Micro 820 serial communication

I have micro 820 (2080-LC20-20QWB) . I need it to communicate with Arduino.Can I use Modbus serial ? I think voltage level is different(not checked yet) , I can manage it using a IC (Max).

if I need to send a string massage to a arduino from PLC , how can I use CCW?
thank you

In general, you can use the Micro 802 as a Modbus RTU protocol "master", and use function blocks to read and write Modbus protocol registers in a Modbus RTU "slave".

The Micro 820 serial port has a screw-terminal connection with both RS-232 and RS-485 signal levels available.

These are not directly compatible with the TTL signals on most Arudio UART ports. You need a shield or plug-in converter to RS-232 or RS-485.

Which Modbus library are you running on the Arduino ? Which model of Arduino ?

thank you very much for support I wish to use Uno board . could I know if I use MOD_BUS message function block in CCW how set parameters and what need other function blocks?

thank you

still I don't have specific mod bus library

Chapter 5 may help

https://literature.rockwellautomation.com/idc/groups/literature/documents/um/2080-um005_-en-e.pdf

Any possibility of using a RaspberryPi rather than an Arduino? If you can use something like a Pi, I can help you communicate with it via Ethernet I/P

geniusintraining and dmroeder thank your support. \

geniusintraining, your pdf only mentions how to configure modbus serial , but I need to know how use function blocks for mod-bus serial communication

dmroeder , I am interesting to RaspberryPi, but 820 have only one Ethernet port, event it doesn't have USB port. therefore if i go with pi I have to get network switch. first up all I need to write complete PLC side , i need to know function block usage

if any body know it please help me

It would help to know what task or purpose is being done by the Arduino board.

How far is the Arduino from the Micro 820 ? In general, RS-232 signals are good for about 15 meters.

Several vendors make RS-232 shields for the Arduino Uno form factor:

https://sha256systems.eu/RS232-Shield-for-Arduino/en

https://wiki.seeedstudio.com/RS232_Shield/



The standard library for Modbus on the Arduino is ArduinoModbus:

https://www.arduino.cc/en/ArduinoModbus/ArduinoModbus