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Mmm.. okay, zero for two indicates a possible design or component issue.
The likely candidates are the MAX3237 and/or MAX3241E line drivers.

The MAX3241E looks a tad slow for this application -- no timing margin to speak of, really. I'm not sure about the MAX3237 -- there's an 'E' version of that chip which does look fast enough. I wonder which exact parts you have there?



All Es. They are the MAX3490ECSA+, MAX3237EAI+, and MAX3241ECAI+. Before buying, I upgraded the MAX3237 to the E version because it offers better ESD protection.

Stu
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