hi,
i want to start a new project in which i want guidance regarding how to read the energy flow from the meter using rx tx pin.
*what are the things required to implement the code and read the live flow of energy through rx tx pin.
*i have arduino mega 2560 to use as micro controller but other things that are required for implementation which i am not sure what to buy ?
*some of things i have found through google named like max 232,rs 485 full,half duplex but do not understood which one to go for ?
*is there any code example to test the things?
Well, that does narrow it down drastically. At least he water meters with different pin markings are out.
Do you happen to have a crystal ball for me? Maybe it can tell you what meter you have. That failing, part numbers and links to data sheets and so may be helpful.
meter in the attached image is almost same type and it is custom designed.
yes, it read flow rate and which i can see from the display on the meter
it has rs 485 connecter on the opposite side of display thats all i know.
Ransher:
i think i need a max 485 and modbus rtu example thats all??
That's a good start.
But first you should give a call to whoever built this thing for you, and let them explain how to communicate with it. Baud rate, protocols, command set - the works. When you have all that (getting this information may turn out your biggest problem - don't buy anything before you have it!), you can start trying to make a connection and hopefully end up with a complete library that you can use in your project(s) that deal with this meter.
