help with modbus master, single register 8bit write

[jaygrovr]

Hey guys, i have a project where i am trying to use an arduino mega, to connect over modbus rtu using serial port 1 or serial port 2 of the mega, 9600 baud to a client that is addressed as 1. The hex value of the register is 13. How can I just send this value repeatedly to my device.

I am running the latest version of modbusmaster, inside IDE 1.8.15

Can someone provide an example, this has to be super easy, but I am not seeing how to write this 8 bit value. The type is a uint8_t

Also does this library do the built in checksums for you?

Thanks again, sorry for the strange question. I have experience with modbus but only with something designed to communicate with it already.

ModbusMaster version

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