Modbus 485 Flow Control

[kanber]

Hi,

I should make modbus 485 comunication with device like that;

1- RTS enable

2- Tx Data

3- RTS disable (Delay 100-200msec)

4- Rx Data

these condition should do looping from 1 to 4 for communication. Is there any way to do that?

 

[AzeoTech]

You probably want to set the Comm port handshaking to Manual, then set RTS control to Toggle.  These parameters largely align with the Windows DCB structure for opening comm ports and you can read about it here if you want a lot of detail:

https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-dcb