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RS232 [message #1791448]

Fri, 29 June 2018 14:25

Reza ELC

Messages: 5
Registered: June 2018

Junior Member

Hi,
I would like to read some data from the TX/RX of the Raspberry Pi and I don't see the RS232 communication FB in the 4diac. Is this discontinued in the latest version?
Thanks,

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Re: RS232 [message #1791576 is a reply to message #1791448]

Mon, 02 July 2018 15:13

Martin Melik-Merkumians

Messages: 104
Registered: March 2016

Senior Member

Hi Reza,

the last time I used serial communication, about two years ago, there was no dedicated FB for that. You just use the regular communication FBs, like Publish, to send data. (I am quite sure, as I implemented the serial comm layer for Windows and the associated RawDataComLayer)

If you don't need any special type of encoding, configure the comm FB to use the rawdata and serialcom layer. The configure string should look approx like raw[].ser[<your serial device>]

Best regards,
Martin

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Re: RS232 [message #1791581 is a reply to message #1791576]

Mon, 02 July 2018 15:42

Alois Zoitl

Messages: 1224
Registered: January 2014

Senior Member

Hi,

the same should work for linux. When you activate the posix architecture the sercomlayer should be available for selection in CMake.

Cheers,
Alois

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Re: RS232 [message #1791622 is a reply to message #1791581]

Tue, 03 July 2018 06:19

Jose Maria Jesus Cabral Lassalle

Messages: 199
Registered: February 2016

Senior Member

Hi,

The PARAMS data input is not only the name of the interface, but an array of strings like this:

raw[].ser[INTERFACE_NAME, BAUD_RATE, BYTE_SIZE, STOP_BITS, PARITY]

where:

INTERFACE_NAME: is the name of the file that will be use.
BAUD_RATE: Just a number according to the connection
BYTE_SIZE: Byte size of the connection
STOP_BITS: 1 for one bit, 2 for two bits, 3 for one comma five bits
PARITY: 0 for no parity, 1 for odd parity, 2 for even parity, 3 for mark parity (only windows), 4 for space parity (only windows)

So, an example could be:

raw[].ser[/dev/ttyS0, 115200, 8, 1, 1]

which will use the /dev/ttyS0 inteface, 115200 as baud rate, 8 bits byte, 1 stop bit and odd parity.

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