你知道你正在應(yīng)用的RS-485硬件嗎？它或許正處于數(shù)據(jù)和通信錯(cuò)誤中。 EIA－485規(guī)格沒有規(guī)定用于控制驅(qū)動(dòng)器的方法，因此，許多選項(xiàng)已經(jīng)有所改進(jìn)。一旦通信完成，由于設(shè)備有一定的時(shí)間需求才可以停止RS-485網(wǎng)絡(luò)控制，所以許多方法都有明顯的數(shù)據(jù)損壞風(fēng)險(xiǎn)。 此白皮書評(píng)估了許多普通的RS驅(qū)動(dòng)器控制方法： 應(yīng)用編程控制——在視窗環(huán)境下 一次性使用——用一個(gè)回路激活信號(hào) 自動(dòng)驅(qū)動(dòng)器控制——軟件自動(dòng)識(shí)別命令進(jìn)行傳送 自動(dòng)化硬件授權(quán)——利用在板上的硬件電路來控制RS-485通信 內(nèi)容詳見http://www.surachana.com/publish/tech/application/2008/6/tech_3_16_9677.html [font=times]original text [/font] [font=times]Eliminate Risk of Contention and Data Corruption in RS-485 Communications [/font] [font=times][color=#708090]Do you know that the RS-485 hardware you‘re using could be putting you at risk of data corruption and communication errors? The EIA RS-485 specification does not stipulate the method for controlling the driver, therefore a number of options have evolved. Some methods have significant risk of data contention and corruption because of the time required for a device to relinquish control of the RS-485 network once communication is complete. This Sealevel white paper evaluates the most common RS-driver control methods: • Application Program Control - under windows environment • One-Shot - uses a circuit to activate the enable/deactivate signal • Automatic Driver Control - software automatically recognizes commands to transmit/disable • Automatic Hardware Enable - latest innovation using hardware circuitry on the board to control the RS-485 communications[/color][/font]