Hi Steve,

Thanks for your aswer. I live in Brazil, and here we have 10X of diference between this IC's.

Other problem is the delivery time. SN75 we have in many suppliers, but for Maxim IC's we wait until 45 days to delivery...

I request some samples of DS1487. It can drive 128 nodes and the price is 1/2 of MAX487. It can solve my problem.

But I still want to know if we can make a repeater connecting "back to back".

Best Regards and Happy New Year !!!