Experimental Physics and
Industrial Control System

Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> · Tue, 14 Feb 2023 20:44:26 +0000

If the device uses Ethernet rather than a serial port you need to add:

- xxx_DBD+=drvAsynIPPort.dbd

Mark

-----Original Message-----
From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Pierrick M Hanlet via Tech-talk
Sent: Tuesday, February 14, 2023 1:03 PM
To: tech-talk at aps.anl.gov
Subject: Re: Help getting modbus module started

Hi Christian,
You will also need to add some things to your xxxApp/src/Makefile:
- xxx_DBD+=modbusSupport.dbd
- xxx_DBD+=drvAsynSerialPort.dbd
- xxx_LIBS+=modbus

I think that this should do it for you.
Good luck,
Pierrick

On 2/14/23 11:38, Christian Pauly via Tech-talk wrote:
> Hi folks
>
> I am trying hard to set up a Raspberry running an EPICS IOC for a 
> Delta VFD motor driver / frequency inverter. The device is controlled 
> via modbus, using a large set of individual 16bit integer read/write 
> registers for configuration, and few more registers for control.
> At the moment it is configured to talk Modbus ASCII via RS485, and 
> with a simple Python program using minimalmodbus-lib i can talk to the 
> controller.
>
> Now i started with a fresh EPICS 3.15.7 base, (in ~/EPICS/base) and 
> installed ASYN-R4-43 (~/EPICS/modules/asyn-R4-43) and modbus 
> (~/EPICS/modules/modbus_R3-2).
> I initiated a new application ~/EPICS/projects/FUcontrol, ran 
> "makeBaseApp.pl -t example FUcontrol", "makeBaseApp.pl -i -t example 
> FUcontrol" - and thats basically it.
>
> And now i am stuck how to include modbus (includes / libs / dbd files) 
> into my exampleApp.
>
> I kind of managed to include ASYN already by adding
>   ASYN=... to the RELEASE file
>
> and to the Makefile:
>   FUcontrol_LIBS += asyn
>
> In my ioc startup st.cmd i can run the commands 
> drvAsynSerialPortConfigure("RS485", "/dev/ttyUSB0", 0, 0, 0) to 
> configure the interface.
>
> But if i add
> modbusInterposeConfig("RS485",2,1000,0)
> i get an error on startup claiming that modnusinterposeconfig can not 
> be found.
>
>
> So:
> Is there any simple step-by-step instructions how to add modbus to an 
> existing ioc application ?
> I could not find anything "simple" in the documentation. I saw the 
> examples which come with modbus, but all these already look quite 
> complicated to me...
>
> Or any good advise on how to continue from here ?
>
> Thanks for any help !
>
> Christian
>
>
>
>
>

--
Pierrick Hanlet
Fermi National Accelerator
Accelerator Front End Controls
+1-630-840-5555 -- lab
+1-312-687-4980 -- mobile

"Whether you think you can or think you can't, you're right" -- Henry Ford

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System