EPICS Home

Experimental Physics and Industrial Control System


 
1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: RE: CRC issues using Modbus/asyn on 64bit Linux
From: Mark Rivers <[email protected]>
To: "'Ralph Lange'" <[email protected]>, EPICS Tech Talk <[email protected]>
Date: Thu, 1 Mar 2012 17:46:32 +0000
I should add that the CRC is only used on Modbus serial RTU, not on Modbus TCP or Modbus serial ASCII.

So 2 questions:

1) Has anyone successfully run Modbus/asyn serial RTU on 64bit Linux?

2) Has anyone run the Wave P6100 temperature controller with Modbus/asyn serial RTU on any architecture?

Mark


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Ralph Lange
Sent: Thursday, March 01, 2012 11:30 AM
To: EPICS Tech Talk
Subject: CRC issues using Modbus/asyn on 64bit Linux

Hi,

I am reliably getting CRC errors on the device's answer when reading
more than two parameters (Modbus code 3) through serial RTU on RS-485
from a Wave P6100 temperature controller. The data itself looks good and
reasonable.
One or two word access (Modbus code 1 or 3) seems to work fine.
The IOC runs on 64bit Linux, using Mark Rivers' Modbus on ASYN driver.
(All from synApps 5.5)

Has anyone seen similar behaviour?
Does anyone successfully run Modbus/asyn on 64bit Linux? (To rule out 64
bit issues in the CRC checking part.)

Thanks for any help,
~Ralph



Replies:
RE: CRC issues using Modbus/asyn on 64bit Linux Emma Shepherd
References:
CRC issues using Modbus/asyn on 64bit Linux Ralph Lange

Navigate by Date:
Prev: Re: BOY FAQ Benjamin Franksen
Next: RE: Epics gateway writeNotify issue Hill, Jeffrey O
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: CRC issues using Modbus/asyn on 64bit Linux Ralph Lange
Next: RE: CRC issues using Modbus/asyn on 64bit Linux Emma Shepherd
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  <20122013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024