Nokia M-Bus, Bosch C-Bus universal cable schematic pinout

9 pin D-SUB female connector layout
9 pin D-SUB female connector at the computer

Most common schematic of m-bus and c-bus
interface cable. Suitable for most Nokia (M-Bus) and Bosch 508, 509,
607, 608, 718, 738 (C-BUS) cell phones cable connector

This simplified M-Bus scheme should be used with most Nokia cell phones (i.e. Nokia 8210, 8850)

In some cases (for Bosh cell phones?, Nokia 3210) more complicated scheme should be usedBosh mobile cellular cable or data-cable

External power usually not needed, but may be used