Hello everyone.
I'm trying to only read data from a MPPT solar regulator with arduino.
The device has a "rs232" port, but the connector is a RJ12, with 6 pins. The specifications of the device states: "Communication: RS232". I upload an image of the pin distribution. 
How can I adapt this signal to a Arduino?
The device has also a RS485 port, would this be easier to use?
@guitobenito, your topic has been moved to a more suitable location on the forum as you're not interfacing with a PC 
RS232 uses different signal levels and they are inverted. You will need a converter, e.g. based on MAX232. Search for Arduino TTL to RS232 or for Arduino RS232. You will need the sigal pins 1, 2 and 3 of your image.
For RS485, you will also need a converter; search for Arduino TTL to RS485 or Arduino RS485.
Both should be equally easy from a hardware pespective; RS485 will be a little more complex from a software perspective.
Note: just picked two boards from the SparkFun website; there are others.
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