VB controls ABB frequency converter. What are the positive and negative control words in MODBUS RTU format? Seek a detailed explanation.

ABB inverter startup control word is written from 47F to 4000 1 in hexadecimal. After startup, the given speed is written into MODBUS register address 40002. If it is a positive number, turn it forward, if it is a negative number, turn it backwards. Of course, you need to set the parameter 1 108. The minimum speed is negative, for example,-1500.

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