from the upper cover, it is shown as follow.
Firstly loosen the screws between upper cover and communication card and
removing the communication card like removing the plug, please use the
tools and remove it.
2.6.1 USB Interface
When the optional interface card is a stand-alone USB interface (IT-E1209) or
USB+LAN interface (IT-E1206), the following can help users quickly understand
the steps required to connect the USB interface.
The figure below shows a typical USB interface system.
Take the USB+LAN communication card box as an example. If you install
USB only, please refer to the actual interface position.
1. Refer to the USB connection diagram, connect the instrument and the
computer using a cable with two USB interfaces (each end).
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