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ISO3082: DMX RDM SPLITTER
Part Number: ISO3082
i come back to you for my DMX RDM splitter
with your i have make a prototype in hard
and there is something not run
i need your help for a second time, because i'm not avaibale to find a good issue
attached the final schematics
it run only if C26 470nf is not present
when i use my RDM console, the discovering of LED project is done and i can change or read some parameter
i think the Frg is not good
pls help me
philippeSPLITTER DMX RDM - TOP - 1.pdfSPLITTER DMX RDM - BOTTOM.pdf
SPLITTER 3 x ISO3082.pdf
Thanks for following up on this! Glad to hear from you again. Sorry your prototype is not working as intended.
Could you clarify a few things for me?
Thanks and best regards,
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In reply to Dan Kisling:
In reply to philippe cavalier:
I reviewed your schematics a little more in depth. I have a few follow up questions:
With regards to your layout I also have a few concerns. In order to have galvanic isolation there cannot be any traces or components in the isolation boundary between the left side and the right side of the device. For more information on this please see the layout guidelines in the ISO3082 datasheet and refer to the Digital Isolator Design Guide.
CdC4ch DMX RDM - REV G 01072018 - BOTTOM.pdfCdC4ch DMX RDM - REV G 01072018 - TOP.PDFhello dan
thanks for uour help
IC8 is the IC connected to the CYPRESS processor IC by " RX / RX EN / TX EN / TX"
as i told you this part run correctly
IC12 is like you said, for DMX status led
if the SPLITTER componants no on the board, i keep R26 / R27 / DDKKK3 and the jumper 1 and 2 are instaled, and like this the DMX signal go directly on IC8
some tests done
when i connect 2 DMX RGBW led board on the splitter it run, the RDM console read and write data on the RGBW board, but only if C26 not present
that i do not understand is the operati,g mode of the NA555 without C26, so strange
your other question was the supply voltage
there is a complete separted DC supply by DC1 so there is VCC and GND, and VCC DMX and GND DMX, like the net label
this is what i can say today
i do not understand why it not run
i thought a frequency problem donne by IC15 because the application note was not build for DMX signal
if you need a little movie i can do
attached the PDF 3D of the final DMX RDM board
best regards DAN and thanks
Could you try the following:
We can take a look at the oscilloscope waveforms and determine if the monostable-configured NA555-timer oscillator is working as we would expect.
Philippe, Have you been able to acquire scope waveforms as suggested by Dan? -Lucas
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