Hi, I have read this page: https://www.victronenergy.com/live/victronconnect:mppt-solarchargers#load_output, chapters 4.2 and 4.5 but I am not sure about this question.
I want to use an arduino/esp8266/... to log data from my MPPT 75/15 solar charger controller.
So I need to connect TX and GND pins to my arduino.
I want also use the RX pin of the MPPT to control load output state from my Arduino.
Is it possible? What will be the correct settings in the MPPT?
And for Arduino, I have to output down RX to 0V == switch load output off, and to output up to +5V == switch loadout on .
But what about this sentence: "(or a signal sent via VE.Direct communication)". does it mean that I could write and HEX command to RX to switch on or off my MPPT load output?
If RX could recieve signals, I understantd the MPPT have to "wait" time to confirm the pull down or up of RX that I have said in previous paragraph?
Please, could any of Victron's employee explain us step by step?
Option 1: use with 0 or 5V, (if I use a 3.3V signal, could RX pin of MPPT detect 3.3V as HIGH ?
Option 2: use by sending commands from arduino to MPTT.
Option 1 is simplest for me, that I must ensure that I am understading it well.
Thanks a lot.