Disclaimer: This is ONLY for educational purposes, No one is responsible for any type of damage. So be aware.
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Strip apart the IDU and find the 4 uart pins; usually marked on most models of IDU. Some models have pins already soldered onto the pads so you don't have to.
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Only connect Rx , Tx and GND ; do not connect 3.3v pin to your usb-to-ttl or whatever device you are using as a serial converter as it may fry your IDU.
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Install putty if you dont have a serial terminal already. use the configs below and connect the IDU to your serial converter.
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power on the IDU and see text starts flowing on your terminal. If you see garbled text then check your connections or try reversing the Rx Tx pins.
BaudRate: 115200
DataBits: 8
StopBits: 1
Parity: None
FlowControl: None
This has been tested on JIDU6801 and if you still encounter garbled text then maybe your model has a different baud rate; try using other common baud rates. Also your usb to ttl might be having issues so do check that.