B4R Question Wemos & rSoftwareSerial


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Hi all,
I am using a Wemos as a wifi server communicating with an android tablet. The tablet sends commands to the wemos to switch leds, relays etc..
I also need to communicate via RS232 from the wemos to a cnc controller. I have built a Max3232 TTL to RS232 converter.
If I use rSoftwareSerial to connect to the Max3232 how do I know if the data that is recieved in the buffer is from the wifi connection or the rSoftwareSerial port?