Dynasonics Fusion Water Flow Meter - Manual (Page 30)

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4. Press the  key to display adv tt on bottom display. Press
ENTER key. Press the  key to display yes on bottom display.
Press ENTER key.
5. At capture 0 display, press ENTER key. Press the  key to
display yes on bottom display. Press ENTER key.
6. If ERROR is displayed on bottom display, repeat step 5 until
successful.
7. Press the MENU key to exit.
TT SPAN—Transit Time Scale Factor
This function can be used to make the FUSION transit time flow
reading agree with a different or reference flow meter, or to
compensate for installation where there is inadequate straight
pipe to obtain a steady flow profile, by applying a correction
factor/multiplier to the readings and outputs. A factory calibrated
system should be set to 1.000. The range of settings for this
entry is 0.001 to 9.999. The following example describes using
the TT SPAN entry.
 The FUSION meter is indicating a flow rate that is 4% higher
than another meter located in the same pipe line. To make
the FUSION indicate the same flow rate as the other meter,
enter a TT SPAN of 0.960, to lower the readings by 4%.
MODBUS -- Modbus interface configuration
Modbus setup mode allows access to the following parameters.
Select YES to access these parameters.
BUS
ADDR - Modbus Address
BAUD RATE - Communications Baud Rate
BUS ADDR—Modbus Bus Address
This function is used to set the communication bus address for
the unit. An address of 0 will place the unit in a listen only mode
as this is reserved as a broadcast address for the host to use. An
address of 127 is a universal address. The unit will respond to
any address received except for address 0. Any other address
value will cause the unit to only respond to that address from the
host.