About RWedu.1

RWedu.1 · 2021-02-10

I have configured the UART for multiprocessor communication over RS485. I can receive and transmit data correctly, but if the data contains a '1' as MSB it is interpreted as an address. Now it is clear from the documentation that this is the correct ...

RWedu.1 · 2020-10-20

I'm looking to make a loop of MCUs as slaves to a PC master so that I can send commands to them. The idea is to use the https://www.maximintegrated.com/en/products/interface/transceivers/MAX22025.html and https://www.ftdichip.com/Support/Documents/Da...

RWedu.1 · 2021-07-21

Sorry, for B I use 10kOhm pull down of course :D

RWedu.1 · 2021-07-21

Between the STM and MAX i have simply TX<->TX, RX<->RX(using both even if its half-duplex. The STM is configured to RX and TX), and 3V3<->VDDA. The RS485 bus side is supplied(VDDB) by the PC through to USB cable linked above. I use two 10kOhm pull up...

RWedu.1 · 2021-07-21

I ended up doing multiprocessors communication with addressing actually and implementing my own protocol over UART. I'm working on it now after leaving this project for a while. Do you still want more details or were you interested in the Modbus part...

RWedu.1 · 2020-10-21

That makes sense, thank you! Does this mean that the TX pin of the MCU should be connected to both the RXD and TXD pin of the transceiver? I see that it requires the TXD pin to be high to be able to receive data:

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Multiprocessor mode with address mark detection only receives data which has '0' as MSB. After waking up (RWU=0) when the correct address is received subsequent bytes should be received normally, and not interpreted as another address?

Modbus over RS485 with STM32F303K8

Re: Modbus over RS485 with STM32F303K8

Re: Modbus over RS485 with STM32F303K8

Re: Modbus over RS485 with STM32F303K8

Re: Modbus over RS485 with STM32F303K8