Modbus example in 18F452

rfreddy · Joined: 03 Jun 2007 Posts: 7

Hi,

I have Modbus example running correctly for 2 16f877 as master and slave.

Now I tried to port slave's code to a 18f452 and my master now gets only exceptions, it seems to be that there is no data sent or received from the slave.

Does anybody have a running slave for this kind of pic or anybody could point me if I'm doing something wrong?

I think I'im having trouble with 452's interrupts handling because the slave doesn't process any request using INT_EXT or INT_RDA options. I have browsed for any idea and people who had problems with serial interruptions always had their rcv/xmit ports misconfigured, that is not my case. :(

Any help will be appreciated.

Thanks in advance,

Freddy

Olivera · Joined: 09 Oct 2008 Posts: 2

Hi Freddy.

I have been trying for a long time to implement the modbus on 2 pics but I have failed. May you do me the great favor to share you master and slave code? I would be geat to me...Thaks in advance. my email is:
marcos.olivera@gmail.com

dyeatman · Joined: 06 Sep 2003 Posts: 1923 Location: Norman, OK

Olivera,
If you are a CCS user both the MODBUS master and slave code can be found in the CCS Examples directory

Olivera · Joined: 09 Oct 2008 Posts: 2

I lost the examples code. if you can help me with the modbus code and it`s working would be great. Thanks in advance anyway...
xxxx@gmail.com

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