Read more than 100 registers using modbus

Hello Everyone, 
 

I downloaded modbus library and try to use modbus ethernet query to communicate with PLC. I found modbus can only read about 100 register one command but I need to read way more than 100 registers and record the data to a spreadsheet and export the final result as a csv file. I am really new to this field and wondering how can this be done ?(my guess is using while loop?)