下面介绍通过USS通讯MMx的设置方法，以MM3和MM4为例：


以MM3为例 参数设置方法：

1. Reset the drive to factory settings (optional). Press the P key: P000 is displayed. Press the up or down arrow key until the display shows the P944. Press P to enter the parameter. P944=1 2. Enable the read/write access to all parameters. Press the P key. Press the up or down arrow key until the display shows P009. Press P to enter the parameter. P009=3 3. Check motor settings for your drive. The settings will vary according to the motor(s) being used. Press the P key. Press the up or down arrow key until the display shows the motor setting for your drive. Press P to enter the parameter. P081=Nominal frequency of motor (Hz) P082=Nominal speed of motor (RPM) P083=Nominal current of motor (A) P084=Nominal voltage of motor (V) P085=Nominal power of motor (kW/HP) 4. Set the Local/Remote control mode. Press the P key. Press the up or down arrow key until the display shows P910. Press P to enter the parameter. P910=1 Remote control mode 5. Set the Baud Rate of the RS-485 serial interface. Press the P key. Press the up or down arrow key until P092 appears. Press P to enter the parameter. Press the up or down arrow key until the display shows the number that corresponds to the baud rate of your RS-485 serial interface. Press P to enter. P092 3 (1200 baud) 4 (2400 baud) 5 (4800 baud) 6 (9600 baud - default) 7 (19200 baud) 6. Enter the Slave address. Each drive (a maximum of 31) can be operated over the bus). Press the P key. Press the up or down arrow key until P091 appears. Press P to enter the parameter. Press the up or down arrow key until the display shows the slave address you want. Press P to enter. P091=0 through 31. 7. Ramp up time(s) (optional). This is the time in seconds that it takes the motor to accelerate to maximum frequency. Press the P key. Press the up or down arrow key until P002 appears. Press P to enter the parameter. Press the up or down arrow key until the display shows the ramp up time you want. Press P to enter. P002=0-650.00 8. Ramp down time(s) (optional). This is the time in seconds that it takes the motor to decelerate to a complete stop. Press the P key. Press the up or down arrow key until P003 appears. Press P to enter the parameter. Press the up or down arrow key until the display shows the ramp down time you want. Press P to enter. P003=0-650.00 9. Serial Link Timeout. This is the maximum permissible period between two incoming data telegrams. This feature is used to turn off the inverter in the event of a communications failure. Timing starts after a valid data telegram has been received. If a further data telegram is not received within the specified time period, the inverter will trip and display fault code F008. Setting the value to zero switches off the control. The time between the status polls to the drive can be calculated using Table 1–1. Press the P key. Press the up or down arrow key until P093 appears. Press P to enter the parameter. Press the up or down arrow key until the display shows the serial link timeout you want. Press P to enter. P093=0-240 (0 is default; time is in seconds) 10. Serial Link Nominal System Setpoint. This value can vary, but will typically correspond to 50 Hz or 60 Hz, which defines the corresponding 100% value for PVs or SPs. Press the P key. Press the up or down arrow key until P094 appears. Press P to enter the parameter. Press the up or down arrow key until the display shows the serial link nominal system setpoint you want. Press P to enter. P094=0-400.00 11. USS Compatibility (optional). Press the P key. Press the up or down arrow key until P095 appears. Press P to enter the parameter. Press the up or down arrow key until the display shows the number that corresponds to the USS compatibility you want. Press P to enter. P095 =