?

[xoom]

Ended up Rewinding motor for lower voltage

[stevewind77]

I have the same motor in my Haier HD70-A82 dryer.
I just tooked it apart because it is not spinning anymore.
I could check what is sent to the motor, maybe I can understand where the problem in my case is.
You can then send the same commands to your motor and who knows, maybe it starts to run :-)

[stevewind77]

Today I checked the communication.This is what sends the main controller to the motor:
FE 18 06 F3 1E 18 0F 86 86 06 00
9600 8N1 inverted signal 5V.
My motor is not answering at all. :-(

[06Navara]

Hello,
Even it's and very old topic, I want to put the solution for the others in here.

I have a Whirlpool HSXC 40920 dryer, and need also to know how it's the communication made.
When I was trying to measure the signal by the oscilloscope it made a big short circuit, maybe because
the levels of voltage is not raised from absolute reference ground (GND, 0V, the case, PEN, etc...) but its a difference
between potencials, raised up to the power supply voltage (230V or around that).

I was expecting that there is a 0-5V TTL logic levels, but there was so big higher voltage.
(or there were an other error, i don't know... in any case, touch of GND wire of oscilloscope to "ground" wire
at the wires between main PCB and PCB of BLCD motor made huge short circuit. Main PCB was dead.
Vdd and Vss on the PIC is connected together somewhere on the PCB).

Now I have ordered a new main PCB, and when it comes to me, will replace the broken one by the new one
(and I hope so there isn't any other parts of dryer broken. Fortunately the BLCD motor was disconnectet in that time).

For first information:
 - PIC is using the UART 1-TX, UART-2RX, which is on pins 9 and 10.
 - The communication wires is connected not only to PCB of BLCD motor. It's also connected to touch-screen board.
So there may be even a packets between main PCB and this panel.
By this, I'm not sure that the bytes you captured is bytes for the motor. May it be also bytes for the touch screen.

Further informations will comes next week, when the main PCB will be replaced.

[06Navara]

Hello,
the new main PCB was installed and I'm trying to listen to the wire.
I'm using an optocoupler and at his other side the Saleae Logic listener.

Only three wires is used for connection between main PCB and BLCD driver.
There is only one communication wire, other wires is power supply and the ground.

Here is a creen from Saleae logic listener.
There is several messages which is send by main PCB, and they are continuously repeated.

Someone may be addressed to the control board, someone for the BLCD.
This messages was recorded when I push the start button and the dryer have to
send an message to the motor to start rotating.

I will try to separate the unique messages from the listening and try to send to the motor
and we will see if someone of them is the right command for the BLCD driver.