Vaisala MMT330 - Manual (Page 136)

User's Guide _______________________________________________________________________
134 __________________________________________________________________ M210733EN-G
6. Use the SMODE command to enable the Modbus mode:
>
smode modbus
Serial mode : MODBUS
>
7. If necessary, use the SERI command to check and/or change the
serial interface settings for the User Port. For example, to set the
User Port serial settings to 19200 N 8 1, issue the following
command:
>
seri 19200 N 8 1
NOTE The number of data bits must always be 8 for Modbus RTU.
Serial Modbus interface of the MMT330 does not work with baud rates
115, 150, and 300 b/s.
8. Use the ADDR command to set the Modbus address of the
transmitter. For example, to set the Modbus address to 52, issue the
following command:
>addr 52
You must set a non-zero address or Modbus RTU will not work.
9. Modbus configuration is now complete. Reset or power cycle the
transmitter to enable the Modbus mode, and proceed with the
installation of the transmitter and the wiring of the serial interface.
Enabling Ethernet Modbus
In addition to enabling the Modbus protocol in the device, Modbus TCP
needs the following software settings: IP address, subnet mask, and
default gateway address. Also network name (SSID) and security settings
must be configured if wireless network is used.
Using Display/Keypad (Optional)
1. Open the Main Menu
by pressing any of the ▼▲◄► arrow
buttons.
2. Navigate to Interfaces
► Network Settings ► IP Configuration.
3. On the IP Configuration screen, set the network configuration
settings, and exit to save the changes.