about RS485 and MODBUS MASTER

Projects Programming
1

Hello guys..

first.. my english is not good. so.. forgivingly understand me please.

i have a big question about modbus protocol with RS485 shield in arduino.

i'm using power meter for check power of some electric device.

this device support RS485 2-wires and modbus protocol.

so i tried to receive values from this devices to arduino.

but... i tried every method in internet. but i can't receive values..

my spec is..

arduino : UNO
RS485 shield : http://s1.electrodragon.com/wp-content/uploads/2012/04/RS485_Serial_Module_Wiring.png

and

and i used this libraries :

tell me what to do..

rs485shield.png

rs4852.png

2

godqqq1:
Hello guys..

first.. my english is not good. so.. forgivingly understand me please.

i have a big question about modbus protocol with RS485 shield in arduino.

i'm using power meter for check power of some electric device.

this device support RS485 2-wires and modbus protocol.

so i tried to receive values from this devices to arduino.

but... i tried every method in internet. but i can't receive values..

my spec is..

arduino : UNO
RS485 shield : http://s1.electrodragon.com/wp-content/uploads/2012/04/RS485_Serial_Module_Wiring.png

and

https://cdn.sparkfun.com//assets/parts/9/9/0/6/12965-04.jpg

and i used this libraries :

https://github.com/4-20ma/ModbusMaster

tell me what to do..

have you done this project?