串行端口 Linux 与 Windows [英] Serial Ports Linux vs Windows
问题描述
我在 Ubuntu 16 上的 pyserial 程序有问题.我正在尝试使用 pyserial 向硬件设备发送中断命令.我写了一个python脚本:
I am having issues with my pyserial program on Ubuntu 16. I am trying to send a break command to a hardware device using pyserial. I wrote a python script that:
- 设置端口/波特/奇偶校验/字节大小/...
- 打开端口
- 发送中断命令
- 读取设备的返回消息.
我在我的 Ubuntu 16.04 机器上运行脚本，我得到零响应，它只是挂起或最终超时.我将相同的脚本复制到我的 Windows 机器上，更改端口(从/dev/ttyUSB0 到 COM#)，我的脚本运行良好，立即得到设备的响应.
I run the script on my Ubuntu 16.04 machine and I get zero response, it just hangs or eventually timeouts. I copy the same script to my Windows machine, change the port (from /dev/ttyUSB0 to COM#) and my script works perfectly, gets a response from the device immediately.
当我在 Ubunutu 上运行脚本时，我必须授予端口权限 (sudo chmod 666/dev/ttyUSB)，否则在打开端口时我会收到权限被拒绝的错误.不确定这是否重要.
When I run the script on Ubunutu I have to give permissions to the port (sudo chmod 666 /dev/ttyUSB), or I get permission denied errors when opening the port. Not sure if this matters.
有没有人对可能发生的事情有任何见解?我知道 Windows 和 Linux 处理串行/com 端口的方式不同，但我是 Linux 和串行的新手，所以不确定我是否遗漏了什么.
Does anyone have any insight on what might be going on? I know Windows and Linux handle serial/com ports differently but I am a newbie to both Linux and serial so not sure if I am missing something.
我正在使用此 USB 转串口线 (http://www.ugreen.com.cn/product-681-en.html)，我不得不安装一些驱动程序.我连接了串行读/写引脚并进行了测试，以确保数据正在通过(确实如此)，所以我知道这是可行的.
I am using this USB to Serial cable (http://www.ugreen.com.cn/product-681-en.html) and I had to install some drivers. I connected the serial read/write pins and tested to make sure data is going through (which it is) so I know that works.
import serial
ser = serial.Serial()
ser.port = '/dev/ttyUSB0' # or COM12 on windows
ser.baudrate = 9600
ser.parity = serial.PARITY_NONE
ser.bytesize = serial.EIGHTBITS
ser.stopbits = serial.STOPBITS_ONE
ser.open()
ser.send_break(duration=0.9)
print(ser.read(10))
推荐答案
首先忘记您的应用程序并专注于端口故障排除，在串行模式下使用 putty 使用此端口发送一些终端字符.使用跳线将 DB9 针脚 3 连接到针脚 2(rx 和 tx)，以验证您是否收到了您键入的每个字符的回声.
First forget about your app and focus on the port troubleshooting, use putty in serial mode for sending a few terminal chars using this port. Use a jumper for conecting DB9 pin 3 to pin 2(rx and tx) an validate that you receive an echo of each character you type.
这篇关于串行端口 Linux 与 Windows的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
