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ljacklm requires the Exodriver library, which is the low-level USB library. That library provides an interface for USB communications to send and receive U12 command-responses (packets):
I recommended using the ljacklm library interface which handles the low-level command-response packets and USB communications. If you want to handle the low-level USB packets yourself, use the Exodriver directly.
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We provide a U12 high-level library, ljacklm, for the U12 with C/C++ examples here:
https://labjack.com/support/software/installers/u12/u12-mac-and-linux-lj...
ljacklm requires the Exodriver library, which is the low-level USB library. That library provides an interface for USB communications to send and receive U12 command-responses (packets):
https://labjack.com/support/software/installers/exodriver
Last, the U12 high-level functions and low-level command-response are documented in the U12 datasheet:
https://labjack.com/support/datasheets/u12
I recommended using the ljacklm library interface which handles the low-level command-response packets and USB communications. If you want to handle the low-level USB packets yourself, use the Exodriver directly.