J2534 Passthru Interface
SD Connect is the Mercedes-Benz diagnostic multiplexer, the vehicle communication interface that links a laptop running Xentry/DAS to the car's OBD port. The C4 generation connects over USB, Wi-Fi or LAN and handles CAN, K-line and other Mercedes bus protocols; the newer C6 adds DoIP/Ethernet diagnostics for modern platforms and can also act as a passthru device. It buffers and routes diagnostic traffic so the PC software can read modules, flash ECUs and perform SCN online coding. Dealers and independent Mercedes specialists use SD Connect as the hardware bridge for the full Xentry/DAS toolchain. Without a compatible multiplexer — SD Connect or an approved passthru — Xentry cannot communicate with the vehicle at dealer level.
SD Connect is the hardware Mercedes software uses to reach the car; Softechpro is software that edits the extracted engine file (emissions/DTC-off, Stage, checksum) and does not replace this interface or the flashing hardware.
See Softechpro plansTry the file service