two serialports

Using Arduino Programming Questions
1

Hi guys.
I have an problem. I have an PLC i communicate with using modbus rtu with an MAX485.
I'd like to connect an second bus to the arduino so the arduino is like an integrator box connecting two busses. One connected to PLC and the other bus is an sensorbus connected to several sensors.
Se attached image .

Room BUS.png
Room BUS.png1380×1077 11.3 KB

2

cbrAndy:
Hi guys.
I have an problem. I have an PLC i communicate with using modbus rtu with an MAX485.
I'd like to connect an second bus to the arduino so the arduino is like an integrator box connecting two busses. One connected to PLC and the other bus is an sensorbus connected to several sensors.
Se attached image .

So what do you want? Help? Someone to write the code?

3

(deleted)

4

If you are using hardware serial ports for this, get a Mega and then you don't have to worry about softwareSerial.