Help to use this library with an anemometer ultrasonic
carminelau opened this issue · comments
hello everyone,
I use an ESP32 S3, a MAX485 and an ultrasonic anemometer via RS485. I would like to replace the current library with this one but I cannot figure out how to make it work.
Can anyone help me out ?
Manuale Anemometro.pdf
and this is my pinout:
DI: 6
RO: 7
RE: 4
DE: 5
You will not need to use two pins for RE and DE, just connect both to a single GPIO. Serial1 should be set up to use GPIOs 6 and 7. The single pin for RE/DE must be given with the definition call for your ModbusClientRTU. The begin call then will have Serial1 as parameter and off you go - normally 😁
can u send me an example ?
Have a look at the ModbusClientRTU example in the docs that has some explanations with it.
Closing this as it seems to be not relevant any more.
Hi, sorry to reopen this issue, but as I have only just started working with esp32 and RS485 can you write me a complete example ? In the example you tagged me I cannot understand the token what it is
I am afraid the new example would not look much different from that I linked in the last post. The documentation you found it in has much more information on the mechanisms working - you will want to invest some time reading and understanding it.
The token is a mark you will define and supply to the call, that you can use to identify the request to a received response. It can be any uint32_t number you like - 1, 4711, whatever. You send it with your request and you will get it back in the response/data/error handler. Imagine you are sending a bunch of requests to several different servers; all responses will end up in your one handler function, so you need to tell for which request the current response was received.