ESP8266 Community Forum

- Fri May 29, 2015 6:38 am #18847 Hey,

I think it can work. The max 485 can handle to to 5v, and also 3.3v would not really be a problem. I do not know if the esp8266 is compatible with 3.7v or sometimes even more for li ion batteries.

Apart from that, my library is not included in nodemcu (the lua firmware). It is only a plain c library.

- Fri May 29, 2015 7:35 am #18858 Thanks andi,
perhaps to have more reliability should put a voltage regulator as :

http://www.ti.com/lit/ds/symlink/tps63031.pdf

The problem is that I thought the librery you wrote was in LUA.
Do you know if there are libraries in Lua (nodemcu) to handle the request Modbus rtu?
In your opinion is possibilile make porting from C to Lua (nodemcu)?

I attach some documentation of the energy meter.

Attachments

Eastron SDM120C Modbus RTU Protocol-1.pdf

(4.72 MiB) Downloaded 588 times

SDM120C_RS485.pdf

(773.69 KiB) Downloaded 525 times

- Wed Sep 23, 2015 12:58 pm #29709 Finally you could did it??? I am interested in this project

Thanks andi,
perhaps to have more reliability should put a voltage regulator as :

http://www.ti.com/lit/ds/symlink/tps63031.pdf

The problem is that I thought the librery you wrote was in LUA.
Do you know if there are libraries in Lua (nodemcu) to handle the request Modbus rtu?
In your opinion is possibilile make porting from C to Lua (nodemcu)?

I attach some documentation of the energy meter.