CODESYS - the IEC 61131-3 automation software

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 Post subject: Modbus RTU RS485
PostPosted: Sat Oct 11, 2014 4:04 pm 
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Joined: Wed Feb 27, 2008 7:35 pm
Posts: 13
Hi,

iam searching for a MODBUS RTU Lib with RS485 Support.

I have an TTL -> RS485 converter on the Raspi, but i must switch the send/recv by a output.

The Converter is standart at recv an wen the Modbus Master sende they musst switch it.


Have anyone a idear?


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 Post subject: Re: Modbus RTU RS485
PostPosted: Tue Oct 21, 2014 1:31 pm 
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Joined: Wed Feb 26, 2014 5:48 am
Posts: 52
Hi!

Long time I'm using simple transistor + 75176 IC, bit I believe it can be also max486. It switch automatically independent of speed (I test it with 230kbs and it work). If you able to make your pcb I can send you schematic if you like.


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