CODESYS - the IEC 61131-3 automation software

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PostPosted: Thu Apr 20, 2017 1:08 pm 
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Joined: Thu Apr 13, 2017 8:01 am
Posts: 5
HTejada wrote:
ekmekci wrote:
Dear All,

This topic was so helpfull for me about getting data from usb via codesys.

I used, Edwin's example it works well. I can read data from my usb GPS receiver.

But, i wonder what if i have 2 usb device at the same time.
How we can control both of them at the same time ? It is possible to do it?

For example;
For one usb device we can use
FirstSerialLine(
slMode:= SL_READWRITE,
udiPort:= 1,
udiBaudrate:= 4800,
paParity:= COM.PARITY.NONE,
sbStopBits:= COM.STOPBIT.ONESTOPBIT,
udiByteSize := 8);

what we need to do for 2 usb device at the same time.

Thank you for your help.


if 2 usb are the same manufacture, you can change udiport:=2 for second device. You can create news string i/o for the second device.

Lucky!

BR
Hector.



Thank you for your help. But what if i use 2 usb devices which different manufacture ?
What i need to do.

Also, what is the mean "same manufacture" ? Could you please give example ?


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PostPosted: Thu Apr 20, 2017 5:57 pm 
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Site Admin

Joined: Mon Sep 05, 2005 9:42 am
Posts: 1898
Hi,
set symbolic links in Linux

Example:
/dev/ttyUSB0 -> /dev/USBCDS0
/dev/ttyAMA0 -> /dev/USBCDS1

and then in /etc/CODESYSControl.cfg only this line will be needed:

[SysCom]
Linux.Devicefile=/dev/USBCDS

BR
Edwin


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PostPosted: Fri Apr 21, 2017 12:28 pm 
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Joined: Thu Apr 13, 2017 8:01 am
Posts: 5
Edwin Schwellinger wrote:
Hi,
set symbolic links in Linux

Example:
/dev/ttyUSB0 -> /dev/USBCDS0
/dev/ttyAMA0 -> /dev/USBCDS1

and then in /etc/CODESYSControl.cfg only this line will be needed:

[SysCom]
Linux.Devicefile=/dev/USBCDS

BR
Edwin



Thank you Edwin,

I will try and i will let you know,


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PostPosted: Tue Apr 25, 2017 5:33 am 
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Joined: Thu Apr 13, 2017 8:01 am
Posts: 5
Edwin Schwellinger wrote:
Hi,
set symbolic links in Linux

Example:
/dev/ttyUSB0 -> /dev/USBCDS0
/dev/ttyAMA0 -> /dev/USBCDS1

and then in /etc/CODESYSControl.cfg only this line will be needed:

[SysCom]
Linux.Devicefile=/dev/USBCDS

BR
Edwin


Dear Edwin,

I did what you said.
Everything works perfect now.

But i have one question about serial com structure.

For example, i have GPS receiver. When i power up the receiver, gps datas comes regularly every one second.
I wonder, it is possible to understand there is data which coming or not.
I mean, according to your example we alwasys try to reading comport every 250ms randomly. If there is data we can get the data if there isnot data we still read comport every 250ms.

Is there any indicator which tell us data is coming or data has come.

I hope i explained well.


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