Do you have an example circuit...differential bus

I'm looking for an example circuit of a differential bus transceiver using something like a sn75176a

It can be any ic from any manufacturer that is a differential bus transceiver.

I mainly ask because people here and on other forums want to do long distance data runs and this seemed to be a solution and I also have a need.

Thanks.

[edit]May have found it http://www.airborn.com.au/layout/232to485.html
They've made it very easy.

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