6ES75325HD000AB0
6ES75325HD000AB0
6ES75325HD000AB0
6ES75325HD000AB0
當(dāng)作為RS-232口時(shí)與PC機(jī)的DB-9針RS-232口的2、3、5腳分配完全相同。作為RS-422時(shí)，T+、T—是指從USB232GL1向外發(fā)送。注意RS-485和RS-422通信時(shí)建議要接地線（5腳）。RS-485/422無須跳線選擇。RS-485/422信號的參考地線與RS-232的GND是一樣的。
DB-9針端的引腳分配如下：
1 2 3 5 6 8 9
RS-232 RXD TXD GND
RS-485 A GND B
RS-422 T+ GND R+ R— T—
波仕電子USB232GL1產(chǎn)品具有以下基本性能特點(diǎn)：光電隔離且無須外接電源，無須供電而且還可以對外輸出隔離的5V電源，串口為RS-232/RS-485/RS-422通用，自動(dòng)識別串口號。驅(qū)動(dòng)程序同波仕USB232、USB485轉(zhuǎn)換器。
第四代產(chǎn)品 USB/串口光纖轉(zhuǎn)換器
OPTU232L1圖4 波仕電子的型號為OPTU232L1的USB/串口光纖轉(zhuǎn)換器
第四代USB串口通信產(chǎn)品的型號是波仕電子的OPTU232L1（多模）和OPTU232SL1（單模）（如圖4）。直接從USB口轉(zhuǎn)換出一對光纖收發(fā)頭用于傳輸串口信號，而且無須供電。它們是最新一代USB光纖通信產(chǎn)品。波仕OPTU232L1和OPTU232SL1（單模）微型USB/串口光纖轉(zhuǎn)換器具有專利的外形(80*23*47mm)、可以虛擬成為本地COM串口(COM1-COM256)、無須修改已有的串口通信軟件。驅(qū)動(dòng)程序同波仕USB232GL1轉(zhuǎn)換器。由于OPTU232L1傳輸?shù)倪€是串口信號，所以必須成對使用或者與波仕的串口/光纖轉(zhuǎn)換器配對使用。由于采用光纖作為通信傳輸介質(zhì)，具有高隔離電壓、防電磁干擾、傳輸距離遠(yuǎn)等優(yōu)點(diǎn)。
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