Moxa Technologies NPort 6110 - Manual (Page 30)

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4. Modbus ASCII Master mode works the same as Modbus/RTU Master mode,
except that the data format is Modbus/ASCII.
5. When the NPort Modbus Gateway receives a command from the serial port,
the ID No. range table is used identify which IP address to connect to (e.g., if
ID No. = 15, then according to the table in the Modbus Settings page shown
above, the command is sent to the device that has IP of 192.168.127.3.
Advanced Modbus Settings
The Advanced Modbus Settings page is used to set up the Auto Slave Unit ID,
Character Timeout, Message Timeout, and Modbus/TCP Exception.
NOTE To modify the settings on this page, you must first checkmark the
Change Modbus Settings box at the top of the Modbus Settings page.