Slave Mode

[hallard]

Is there any implementation of a slave mode in the pipe ?

[giampiero7]

Hi,
In this fork:
https://github.com/sfera-labs/pycom-modbus
You can find slave functionalities for Modbus RTU.

It is not yet documented, but it is not hard to figure how it works.

The entry point is Serial.get_request(unit_addr_list, timeout) to call in a loop, where unit_addr_list is the list of addresses you want to receive requests for, and timeout is the time the method will wait for a request before returning anyway.

Once, you get a Request, you use its methods to read the request's data and send a response or an error.

Hope it helps...

[hallard]

Awesome, thanks, I'll try that ASAP

[johncaipa]

Hi, some can you share an example for slave mode functionality?

[johncaipa]

Awesome, thanks, I'll try that ASAP
@hallard @giampiero7 can you share a basic example for slave mode functionality? thanks

[giampiero7]

Hi @johncaipa ,
You can find an example here:
https://github.com/sfera-labs/exo-sense-py-modbus/blob/master/modbusrtu.py#L34

[kiran007francis]

Hai,

Board: Esp8266
IDE: uPyCraft V1.0

Hai,

My name is Kiran Francis and i am new to micropython. I have medium experiencein python and is currently working on project that involves modbus communication. We are shifting the entire code to micropython and i came across this library for modbus. But i am stuck with an error. Whenever i burn the code to esp8266, I get the following issue

Issue: MemoryError: memory allocation failed, allocating 8960 bytes

Do you know anything regarding this issue. I hope to get a reply from you soon.

Regards,
Kiran Francis