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PIC MODBUS
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dyeatman



Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK

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PostPosted: Tue May 21, 2013 8:50 am     Reply with quote

Are you modifying the modbus.c file?

The word at the end of the USE RS232 lines should be ERRORS not ERROR.
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RF_Developer



Joined: 07 Feb 2011
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PostPosted: Tue May 21, 2013 9:01 am     Reply with quote

It's "errors" in my (v 4.132) modbus.c.

So, what CCS version are you using Magnus?
magnus



Joined: 09 May 2013
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PostPosted: Tue May 21, 2013 12:45 pm     Reply with quote

I'm using 4.078 version.
But if I change word "ERROR" to "ERRORS" it works.
thanks for the tips, they really help me Very Happy
dyeatman



Joined: 06 Sep 2003
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PostPosted: Tue May 21, 2013 1:09 pm     Reply with quote

If you had to change the word you are not using the original MODBUS.c file
I would be careful of other possible changes.
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magnus



Joined: 09 May 2013
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PostPosted: Wed May 22, 2013 7:45 am     Reply with quote

Do You recommend some Modbus master simulator?
yerpa



Joined: 19 Feb 2004
Posts: 58
Location: Wisconsin

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PostPosted: Wed May 22, 2013 2:35 pm     Reply with quote

I've had good luck with MDBUS by Calta Computer Systems.

I use B&B Model 485USB9F-2W converter that plugs into Windows USB port and provides two-wire RS-485 connections.
magnus



Joined: 09 May 2013
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PostPosted: Tue May 28, 2013 9:46 am     Reply with quote

Hello again.
Now I'm testing with a internal software and It presents the message: Check Sum error.
What error is it?
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Tue May 28, 2013 11:18 pm     Reply with quote

Checksum is used in MODBUS ASCII protocol, RTU has CRC. Maybe you are using wrong MODBUS mode.

Generally, you can review any detail in the MODBUS over serial line specification, see modbus.org.
magnus



Joined: 09 May 2013
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PostPosted: Wed May 29, 2013 5:16 am     Reply with quote

Thank You! Very Happy
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