References

The TYNESS-OPT-MODBUS board is an additional ModBus interface board
enabled to communicate in master or slave mode.
In master mode, it enables to read the data of one or more sensors
communicating in ModBus so as to copy the Modbus tables to the internal
tables of the Tyness.
In slave mode, it is integrated into a ModBus network and provides the
master of the network with an internal table in the Tyness.