@xuwei
All input and output gripper registers are described in the manual here. For example, the activated status of the gripper can be found in register 0. In Modbus TCP this register is at the address 0.
I suggest you using a Modbus library. There are free libraries on the web for a variety of programming software.
I have used the robotiq universal controller to control my finger-85 through modbus tcp.But i found i must "00 00 00 0D 00 10 00 00 00 03 06 09 00 00 FF FF FF" command to contorl it.So how can i get the status of my finger-85 by which address.