The RTU and TCP  drivers is based on the Synapse library. The aim is to provide drivers ModBus/TCP and ModBus/RTU (master and slave), running in a background thread.
Project alpha phase! Many features do not work yet. Many of the features require rewriting. Currently there are no ready-made documentation and good examples. All this will be over time.
This project is freeware and open source under modified BSD style license.
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    We solve our Modbus RTU needs, client but also slaves, with SuperCom Modbus library (see adontec.com). We have spend some time trying some Modbus libraries but at the end any Modbus software component should run stable, support multiple simultaneous connections and be well documented. The SuperCom library did that and the free technical support came handy.