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Author Topic: PIC Modbus Communication  (Read 14566 times)
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kyawmyo
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« on: April 14, 2008, 09:12:39 09:12 »

Hi,
Currently, I can get a lot of info about RS232 communication Via PIC, but very rare to see about RS485 and modbus. Could someone help me to get such information?

Regards,

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SKUPAD
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« Reply #1 on: April 14, 2008, 12:49:45 12:49 »

Attached files may help reg. MODBUS communication.

Thanks.
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Bitburner
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« Reply #2 on: April 15, 2008, 04:41:07 16:41 »

Here's a great reference manual/bible for most all communication standards that you may end up designing around, while uC developing.

Practical Data Communications for Instrumentation and Control
http://rapidshare.com/files/107698221/practical_Data_comunication.pdf.html

It should help you quite a bit.

Also, here is a good little software for testing with while you're troubleshooting MODBUS. The DEMO mode is Beg-ware, but full functionality (only limited to the number of modbus messages allowed). I'll post a keygen once I track one down.
http://www.simplymodbus.ca/index.html
 

Good luck,
Bitburner
« Last Edit: April 15, 2008, 05:04:52 17:04 by Bitburner » Logged
kyawmyo
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« Reply #3 on: August 06, 2008, 04:50:05 04:50 »

Again!
Have you got any MikroC source code to implement modbus protocol for dsPIC chip?

Rgds.
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titi
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« Reply #4 on: October 12, 2008, 11:02:02 11:02 »

Hello,
Here is a exemple of implementation of Modbus RTU protocol in a PIC16F874.
This code is not from me but from WWW.MODBUS.PL
It could be a usefull to start.
Best Regard.
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waicon
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« Reply #5 on: May 20, 2009, 12:34:17 12:34 »

.... MODBUS communication.....
any info for Fbus that use in nokia phone ?
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bogdantk
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« Reply #6 on: May 21, 2009, 08:01:23 08:01 »

Fbus a a whole different bus - electrical and data protocol.
Check the board. There were some post related to Fbus hardware.
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waicon
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« Reply #7 on: May 21, 2009, 06:52:20 18:52 »

M-bus and f-bus different ? interesting, would like to share data protocol ?

i've little info on fbus, modified USB to serial cable to comm nokia, suscess to collect some phone version info but sent / received sms vs fbus still not working, below link collected from web
http://cid-43d920b8e0e97821.skydrive.live.com/self.aspx/Public/electronic/abhi%7C_FBUS.pdf
 

 
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Parmin
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« Reply #8 on: May 22, 2009, 01:23:17 01:23 »

waicon,  you are off topic!

Modbus is data streaming protocol for CNC or other machine control.
M-Bus and F-Bus is Nokia's data protocol for serial communication.

totally different stuff..
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waicon
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« Reply #9 on: May 22, 2009, 05:41:18 05:41 »

ooh...i understand now, modbus & m-bus are differance, thanks for teching me.
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ALLPIC
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« Reply #10 on: May 22, 2009, 05:55:36 05:55 »

Is there any one who know modbus RTU master sample code? I am working on that but haven't success

thanks in advance
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