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TRB140 has both features of Modbus TCP slave(client) and Modbus TCP Master(server).
A Modbus TCP Slave listens for connections from a TCP master (client) and sends out a response or sets some system related parameter in accordance with the given query. This provides the user with the possibility to set or get system parameters.
A Modbus Master device can request data from Modbus slaves. The Modbus TCP Master section is used to configure Modbus TCP slaves.
Check the following link on how it can be configured https://wiki.teltonika-networks.com/view/TRB140_Modbus