Library for Modbus ???

Hi, I have a project to control a motor system.
The communication is RS485 through Modbus via Serial.
The computer is the master and the control motor is the slave.
I have just one system to control

I found 3 free driver.

MODBUS Library for LabVIEW Version 1.21
http://www.ni.com/example/29756/en/

LabVIEW Modbus API v1.1.3.32

https://decibel.ni.com/content/docs/DOC-30140

MODBUS included in DSC module for LV2014
http://zone.ni.com/reference/en-XX/help/370622M-01/lvmve/choose_modbus_ioserver_vi/

I already made a development with 1.21 from NI.

Should it better to use Modbus library from DSC module ?
What do you suggest me ?

thanks in advance