Hallo,
I also use this unit - and was looking into controlling the output. From what I learned so far :
- My box has a RS232 output, same board as shown in the last post from kmsj13 (the chip is a MAX3232).
- Could confirm the 4 pins being used (pins 2,3,5,9).
- On pin 9 some 12.x volts against pin 5 (ground).
- I can control the power output (Watts) by using a 5kohm poti when connected to the normally not used, open 2 pin socket, in the row of sockets where the externel sensor cable also goes to (see the 2nd picture from 12-31-2017, 12:10 AM, from rolands post, the black and red cable). Did not need to connect anything else to ground so.
- This control is possible only when the "Limit Mode" checkbox is NOT checked.
That is what I could confirm on my box.
Next step:
- Use a MCP4132 as Digi_Pot controlled by a Raspberry PI (I think I get this to work).
- For current meassuring I will use ACS758LCB-050B modules, where the analog (out2) signal is converted by a ADS1115 to I2C on the Raspberry.
Question: Did I overlook a translated version of the "Eybond Modbus RTU Protocol V100" document ? Since I did not yet get the RS232 interface to talk to me yet, so I assume I do something wrong. Does anyone know of a quick test (some confirmed string to send) for this interface?
Your help is greatly appreciated.