What should I pay attention to when using sensor termination resistors? Sensor customers have a lot of confusion about some problems in the installation and use. We specially invite the technical experts who have been engaged in the sensor manufacturing R&D department for many years to make a few explanations on relevant important matters for the majority of sensor users: First, the signal output of the sensor is mainly divided into two types – analog signals: current, voltage; Digital signal: RS485. Second, the use of the terminal resistance of the user-side transceiver in the use of the sensor [precautions]: 1. The communication line of the sensor should be shielded twisted pair, and the shielding layer should be connected to the earth at a single point; No, twisted pair do not match a 120Ω termination resistor. 2. When there is no signal reflection problem, try not to use terminal resistance; This is because termination resistors generate significant power dissipation during fast communication. 3. When multiple 485 connections are transmitted remotely, reflections occur, and termination resistors need to be added, but the pull-up resistor matching should be carried out according to the number of 485 channels to prevent the termination matching resistor from pulling the voltage difference between AB low, less than the 485 communication threshold, and the phenomenon of failure to work normally. 4, 2-32 channel communication, no reflection, no termination resistor, the user-side transceiver can be connected to 3.9K-24K pull-up and down resistor (generally transceivers are in this range) 2-32 channel communication, there is reflection, connected to the termination resistor, it is recommended that the sensor user-side transceiver be connected to 500-750Ω pull-up and down resistor. Star Meter Technology Co., Ltd. is a high-tech enterprise integrating R&D, production and sales. Specializing in the production of pressure transmitters, liquid level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, 3051 transmitters and related instrumentation accessories. A number of products under the Xingyi brand have obtained a number of patent certificates issued by the state, such as CE certification, IS9001 certification, SGS certification, TüV SüD certification, explosion-proof certification, etc. Product consultation, product customization, agent, technical inquiry, quotation, etc. If you have any questions, please contact Xingyi: 400-600-4496!