EPICS CRC issues using Modbus/asyn on 64bit Linux

Experimental Physics and Industrial Control System

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Subject:	CRC issues using Modbus/asyn on 64bit Linux
From:	Ralph Lange <[email protected]>
To:	EPICS Tech Talk <[email protected]>
Date:	Thu, 01 Mar 2012 18:29:30 +0100

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 Mark Rivers; Re: CRC issues using Modbus/asyn on 64bit Linux Martin L. Smith

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