Here is what you lose without the official PDF:
: Monitors the pure water tank level (normally closed; opens when full) ФильтроМир roc-2015 controller manual pdf
The null-modem pinout. On page 3-12 (depending on revision), the manual shows that while the ROC-2015 uses a standard DB9 connector, it requires a null-modem cable (pins 2 and 3 crossed, pin 5 straight). A straight-through cable will never connect. Here is what you lose without the official