RESISTANCE ARRANGING SYSTEM AND METHOD BASED ON RS-485 NETWORK

摘要

A resistance arranging system and method based on a RS-485 network are disclosed. A detection packet is generated and a circuit loop is received, so that the detection packet is taken as a basis signal and the received detection packet through the circuit loop is taken as a comparison signal, and push-up, pull-down and terminal resistors are arranged by controlling the switch according to the basis signal and the comparison signal, whereby achieving in a technical efficacy of convenience of promoting the resistors arrangement.

主权项

1. A resistance arranging system based on a RS-485 network, comprising:
a resistor series, comprising a pull-down resistor, a first switch , a second switch , a terminal resistor, a third switch and a push-up resistor in series, wherein the first, second and third switches are electrically connected as a predetermined open-circuit; a packet generating module, generating a detection packet after receiving a trigger signal; a transmission module, transmitting the detection packet and receiving the detection packet by using a circuit loop; and a comparison module, taking the generated detection packet as a basis signal and taking the received detection packet by using the circuit loop as a comparison signal, wherein the first and third switches are electrically connected as a short-circuit state so as to activate the push-up and pull-down resistors when the comparison signal has a signal width distortion smaller or larger than that of the basis signal, and the second switch is electrically connected as a short-circuit so as to activate the terminal resistor when the comparison signal comprises a redundant reflection signal or the comparison signal has a signal width equating a predetermined range of signal width.