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Hi.

How to interrogate the device using this scheme   slave device (modbus RTU, RS485) → TRB245(WAN, port forwarding) → SCADA (modbus TCP) ?

please send step by step instructions

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Hi,

You'll need to use the function Modbus Serial Master and add the slave you want to manage.

https://wiki.teltonika-networks.com/view/TRB245_Modbus#Modbus_Serial_Master

Also, it's possible to create requests and create alarms for each parameter.

https://wiki.teltonika-networks.com/view/TRB245_Modbus#Requests_Configuration_2

Another interesting feature is the MQTT gateway, you can forward data from Modbus slave to server and viceversa via MQTT

https://wiki.teltonika-networks.com/view/TRB245_Modbus#MQTT_Gateway

Another related information.

https://wiki.teltonika-networks.com/view/TRB245_modbus_custom_register_block

RUT955 configuration examples. (You can check details from other devices due the services are the same)

https://wiki.teltonika-networks.com/view/Configuring_Modbus_TCP_Master

https://wiki.teltonika-networks.com/view/How_to_simulate_Modbus_serial_communication