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1.绿联PL2303串口驱动下载

下载地址：https://www.lulian.cn/download/16-cn.html
也可以直接通过CSDN下载：https://download.csdn.net/download/Axugo/89447539

2.驱动安装

下载后解压找到Linux
然后可以看到如下：
执行如下命令：

uname -r

可以看到版本为4.15.0，然后进入到对应的绿联驱动文件目录下：

执行如下命令：

make all
sudo cp pl2303.ko /lib/modules/$(uname -r)/kernel/drivers/usb/serial

若命令执行失败可以参考https://blog.csdn.net/gsls200808/article/details/126466867
完成上述步骤后，编辑/etc/modules文件添加驱动名pl2303：

sudo gedit /etc/modules
#添加内容
pl2303
#保存

保存后重启Ubuntu服务器即可.

3.验证方法

那么怎么判断usb串口驱动是否正常呢？可以参考如下方法：
拔插RS232转USB线缆，然后执行如下命令：

dmesg

可以看到pl2303以及关于ttyUSB*串口的信息：

 881.004700] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
[  881.004749] pl2303 1-3:1.0: device disconnected
[  896.156007] usb 1-3: new full-speed USB device number 11 using xhci_hcd
[  896.304928] usb 1-3: New USB device found, idVendor=067b, idProduct=23a3
[  896.304934] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  896.304938] usb 1-3: Product: USB-Serial Controller 
[  896.304942] usb 1-3: Manufacturer: Prolific Technology Inc. 
[  896.304945] usb 1-3: SerialNumber: AHDKb132J02
[  896.305663] pl2303 1-3:1.0: pl2303 converter detected
[  896.305941] usb 1-3: pl2303 converter now attached to ttyUSB0
[  902.529545] usb 1-4.3: new full-speed USB device number 12 using xhci_hcd
[  902.750714] usb 1-4.3: New USB device found, idVendor=067b, idProduct=23a3
[  902.750721] usb 1-4.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  902.750725] usb 1-4.3: Product: USB-Serial Controller 
[  902.750729] usb 1-4.3: Manufacturer: Prolific Technology Inc. 
[  902.750732] usb 1-4.3: SerialNumber: DUCOb11A922
[  902.751571] pl2303 1-4.3:1.0: pl2303 converter detected
[  902.751896] usb 1-4.3: pl2303 converter now attached to ttyUSB1
[  911.191627] usb 1-2.4: new full-speed USB device number 13 using xhci_hcd
[  911.412863] usb 1-2.4: New USB device found, idVendor=067b, idProduct=23a3
[  911.412869] usb 1-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  911.412873] usb 1-2.4: Product: USB-Serial Controller 
[  911.412877] usb 1-2.4: Manufacturer: Prolific Technology Inc. 
[  911.412881] usb 1-2.4: SerialNumber: FLBGb11BS12
[  911.413721] pl2303 1-2.4:1.0: pl2303 converter detected
[  911.414038] usb 1-2.4: pl2303 converter now attached to ttyUSB2
[  921.139586] usb 1-2.4: USB disconnect, device number 13
[  921.139976] pl2303 ttyUSB2: pl2303 converter now disconnected from ttyUSB2
[  921.140053] pl2303 1-2.4:1.0: device disconnected
[  929.186353] usb 1-3: USB disconnect, device number 11
[  929.186738] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
[  929.186836] pl2303 1-3:1.0: device disconnected
[  936.249723] usb 1-4.3: USB disconnect, device number 12
[  936.250100] pl2303 ttyUSB1: pl2303 converter now disconnected from ttyUSB1
[  936.250178] pl2303 1-4.3:1.0: device disconnected