Node-red Serial port output node, response time too long.

[lobotou]

I use node red "Serial port output" node to output a number to Arduino, but the response time is too long, about 500ms to 2s. I don't know if this is normal.

I send the number to arduino by Serial port, i hope that the arduino will response immediately. But when i click on the inject node or silder, the arduino did not response immediately, and after about 500ms to 2s, my arduino responsed and the led light up. I want to know why. Thanks!!!

Node-RED version:V3.1.3 node.js version: v20.11.0 npm version: 10.3.0 Platform/OS: window10 Browser: chrome 120.0.6099.225 Arduino :Uno R4

By the way. This is my arduino code, and i have tried to send the number to arduino by arduino IDE serial port, it is very quick that the led light up when i sent the number. So i think that is not arduino's problem.

[hardillb]

Please edit this to complete the template you were shown when opening the issue.

As it is we have no information about which node or what the problem is.

[hardillb]

Please Add all the information requested, not just the version numbers.

We need the following:

• a clear description of the problem
• what Node-RED and node version you are using
• How you have configured the node
• What hardware you have connected the serial device to
• It would be useful to have an example flow that shows the problem

[hardillb]

Please include details of how you have configured the serial port config node. Especially if you have included a value in the Add character to output messages section as I believe the arduino code you have provided will only work if a new line char is included in the output which will not be added by default, which will then lead to the default 1 second timeout on the serial.parseFloat() function.

Also should you be using serial.parseInt() as you appear to only be sending integers not floats.

[hardillb]

I will guess that when you use the arduino IDE it is including a new line character (and possibility a line feed) with each number you send.

[lobotou]

Please include details of how you have configured the serial port config node. Especially if you have included a value in the Add character to output messages section as I believe the arduino code you have provided will only work if a new line char is included in the output which will not be added by default, which will then lead to the default 1 second timeout on the serial.parseFloat() function.请提供有关如何配置串行端口配置节点的详细信息。特别是如果您在 Add character to output messages 部分中包含了一个值，因为我相信您提供的 arduino 代码只有在输出中包含新行字符（默认情况下不会添加）时才起作用，然后导致 serial.parseFloat() 函数默认 1 秒超时。

Also should you be using serial.parseInt() as you appear to only be sending integers not floats.您还应该使用 serial.parseInt() 因为您似乎只发送整数而不是浮点数。

Your judgment is correct. I apologize for making a basic mistake. I added "\ n" to "Add character to output messages" and have resolved this issue.