Low cost TTL to RS485 converter schematic board.

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U. Dreher

Hi,

your example employs isolation. Plus an isolated power supply.

If isolation is not required, there is quite a number of RS-485 or RS-422 chips. The effective interface converter in your schematics is the part marked ''75176BD".

If you want to use a ready-made board: search for "RS485 shield" and buy what you like. I found boards starting at 2.50 EURos but there may exist even cheaper ones. Typically you will also find schmatics for these boards on the vendors' sites.

Wish you success.

Bruno Senzio

Looks like you are using isolation on your module...

Have you searched for LTC1535? One piece is 6.65 USD on some websites though...

http://www.linear.com/product/LTC1535