Does the "PMESWT0100" a modbus master or a modbus slave?

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The weighing module "PMESWT0100" is able to manage an HMI for monitoring / adjustment.
The HMI is connected to the "PMESWT0100" through a RS485 bus. The protocol which is used is Modbus.
The HMI is master on the RS485 bus and the "PMESWT0100" is slave. We adjust the slave address of the module through the DTM available in the software "UnityPro".