CODEWITHSUNDEEP
c#.netserial-portrs485
NOFX
NOFX

Reputation: 41

Fast and reliable SerialPort

At the moment we use the .Net built-in SerialPort component to communicate with different sensors via RS485. This shows a latency of more than 10 ms between the arrival of the messages until the DataReceived event is triggered or SerialPort.ReadLine is terminated.

The connected sensors respond in < 1ms and the transmission takes 1 to 3 ms (2 or 3 MBaud/s). These can also be read out so quickly via a microcontroller.

Is it possible to accelerate this? Or are there useful 3rd party components which are in the range of less than 10 ms latency?

Upvotes: 3

Views: 899

Answers (1)

OKEEngine
OKEEngine

Reputation: 908

I just went through the source code, it doesn't seem the code is delaying the response.

https://referencesource.microsoft.com/#system/sys/system/io/ports/SerialPort.cs

However you can follow the article to change that in Device Manager and see if that works.

https://store.chipkin.com/articles/rs232-how-do-i-reduce-latency-on-com-ports

Edit

As the solution describes that you can go to your device manager and find your serial port from the list. There is a latency timer setting and you can updated that to 1 ms.

1 Start menu–> Settings –> Control panel –> device manager –> Ports (COM & LPT) –>{Select your USB to RS485 converter}

2 Right click and select “Properties”

3 Select the “Port Settings” tab

4 Click the “Advanced ” button 

5 Change the Latency Timer (mSec) to 1 or the lowest possible setting.

6 Change the USB Transfer sizes to 64 or the lowest possible settings.

7 Save and close.

Upvotes: 1

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