The DPI GUI allows communication to up to 4 POLs and 2 BUS converters. Enter the trim resistor value in Kohms at the top and select the Trim value in Volts. Then select “Write Settings” for the module to accept the new setting. If this is to become the new permanent setting of the module, select “Store Defaults”. That’s it. The digital trim is capable of 0.4% resolution.