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RS485 code

 
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minds



Joined: 29 Aug 2008
Posts: 1
Location: Ch

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RS485 code
PostPosted: Fri Aug 29, 2008 3:49 am     Reply with quote
Hi

I need sample code for RS485.


please help me
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Fri Aug 29, 2008 4:00 am     Reply with quote
Hello,

it uses standard RS232 function with an ENABLE=pin pin option to drive the transceiver (75176 or similar) output enable. A convenient option is to use the transmitter enable also as receiver disable (with a pullup resistor at the procssor RxD pin) to supress reception of your own TX data.

The peers are required not to send simultaneously, this has to be achieved by the protocol. If you use e. g. MODBUS, it is guaranteed by the respective driver.

Regards,
Frank
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Fri Aug 29, 2008 8:01 am     Reply with quote
C:\Program Files\PICC\Drivers\RS485.C
C:\Program Files\PICC\Examples\ex_rs485.c
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