single modbus read and write command

[Peter_Platzer]

Hi!

I wonder how I could do a single write and read on holding registers.
If I use PiCtory Modbus Master Setup and define a register the read is done all the time.
Looks like it is done every second due to config in extended data setup.

I have a device where I need to write flash values via modbus, so I want to only perform one write and only want to perform reads at defined times.

Thanks Peter

[dirk]

Hi Peter, unfortunately you can only implement cyclic Modbus queries with PiCtory. Why don't you try this?
https://pymodbustcp.readthedocs.io/en/s ... sters.html#

[Peter_Platzer]

Thanks!
This worked got it running.