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Author Topic: PIC16F877 and Modbus  (Read 8807 times)
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kyawmyo
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« on: April 11, 2008, 04:45:23 04:45 »

Hi,
I am trying to develop an application that will interface with RS485 for Modbus protocol. Could anybody give me useful information regarding with PIC 16F877.

Rgds
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enen
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« Reply #1 on: August 07, 2008, 04:58:49 16:58 »

Hi ,
firstly Pic16f877 is not enough memory for Modbus.

you should 14f852 or more memory size pics.
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jorge7458
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« Reply #2 on: August 07, 2008, 07:07:10 19:07 »

The modbus is not a complex protocol and he would not have inconvenience by heart with a 16f877. he would Be necessary to see that it is what is wanted to send.   
Jorge
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j0k3r
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« Reply #3 on: August 07, 2008, 11:27:47 23:27 »

Look on the folder examples from the CCS compiler for the files:
ex_modbus_slave.c
and
ex_modbus_master.c
they have what you want.....
and, yes they use a
Code:
#include <16f877a.h>
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microtest
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« Reply #4 on: August 21, 2008, 07:29:30 19:29 »

exelent i am now testing it and post my schematic next time
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arash_tah
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« Reply #5 on: November 30, 2009, 05:52:04 05:52 »

Hi mikrotest I want to connect my micro to PLC via MODBUS do u have any idea?
can u share your sch and any detail in this regard
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