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u-blox modules can implement more than one interface between the DTE and the DCE, either virtual interfaces (multiplexer channels) or physical interfaces (UART, USB, SPI, etc., when available). Each interface works as specified by the followings definitions. If not differently stated, all the subsequent descriptions are applicable to each interface. [anchor_Appendix_ATCommands_topic_5] describes the different behavior among the interfaces in reference to the AT command interface. It also describes the limitations (if any) in the concurrent use of more than one AT command interface.
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Error result codes from 2500 to 2999 are reserved for SARA-R4 / SARA-N4 series!!!!.