There are two types of wiring for the load cell: 4-wire and 6-wire. The wiring of the module or weighing transmitter is also available in 4-wire and 6-wire. To connect to 4-wire or 6-wire, you must first see what your hardware requirements are. The principle is: you can connect 6 lines without 4 lines, you must connect 4 lines to short.
The general sensor is six-wire. When connected to a four-wire system, the power cable (EXC-, EXC+) and the feedback cable (SEN-, SEN+) are shorted. SEN+ and SEN- are used to compensate for line resistance. SEN+ and EXC+ are pathways, and SEN- and EXC- are pathways.
The EXC+ and EXC- supply power to the load cell, but due to the line loss between the weigh module and the sensor, the voltage actually received by the sensor will be less than the supply voltage. Each load cell has a mV/V characteristic, and its output mV signal is closely related to the received voltage. SENS+ and SENS- are actually a high-impedance loop in the weighing module, which can actually weigh the module. The received voltage is fed back to the weighing module. Suppose the EXC+ and EXC- are 10V, the line loss is 0.5V, and the sensor is 2mV/V. In fact, the sensor output maximum signal is 19mV instead of 20mV. At this time, 19mV will be used as the maximum range inside the weighing module, provided that the sensor must feed back the actual voltage to the weighing module through the feedback loop. Shorten EXC+ and SENS+ on the weighing module, and short-circuit EXC- and SENS-, only when the distance between the sensor and the weighing module is close, and the voltage loss is very small, otherwise the measurement will have errors.
