Hello, i’m trying to connect my x20cp0484 to a third party device for RGB lights ; the controller for RGB only accepts RS485 commandos has anybody some startcode to share ? i’ve tried the dvframe library but the external controller doesn’t reacts. i have the x20bb53 socket in my project. thanks…

Hello Sven, welcome to the Community! First, DVFrame is the right choice to develop a communcation via a serial interface to a 3rd party device. To get a serial communication up and running does not only depend on the right settings of the interfaces itself, but depending on the communication par…

Oh wow, the interface definitely tries to send. Is the RS485 line terminated at both sides? Any possibility to ground both systems to the same potential? (from the PLC side, there’s the RS485 GND Pin for that) Best regards!

Hello, i did a recheck on wiring and nothing was wrong, Both lines are terminated; I staring to thing this project will not work with B&R equiment ;-( i cannot find any more code examples thank for all the help Sven

Wiring looks good; lines are terminated… And the Physical View’s IF1 Configuration shows these? [image] Two coding topics stand out as strange to me: We know the device needs to communicate using Modbus RTU. From the look of the terminal output, this device uses the ASCII mode rather than the RT…

Hello, DO you think i should use the DRV_mbus library? i did allready disable the parameter Modbut RTU parameter. i"m also have a hard time to get the library working :slight_smile: what value did you use for the delimters? do you have some code snippet avail? with regards sven

Many people swear by the DVFrame library. Let’s just say I don’t have as much success using that library as using DRV_mbus. (For example, @corne.geerts says delimc/delim[0]/delim[1] are only used for receiving data – I wouldn’t know because I never got that far in using DVFrame. And when I read the …

Before you try the DRV_mbus library sample, can you trace your FRM_writeAcknowledged_0.status variable to see if that function block returns any error code briefly beside the constant 65535?

Hi @GeneShiau , it’s an interesting idea to use the modbus library instead of DV_Frame, I’ve never tried this together with the usecase to send a raw string / raw data. Therefore I’ve some questions to your remarks: I can’t see anywhere a hint that the device is a modbus RTU device? By the termi…

Hello, i wil try this one today lets hope ! sven

Hello, it only shows this value sven

@SvenG , can you please check if you have the latest firmware and Automation runtime running? If not, could you please update: PLC firmware PS firmware Automation Runtime Unfortunately I don’t have the same hardware, but I played around a bit and I had some issue where I’m not sure where it’s co…

RS485 communication x20 series

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alexander.hefner (Alexander Hefner) May 15, 2024, 1:08pm 38

Hi @SvenG,

nice to hear, happy that I could help.
Let the lights flash!

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RS485 communication x20 series

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