Terminalresistance method: to improve the quality of the communication on the 485 + and 485 - of the last 485 devices with a termination resistor of 120 ohms.
This paper studies the method of auto balancing bridge to precisely measure inductance L, capacitance C, resistance R(namely LCR)by measuring the high and low terminal vector voltages.
Use this solution to the premise of the hydraulic imbalance is: accurate calculation of water system resistance, heat or air-conditioned terminal flow should not change.