modus rtu setup Byte 5 and 6

[OpenAPC Project Group]

Roman,

without digging into MODBUS protocol and exactly  checking every byte of the
sequence you have shown here: the missing bytes are the data bytes, means they
are influenced by the data you set at the input of the MODBUS-plug-in. In other
direction - when you receive some data - these bytes are changed from your
device, there they contain the data you read from it.

--
Kind regards

Jim Hart

http://www.lasermarkingsoftware.com
http://www.openapc.com

Follow us at Twitter: https://twitter.com/#!/openapc

AW: Re: modus rtu setup Byte 5 and 6

[Ralf Blicker]

Hi Roman,

 

i’m using modbus with openapc an atmels. Maybe i can help you. Give me
al call.

I think it’s easier for you to speak native german.

 

Ruf mich unter Null 2872/8090 Zehn an.


Ralf Blicker

  _____  

Von: Roman Rutzke [mailto:[e-mail]] 
Gesendet: Montag, 27. Mai 2013 10:05
An: Jim Hart; openapc(a)lists.fedorahosted.org
Betreff: Aw: Re: modus rtu setup Byte 5 and 6

 

Hi Jim,

 

thank you, for your fast response.

Refering to your tip i tryd some things in my modbus project.

I extended it with 2 Number_Fields and the following connections.

Number_Field_1 OUT7 ---> Number_Field_2 IN7 (just to see Field_1's
Output)

Number_Field_1 OUT7 ---> Modbus RTU Master IN0

When i run the project now, i can change the conntent of Number_Field_1
and

also i can see the changes in Number_Field_2.

If i correctly understand your tip, i would expect to see changes in the
serial port monitor.

In my case i would expect "01 02 00 00 Number_Field_1 as HEX CRC"?

But unfortunately ther is no influence between Number_Field_1 and serial
output,

i just see 01 02 00 00 00 20 CRC. (00 20 is evertime constant)

Do you have any idea what else i can do to resolve my problem?

 

Best regards

Roman

  

Gesendet: Freitag, 24. Mai 2013 um 11:30 Uhr
Von: "Jim Hart" <openapc(a)gmail.com&gt;
An: openapc(a)lists.fedorahosted.org
Betreff: Re: modus rtu setup Byte 5 and 6

Roman,

without digging into MODBUS protocol and exactly checking every byte of
the
sequence you have shown here: the missing bytes are the data bytes,
means they
are influenced by the data you set at the input of the MODBUS-plug-in.
In other
direction - when you receive some data - these bytes are changed from
your
device, there they contain the data you read from it.

--
Kind regards

Jim Hart

http://www.lasermarkingsoftware.com
http://www.openapc.com

Follow us at Twitter: https://twitter.com/#!/openapc
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