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Is 4diac support uart/serial? [message #1848465]

Fri, 03 December 2021 06:11

overmas zhang

Messages: 12
Registered: June 2021

Junior Member

I want to use RS232 & RS485 for communication, but I don't find any documentation.
Is CPosixSerCommLayer can be use? how?
If anyone knows, pls reply. thx a lot

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Re: Is 4diac support uart/serial? [message #1848468 is a reply to message #1848465]

Fri, 03 December 2021 08:44

Martin Melik Merkumians

Messages: 117
Registered: March 2016

Senior Member

Hi,

you have to activate the Serial Com Layer in CMake, and then use the Communication FBs for transmitting data (PUBLISH, SUBSCRIBE).
To configure your serial interface, you have to put the configuration parameters on the ID input on your Comm-FB "ser[<InterfaceName>, <baudRate>, <byteSize>, <stopBits>, <parity>]"

Please note, that his only configures the communication parameters, not the representation of data, which has to be chained as usual with a dot '.' and the next communciation layer.

Best regards,
Martin

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Re: Is 4diac support uart/serial? [message #1848500 is a reply to message #1848468]

Mon, 06 December 2021 01:26

overmas zhang

Messages: 12
Registered: June 2021

Junior Member

Thx a lot, but how to activate the Serial Com Layer in CMake?
In fact, I have used to try to modify "src/posix/CMakeLists.txt":
forte_add_network_layer(SER ON "ser" CPosixSerCommLayer posixsercommlayer "Enable Forte serial line communication")
and i see after complied, it has the file "./src/CMakeFiles/FORTE_LITE.dir/arch/posix/posixsercommlayer.cpp.o
"
but when I try to use it with a PUBLISH block with ID like:
ser[/dev/ttyAMA2,115200,8,1,0] or
raw[].ser[/dev/ttyAMA2,115200,8,1,0]

I just see that after init, it returns NO_SOCKET
:(

pls tell me what's wrong， thx

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Re: Is 4diac support uart/serial? [message #1848504 is a reply to message #1848500]

Mon, 06 December 2021 09:06

Jose Maria Jesus Cabral Lassalle

Messages: 16
Registered: January 2021

Junior Member

Parity should be one of the following (all caps):
- NONE
- ODD
- EVEN
- MARK

You also need an extra parameter at the end for the termination symbol, which should be one of the following (posix serial communication does not use this actually, but rather the windows one. Still this parameters needs to be there following the current implementation. You can try with $n):
- $n
- $r
- $r$n

So, the PARAM looks actually like ser[<InterfaceName>, <baudRate>, <byteSize>, <stopBits>, <parity>, <terminationSymbol>]

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Re: Is 4diac support uart/serial? [message #1848519 is a reply to message #1848504]

Mon, 06 December 2021 19:38

Alois Zoitl

Messages: 1585
Registered: January 2014

Senior Member

Also please don't modify the CmakeList.txt of 4diac FORTE core elements unless there is a bug in them. You can activate all the modules and communication systems during the cmake configuration step, either from the command line or from CMake GUI.

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