EL6001產(chǎn)品全新供應(yīng)

485收發(fā)器在規(guī)定的共模電壓-7V至+12V之間時(shí)，才能正常工作。如果超出此范圍會(huì)影響通訊，嚴(yán)重的會(huì)損壞通訊接口。共模干擾會(huì)增大上述共模電壓。共模干擾的有效手段之一是將485通訊線的屏蔽層用作地線，將機(jī)具、電腦等網(wǎng)絡(luò)中的設(shè)備地連接在一起，并由一點(diǎn)可靠地接入大地。

3、485通信線應(yīng)如何走線

通信線盡量遠(yuǎn)離高壓電線、日光燈等干擾源，通信線不能與電源線等干擾源避開(kāi)時(shí)通信線應(yīng)與電源線垂直，不能平行，更不能捆扎在一起，并采用質(zhì)量高的雙絞線走線。

4、、為什么485總線要采用手拉手結(jié)構(gòu)，而不能采用星形結(jié)構(gòu)？

星形結(jié)構(gòu)會(huì)產(chǎn)生反射信號(hào)，從而影響到485通信?？偩€到每個(gè)終端設(shè)備的分支線長(zhǎng)度應(yīng)盡量短，一般不要超出5米。分支線如果沒(méi)有接終端，會(huì)有反射信號(hào)，對(duì)通訊產(chǎn)生較強(qiáng)的干擾，應(yīng)將其去掉，好在RS485設(shè)備兩頭接有120Ω終端電阻。

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