RS-485 failure to operate

Added by Mark Lyon about 13 years ago

Using a MityDSP L178 with industrial IO board 80-000268RI-2
Trying to use RS-485 via J504 - there are no signs of life on any of the pins - even tried manipulating the GPIOs directly. Any ideas?
Note: We were able to toggle other GPIO lines that come out the connectors on the back.

Replies (1)

RE: RS-485 failure to operate - Added by Gregory Gluszek about 13 years ago

Hi Mark,

My initial inclination would be to make sure that the pinmux is set correctly. Section 11.5.10 in the OMAP-L138 Reference Guide has more details on this if you haven't already verified these settings.

Are you trying to communicate through these pins on the DSP or the ARM?

\Greg

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