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Hi Terrypacker, I would like to introduce you to scm which is an alternative library to rxtx/javaxcom. Wiki : http://www.embeddedunveiled.com/ Repository : https://github.com/RishiGupta12/serial-communication-manager Video : https://www.youtube.com/watch?v=fYLQbelGunQ It supports RS-232 control signals handshaking, monitoring and has been ported to Linux, MAC, Solaris and Windows operating system. It is consistent, portable, efficient, reliable, testable, extensible, modifiable, scalable library.

Hi, I found that using batch requests they are sent one next to each other, but not all devices like this behaviour: crappy devices prefer to have some delay between requests to not stress the CPU. Do you agree? Do you think that adding a programmable delay could be an improvement to Modbus4J?

All OK now, thank you!

You are correct.

Feel free to regenerate as required.