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:rrutzke@web.de]
Gesendet: Montag, 27. Mai 2013
10:05
An: Jim Hart;
openapc@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@gmail.com>
An: openapc@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
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