Installation preparation

The NODA Modbus Gateway comes prepared with all necessary certificates to connect to the NODA MQTT network securely.

Modbus TCP

For access to the Modbus TCP slave(s) or acting as a Modbus TCP slave itself. The NODA Modbus Gateway will need either a static or dynamic (DHCP) IP assigned to it in the LAN.

Don't hesitate to contact the network administrator as this information is only known to, and can be handled by, the network administrator. Once an IP number is assigned to the NODA Modbus Gateway, either via static or dynamic assignment, these details should be communicated to NODA, as they are required for device setup on the LAN.

NOTE: If the network administrator requests a MAC address. This address is labelled as LAN MAC on the underside of the NODA Modbus Gateway. If the label is missing or has been damaged, please get in touch with NODA for help.

Modbus RTU

To access Modbus RTU slave(s), the NODA Modbus Gateway will need access to an RS-485 network. Details on how an RS-485 network works are out of scope for this document.

To access Modbus RTU slave(s), the RS-485 bus configuration is required.

Default values are highlighted in bold.

• Baud rate (300, 1200, 2400, 4800, 9600, 19200, 38400, 57600 or 115200)
• Parity bits (none, odd, even)
• Stop bits (1, 2)
• Flow Control: (None, Xon/Xoff)
• Slave id or range of slave ids: (1-247)