Problem 4 Xbee S1 and serial cominication base station

Projects Programming
1

I did decide to request for any budy to help in my project that is getting too complicated, and explained below. I have to transmit the temperature of 4 sensors (thermocouples) and each uses a operational amplifier (AD595)that is analog, each sensor operate with a Arduino Pro adn xbee maxstream s1 1mw, to send the data to a station which displays the data in a LCD 20x4. To differentiate each sensor, I use what we call a flag - Serial.print("D")- before sending temperature. My problem is how to differentiate each sensor using serial communication and display correctly. If you have any ideas, suggestions, link, recommendations, would help me a lot.

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To differentiate each sensor, I use what we call a flag - Serial.print("D")- before sending temperature.

How does using the same value on each Arduino differentiate them? I'd use D1, D1, D3, etc. to make it clear which one was sending the data.

Of course, if you use API mode, the packet already contains unique sender data.