PROFIBUS Dev Kit RS485 on J504

Added by Mike Costa about 13 years ago

Hi,

The RS485 pins on J504 of the PROFIBUS Dev Kit seem to be directly connected to UART2 of the mitydspL138F which are labeled UART2. Are they TTL, or are they converted to RS485 on the mitydspl138F module?

Thanks,
Mike

Replies (5)

RE: PROFIBUS Dev Kit RS485 on J504 - Added by Thomas Catalino about 13 years ago

Hi Mike -

They are TTL and meant to ribbon cable to a small driver board that can be panel mounted to minimize stub length for PROFIBUS applications.

We may not have made that clear enough in the documentation and will take an action to clear that up.

Tom

RE: PROFIBUS Dev Kit RS485 on J504 - Added by Mike Costa about 13 years ago

Got it, thanks Tom

RE: PROFIBUS Dev Kit RS485 on J504 - Added by Mike Costa about 13 years ago

One more question on this...

I'm confused on the pinout of J504. the schematic that you guys sent of the dev board seems to not agree with the datasheet. see my pictures attached

Thanks
Mike

Download all files

J54041.png (101 KB) J54041.png
J5042.png (33.3 KB) J5042.png

RE: PROFIBUS Dev Kit RS485 on J504 - Added by Thomas Catalino about 13 years ago

Hi Mike -

You are correct, thank you for pointing this out. The table in the data sheet is from an older revision to the board before we moved the line drivers to an external, panel mounted (and currently customer supplied).

We will get the datasheet updated, I apologize for the confusion.

Thanks,
Tom

RE: PROFIBUS Dev Kit RS485 on J504 - Added by Mike Costa about 13 years ago

OK, thanks for confirming Tom

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