Dataman 40Pro - Manual (Page 34)

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8) Power supply connector
9) LPT connector for PC
DATAMAN-48PRO2 communication cable. For
DATAMAN-48PRO2C after upgrade to DATAMAN-48PRO2
10) USB connector for PC DATAMAN-48PRO2 / DATAMAN-48PRO2C communication
cable
Connecting DATAMAN-48PRO2 /
DATAMAN-48PRO2C to the PC
Using USB port
In this case, order of connecting USB cable and power supply to programmer is irrelevant.